08-07-30-021G

SB-10043829-6448
File in Section:
Service Bulletin
Bulletin No.:
Date:
07 - Transmission/Transaxle
08-07-30-021G
March, 2012
TECHNICAL
Subject:
Loss of High Speed GMLAN Communications, Intermittent No Crank, IP Gage
Fluctuation, Intermittent Door Lock Cycling, Intermittent Chime Operation, Various IP
Warning Lamps Illuminated, Transmission May Not Shift, Communication DTCs U0073,
U0100, U0101, U0102, U0109, U0121 or U0140 Set (Repair Terminals in Transmission
Harness Connector, Repair Open or Shorted GM High Speed LAN Circuits, Open or
Shorted Data Link Resistor, Corrosion or Poor Connections in Various Control Module
Connectors)
Models:
2007–2010 Cadillac XLR
2007–2012 Cadillac Escalade Models
2009–2012 Cadillac Escalade Hybrid
2007–2012 Chevrolet Avalanche, Corvette, Silverado, Suburban, Tahoe
2008–2012 Chevrolet Silverado Hybrid, Tahoe Hybrid
2007–2012 GMC Sierra, Yukon Models
2008–2012 GMC Sierra Hybrid, Yukon Hybrid
2008–2009 HUMMER H2
Equipped With Gasoline Engine and 6 Speed Automatic Transmission 6L80 (RPO MYC)
or 6L90 (RPO MYD)
Equipped With Hybrid Propulsion (RPO HP2) and Two Mode 2ML70 Automatic
Transmission
This bulletin is being revised to add the 2012 model year and additional Correction
information. Please discard Corporate Bulletin Number 08-07-30-021F
(Section 07 – Transmission/Transaxle).
Condition
Some customers may comment on any of the following
conditions:
• The malfunction indicator lamp (MIL) may be
illuminated.
• Instrument panel cluster (IPC) warning lamps may
illuminate.
• The transmission may not shift or defaults to
2nd gear.
• The door locks may cycle by themselves.
• The engine may not crank intermittently.
• A driver information center (DIC) message may be
displayed.
• The IPC gages may fluctuate.
• Applying the brakes may cause the IPC to
become erratic and the chimes to operate
simultaneously.
Copyright 2012 General Motors LLC. All Rights Reserved.
Depending on the vehicle and build, technicians may
find one or more, but not limited to the following, High
Speed GMLAN Communication DTCs set as Current or
History:
• P0700: Transmission Control Module (TCM)
Requested MIL Illumination.
• U0073: Control Module Communications
Bus OFF.
• U0100: Lost Communication With ECM/PCM.
• U0101: Lost Communication With Transmission
Control Module (TCM).
• U0102: Lost Communication with Transfer Case
Control Module (TCCM).
• U0109: Lost Communication With Fuel Pump
Control Module.
• U0121: Lost Communication With ABS Control
Module.
• U0140: Lost Communication With Body Control
Module (BCM).
• U186B: Lost Communication With TCM.
Page 2
•
•
•
•
•
•
March, 2012
U0129 : Lost Communication with Brake System
Control Module.
U186B: Lost Communication with TCM.
U0293: Lost Communication with HP2 Powertrain
Control Module.
U1862: Battery Energy Control Module Lost
Communication with Communications Gateway
Module.
U1886: Battery Energy Control Module Lost
Communication with Engine Control
Module (ECM).
U1888: Hybrid Powertrain Control Module Lost
Communication With Starter/Generator Control
Module.
Cause
These conditions may be caused by, but not limited to,
any of the following:
• Chafed, damaged, pinched, open or shorted
wiring.
• The terminal(s) for the High Speed GMLAN Serial
Data Bus has or have backed out of the 16-way
electrical connector to the automatic transmission.
• The terminal position assurance (TPA) lock in the
transmission 16-way electrical connector is not
fully seated.
• The High Speed GMLAN Serial Data Bus circuits
are open or shorted to ground.
• Corrosion in a control module connector.
• Intermittent or poor connections in the inline
connectors containing the High Speed GMLAN
Serial Data Bus circuits.
• Water intrusion in a control module connector.
Note: Model Year 2007 vehicles.
• The Terminator Resistor is open or shorted.
Note: Model Year 2008 Sierra and Silverado vehicles.
• The Data Link Resistor is open or shorted.
Note: Model Year 2009 and newer Sierra and
Silverado vehicles.
• The Data Link Resistor 1 is open or shorted.
Note: Model Year 2008 and newer Avalanche,
Escalade, Tahoe, Yukon vehicles.
• The Data Link Resistor 1 is open or shorted.
Note: Model Year 2008 and newer Hybrid RPO HP2
vehicles.
•
The Data Link Resistor 2 (RPO HP2) is open or
shorted.
Note: The following cause only pertains to hybrid
RPO HP2 vehicles equipped with OnStar® Delete
RPO UE0.
•
The High Speed GMLAN jumper harness loop
connector that plugs into the bottom rear of the
interior driver side junction block, is open or
shorted from chafing on the IP brace.
Bulletin No.: 08-07-30-021G
Correction
Do This
Don't Do This
Repair or replace any
backed out or damaged
transmission connector
terminal(s) as necessary.
Ensure that the transmission
connector TPA is fully
seated (TPA is centered in
check window).
Repair the High Speed
GMLAN Serial Data Bus
circuits that are open,
shorted to ground or have
poor connections.
Repair the corrosion or
water intrusion condition in
the affected module
connector.
Replace the Terminator
Resistor that is open or
shorted.
DO NOT replace any control
module, wiring harness or
component until you have
first isolated the cause of the
condition or followed this
procedure in its entirety.
Replace the Data Link
Resistor 1 or Data Link
Resistor 2 (RPO HP2
vehicles only) that is open or
shorted.
Repair the junction block
jumper harness loop
connector wiring that is open
or shorted. (RPO HP2
Vehicles equipped with
OnStar® Delete
RPO UE0 Only).
Information for the Procedures to
Diagnose and Repair the Above
Conditions
1. Perform the Diagnostic System Check-Vehicle
to begin your diagnosis.
2. Perform a thorough visual inspection of the
vehicle.
3. Depending on the vehicle and vehicle build,
some of the procedures may not be applicable.
4. The following procedure is the only one
applicable to the Corvette and XLR.
Chafed Wiring Harness at Transmission
Case Retaining Clip and Inspection of
the 16-way Electrical Connector for
Backed Out Terminals
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
Bulletin No.: 08-07-30-021G
March, 2012
2043302
Page 3
2807959
5. Before disconnecting the 16-way connector,
inspect for any backed out terminals (1) as shown.
Fully seated terminals (2,3) are shown for
comparison.
5.1. If a backed out terminal (1) is found, identify
the terminal(s) on the repair order.
5.2. Look at the connector in order to identify the
number of the cavity with the backed out
terminal. Refer to Wiring Systems and Power
Management > Component Locator > Master
Electrical Component List in SI.
2043303
3. Locate the 16-way electrical connector on the right
side of the automatic transmission as shown.
4. Inspect for chafed, damaged, pinched, open or
shorted wiring within the conduit of the harness
where it is secured at the transmission by a metal
attachment clip as shown. Inspect any wiring
harness where these metal attachment clips are
used on the vehicle as needed.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
conduit by covering any sharp edge with butyl
tape and the conduit and wiring harness with
woven polyester (PET) electrical tape. Secure
the harness as needed.
1921876
Note: For 2ML70 Only: Disconnect the 4WAL
electrical connector.
Page 4
March, 2012
6. Use the following procedure to disconnect the
16-way electrical connector:
6.1. Release and hold the slide lock on the wiring
harness connector.
6.2. Rotate the connector lever and remove the
connector from the component.
Bulletin No.: 08-07-30-021G
8. Repair or replace the terminal(s) as necessary
using the following procedure:
1921872
2807963
7. Inspect for any backed out terminals (3) as shown.
Fully seated terminals (1,2) are shown for
comparison.
7.1. If a backed out terminal (3) is found, identify
the terminal(s) on the repair order.
7.2. Look at the connector in order to identify the
number of the cavity with the backed out
terminal. Refer to Wiring Systems and Power
Management > Component Locator > Master
Electrical Component List in SI.
8.1. Locate the terminal position assurance (TPA)
as shown.
Note: The TPA cannot be removed from the connector
while there are terminals present in the connector body.
1921873
8.2. Use a small flat blade tool to push the TPA
until it bottoms out.
Bulletin No.: 08-07-30-021G
March, 2012
Page 5
13. Prior to installing the transmission connector,
perform the following steps to ensure that the TPA
lock is fully seated.
1921843
8.3. See the release tool cross reference in the
Reference Guide of the J-38125 to ensure
that the correct release tool is used. Use the
J-38125-28 tool to release the terminals by
inserting the tool into the terminal cavity as
shown.
8.4. While holding the removal tool in place,
gently pull the wire out of the back of the
connector.
Note: If the female terminal(s) must be replaced, it is
part number 22124472200. It is located in Yazaki tray
number 12 in the J-38125 Terminal Repair Kit.
2089334
Locate the TPA lock in the reassembled
transmission connector. Refer to the arrow in the
illustration above, which points to a TPA lock. This
one is in an unseated position. Using a small flat
blade tool, push to seat the TPA until it bottoms
out. Verify the TPA is fully seated.
8.5. Repair or replace the terminal(s) as needed.
Refer to the instructions in the J-38125
manual.
9. If the wiring is damaged, repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic Information
and Procedures in SI.
10. Slide the new terminal(s) into the correct cavity at
the back of the connector until it locks in place. The
new terminal(s) should be even with the other
terminal(s).
11. Ensure that each terminal is locked in place by
gently pulling on the wire.
Note: The male terminal(s) cannot be repaired as they
are an integral part of the transmission control
module (TCM).
12. Inspect for bent or misaligned terminal(s) in the
transmission half of the electrical connector.
⇒ If they are bent, use a suitable tool and apply
gentle pressure to straighten them. Indicate on
the repair order the terminal number that
was bent.
⇒ If they are damaged, replace the TCM. Refer to
Control Solenoid Valve and Transmission
Control Module Assembly Replacement in SI.
2089456
• If the TPA is off-center in the check window as
shown, then it is only partially seated. Note the
large gap at the arrow. Reseat the TPA lock and
ensure that it is fully seated.
Page 6
March, 2012
Bulletin No.: 08-07-30-021G
3. Remove the left side fuse block as shown.
2089400
• If the TPA lock is centered in the window as
shown, then it is fully seated. The gaps shown
by the arrows should be even on both sides.
Note: For 2ML70 Only: Connect the 4WAL electrical
connector.
14. Connect the 16-way electrical connector to the
transmission.
15. Lower the vehicle.
16. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
2077437
4. Inspect connector X1 (1) on the back of the fuse
block for a loose connection. Secure the connector
as needed.
5. Install the left side fuse block.
6. Connect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
7. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Inspection of Fuse Block - I/P (Left Side)
for Loose Connector X1
Chafed IP Wiring Harness Near Park
Brake Pedal Assembly
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to
Battery Disconnect Caution and Battery Negative
Cable Disconnection and Connection in SI.
The above condition may cause one or more of the
following fuses to open:
• 60A - MBEC1 (#72) (Underhood)
• 30A - AMP (#40) (Underhood)
• 15A - RDO (#41) (Underhood)
• 10A - IPC (#46) (Underhood)
• 15A - AIR BAG BATT (#51) (Underhood)
• 10A - DSM (Left side of IP)
386487
Bulletin No.: 08-07-30-021G
March, 2012
Page 7
Five areas of potential contact have been identified:
2002647
2002643
•
•
The IP wiring branch to C202 may have been
routed outboard of the junction block (left IP) and
the retaining clip (1) off the branch may not have
been fully seated. Possible point of contact (2).
The IP wiring branch to C202 may not have been
secured into place as the gray retaining clip (1) off
the branch was never seated.
2002648
2002646
•
The IP wiring branch to C202 may have been
pushed up and forward into the park brake
assembly and the retaining clip off the branch may
not have been fully seated. Possible points of
contact (1, 2).
•
The IP harness may be in hard contact with the
top rear edge (1) of the park brake assembly.
Page 8
March, 2012
Bulletin No.: 08-07-30-021G
2002649
2002644
When releasing the park brake pedal, the moving
part (1) at the end of the park brake release cable
may be coming into hard contact with the IP
harness.
If a condition is suspected or found with one of the
circuits running to C1 or C2 of the junction block or to
the inline IP-to-body connector C202 or at any of these
areas of concern then remove the front driver side door
sill plate, driver side body hinge pillar trim panel, left IP
outer trim cover and perform the following steps:
1. Turn OFF the ignition and all accessories.
2. Inspect the IP harness for chafed, damaged,
pinched, open or shorted wiring at the park brake
pedal assembly. Refer to the potential damage
points as shown in the photos - at the side and rear
of the park brake assembly. Be advised that
damage may be covered by electrical tape, or
turned away and hid from view.
3. Engage and release the park brake several times.
Observe the moving part at the end of the park
brake release cable as it may contact and damage
the IP harness. Inspect the IP harness at this
possible contact point. Note that any damage may
be covered by electrical tape and/or hid from view.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
harness by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape.
Engage and release the park brake several
times. Verify the harness is no longer making
contact with any sharp edge or point of the park
brake assembly. If it is still making contact,
route it away from the contact point and secure
it with tie straps.
Proceed to Step 4.
4. Inspect how the IP branch to C202 is routed. Route
the harness as necessary to match the correct
routing in the photo as shown. In order to route the
IP harness branch correctly (behind the junction
block-left I/P), remove the cover from the junction
block-left I/P and unseat the junction block from the
bracket.
5. Disconnect C202. Route the harness so that it lies
between the "goalposts" of the junction block
bracket. Seat the junction block to the bracket. The
harness will now be under the junction block.
6. Secure the harness by seating the grey offset
retaining clip to the dashmat (or brown "buddy clip"
if present - usually on SUV's only).
Reconnect C202.
7. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
•
Chafed IP Wiring Harness at Left Side
Junction Block Mounting Bracket
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
3. Remove the left side junction block. Refer to
Instrument Panel Electrical Center or Junction
Block Replacement - Left Side in SI.
4. Inspect for chafed, damaged, pinched, open or
shorted wiring at the mounting bracket.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
harness by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed.
5. Replace the left side junction block. Refer to
Instrument Panel Electrical Center or Junction
Block Replacement - Left Side in SI.
Bulletin No.: 08-07-30-021G
March, 2012
Page 9
6. Connect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
7. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Adjustable
Pedals Motor
1. Turn OFF the ignition and all accessories.
2434892
6. Lower the transmission sufficiently to provide
access to the engine wiring harness where it
routes from the engine intake manifold to the
transmission bell housing as shown.
7. Release the wiring harness conduit from the
retainers that secure it to the transmission and/or
transfer case.
2264518
2. Inspect for chafed, damaged, pinched, open or
shorted wiring at the adjustable pedals motor as
shown.
3. If the wiring is damaged, repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic Information
and Procedures in SI. Protect the conduit by
covering any sharp edge with butyl tape and the
harness with woven polyester (PET) electrical
tape. Secure the harness as needed.
4. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Transmission
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
3. Raise the vehicle. Refer to Lifting and Jacking the
Vehicle in SI.
4. Support the transmission with a transmission jack.
5. Remove the transmission support crossmember.
Refer to Transmission Support Crossmember
Replacement in SI.
2435124
Page 10
March, 2012
2435234
Bulletin No.: 08-07-30-021G
2808042
8. Examine the harness for wiring that may be
exposed outside of the conduit. Inspect all areas
for chafed, damaged, pinched, open or shorted
wiring as shown. If damage to the wiring is not
observed, then extract the wiring from the conduit
and inspect all remaining areas as needed.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures > Wiring Repairs in
SI. Protect the conduit by covering any sharp
edge with butyl tape and the harness with
woven polyester (PET) electrical tape. Secure
the harness as needed.
9. Raise the transmission as needed to install the
transmission support crossmember. Refer to
Transmission Support Crossmember Replacement
in SI.
10. Lower the vehicle.
11. Connect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
12. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
3. Locate the portion of the engine wiring harness
where it branches off from the intake manifold to
the ECM in the area shown (1).
Chafed ECM Wiring Harness From
Bracket Contact Near Engine Intake
Manifold
4. Inspect the wiring harness for damage from
contact with the steel bracket (1).
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures > Wiring Repairs
in SI.
5. Cover any sharp edge on the bracket with butyl
tape and the harness with woven polyester (PET)
electrical tape.
1. Turn OFF the ignition and all accessories.
2. Remove the upper intake manifold sight shield.
Refer to Upper Intake Manifold Sight Shield
Replacement in SI.
2808049
Bulletin No.: 08-07-30-021G
March, 2012
Page 11
2808054
6. Protect the wiring harness by adding additional
conduit (2) as shown. Tape the conduit to the
harness at both ends (1,3) to prevent movement.
7. Secure the harness to the bracket with a retaining
clip (4) as needed.
2808687
4. Gently release and slightly raise the wiring
harness (2) from the run channel (1) to allow
some slack in the harness.
Chafed Wiring Harness at Rear of
Engine Intake Manifold
1. Turn OFF the ignition and all accessories.
2. Remove the upper intake manifold sight shield.
Refer to Upper Intake Manifold Sight Shield
Replacement in SI.
2808134
5. Release the wiring harness conduit from the
retainers that secure it to the rear of the engine and
at the top of the transmission bell housing.
2808697
3. Remove the retaining plate (2) that covers the
wiring harness (1) on the top of the engine intake
manifold run channel.
Page 12
March, 2012
Bulletin No.: 08-07-30-021G
8. Secure the wiring harness within the conduit as
needed.
9. Attach the wiring harness conduit to the retainers
that secure it to the rear of the engine and at the
top of the transmission bell housing.
2328025
Note: The engine intake manifold is shown removed
to provide clarity.
6. Gently pull the wiring harness (2) up from the rear
of the engine (1).
2808687
10. Secure the wiring harness (2) within the engine
intake manifold run channel (1).
2328026
Inspect for chafed (1), damaged, pinched, open or
shorted wiring. If damage is not observed, then
extract the wiring from the conduit and inspect all
of the remaining areas as needed.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures.
7. Protect the conduit by covering any sharp edges
on the engine or transmission with butyl tape and
the harness with woven polyester (PET)
electrical tape.
2808712
⇒ If the vehicle has a small engine wiring harness
bundle, secure a portion of the harness within
some conduit (1) in the area that will be covered
by the retaining plate to prevent movement.
11. Tape both ends of the conduit (1) to the wiring
harness.
Bulletin No.: 08-07-30-021G
March, 2012
Page 13
any sharp edge with butyl tape and the harness
with woven polyester (PET) electrical tape. Secure
the harness as needed.
5. Lower the vehicle.
6. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
GMLAN Terminator Resistor 2007
Vehicles
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
Typical Location of Terminator Resistor (1)
Short Wheel Base Vehicle
2808697
12. Install and secure the retaining plate (2) over the
top of the wiring harness bundle (1).
13. Install the upper intake manifold sight shield.
14. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Chafed Wiring Harness at Chassis
Body Mounts Left Side Frame Rail
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
2653761
Typical Location of Terminator Resistor (1)
Long Wheel Base Vehicle - RPO NQZ
2268656
3. Inspect the wiring harness along the left side frame
rail at the body mounts as shown for chafed,
damaged, pinched, open or shorted wiring.
4. If the wiring is damaged, repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic Information
and Procedures. Protect the conduit by covering
2658551
Page 14
March, 2012
Typical Location of Terminator Resistor (1)
Long Wheel Base Vehicle - Except RPO NQZ
2658600
Note: RPO NQZ Without Auxiliary Fuel Tank.
3. On the vehicle being serviced, observe the location
of the terminator resistor. Inspect the wiring
harness leading to the terminator resistor, for
chafed, damaged, pinched, open or shorted wiring.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed.
⇒ If the wiring is not damaged, proceed to Step 4.
4. Disconnect the electrical connector from the
terminator resistor.
5. Test the terminator resistor for 110–130Ω.
⇒ If the resistance is not within the specified
range, replace the terminator resistor and
proceed to Step 6.
⇒ If the resistance is within the specified range,
connect the electrical connector to the
terminator resistor. Refer to Power and Signal
Distribution > Data Communications > Scan
Tool Does Not Communicate with High Speed
GMLAN Device OR Diagnostic Trouble Code
(DTC) List - Vehicle in SI.
6. Connect the electrical connector to the terminator
resistor. Secure the terminator resistor as needed.
7. Lower the vehicle.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Data Link Resistor 1 2009 Vehicles
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
Bulletin No.: 08-07-30-021G
Typical Location of Data Link Resistor 1 (1)
Short and Long Wheel Base Vehicles
2658245
Typical Location of Data Link Resistor 1 (1)
Long Wheel Base HD Vehicles
2658490
3. On the vehicle being serviced, observe the location
of the data link resistor 1 (1). Inspect the wiring
harness leading to the data link resistor 1, for
chafed, damaged, pinched, open or shorted wiring.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed.
⇒ If damage is not found, proceed to Step 4.
4. Disconnect the electrical connector from the data
link resistor 1.
Bulletin No.: 08-07-30-021G
March, 2012
Page 15
5. Test the Data Link Resistor 1 for 110–130Ω.
⇒ If the resistance is not within the specified
range, replace the data link resistor 1 and
proceed to Step 6.
⇒ If the resistance is within the specified range,
connect the electrical connector to the data link
resistor 1. Refer to Power and Signal
Distribution > Data Communications > Scan
Tool Does Not Communicate with High Speed
GMLAN Device OR Diagnostic Trouble Code
(DTC) List - Vehicle in SI.
6. Connect the electrical connector to the data link
resistor 1. Secure the data link resistor 1 as
needed.
7. Lower the vehicle.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Rear Chassis Mounted Data Link
Resistor 1 Chafed Wiring Harness
Causing Intermittent No/Crank and/or
Scan Tool Does Not Communicate with
High Speed GMLAN Device
1. Turn OFF the ignition and all accessories.
2. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
2651339
3. Typical location of a data link resistor 1 (1)
mounted on the rear of the chassis.
1991762
4. Inspect the wiring harness leading to the rear data
link resistor 1, between the truck box and frame for
chafed, damaged, pinched, open or shorted wiring
as shown.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 9.
⇒ If the wiring is not damaged, proceed to Step 5.
5. Disconnect the electrical connector from the data
link resistor 1.
6. Test the data link resistor 1 for 110–130Ω.
⇒ If the resistance is not within the specified
range, replace the data link resistor 1 and
proceed to Step 7.
⇒ If the resistance is within the specified range,
connect the electrical connector to the data link
resistor 1. Refer to Power and Signal
Distribution > Data Communications > Scan
Tool Does Not Communicate with High Speed
GMLAN Device OR Diagnostic Trouble Code
(DTC) List - Vehicle in SI.
7. Connect the electrical connector to the data link
resistor 1. Secure the resistor as needed.
8. Protect the conduit by covering any sharp edge
with butyl tape and the harness with woven
polyester (PET) electrical tape. Secure the harness
as needed.
9. Lower the vehicle.
10. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Page 16
March, 2012
Bulletin No.: 08-07-30-021G
Inspection of Engine Harness
Connector X109 for Backed Out or Bent
Terminals and Poor Connections
Inspection of Engine Harness
Connector X115 for Backed Out or Bent
Terminals and Poor Connections
1. Turn OFF the ignition and all accessories.
2. Locate the X109 connector. Refer to Wiring
Systems and Power Management > Component
Locator > Master Electrical Component List > X109
in SI.
1. Turn OFF the ignition and all accessories.
2. Locate the X115 connector. Refer to Wiring
Systems and Power Management > Component
Locator > Master Electrical Component List > X115
in SI.
3. Inspect the connector for the following conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal fit (use the correct test probe)
⇒ If a condition is found, repair as needed. Refer
to Wiring Systems and Power Management >
Diagnostic Information and Procedures in SI.
AND
⇒ If corrosion is found, proceed to the section of
the bulletin titled: Repairing Fretting
Corrosion to complete the repair.
4. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
2264519
3. Before disconnecting, verify the connector is fully
seated together even though the lever is locked
down as shown.
If the connector is not fully seated, repair as
needed. Refer to Power and Signal Distribution >
Wiring Systems and Power Management >
Diagnostic Information and Procedures >
Connector Repairs in SI.
4. Inspect the connector for the following conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal tension (use the correct test
probe)
⇒ If a condition is found, repair as needed. Refer
to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI.
AND
⇒ If corrosion is found, proceed to the section of
the bulletin titled: Repairing Fretting
Corrosion to complete the repair.
5. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Hybrid Models (HP2) Chafed Wiring
Harness Locations and Inspection of
Engine Harness Connector X150 for
Backed Out Terminals and/or Poor
Connections at Ground Locations G102
and G300
1. Turn OFF the ignition and all accessories.
2. Locate the X150 connector. Refer to Wiring
Systems and Power Management > Component
Locator > Master Electrical Component List > X150
in SI.
3. Inspect the connector for the following conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal fit (use the correct test probe)
⇒ If a condition is found, repair as needed. Refer
to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI.
AND
⇒ If corrosion is found, proceed to the section of
this bulletin titled: Repairing Fretting
Corrosion to complete the repair.
⇒ If a condition or corrosion is not found, proceed
to Step 4.
Bulletin No.: 08-07-30-021G
March, 2012
2297689
4. Inspect for a misrouted harness having chafed,
damaged, pinched, open or shorted wiring from
rubbing on the cooling fins of the Transmission
Auxiliary Fluid Pump Control Module as shown.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 8.
⇒ If the wiring is not damaged, proceed to Step 5.
2305639
Page 17
5. Inspect for chafed, damaged, pinched or shorted
wiring caused by a mispositioned harness retaining
clip as shown. This condition usually occurs when
the tab of the clip is aligned with a slot in the
conduit.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 8.
⇒ If the wiring is not damaged, proceed to Step 6.
6. Locate ground connections G102 and G300. Refer
to Wiring Systems and Power Management >
Component Locator > Master Electrical
Component List > G102 and G300 in SI.
7. Inspect G102 and G300 for a clean and tight
connection. Undercoating or corrosion may be
present between the eyelet and the frame resulting
in a poor connection.
⇒ If a poor connection or undercoating is found,
clean the area and repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic
Information and Procedures in SI.
Proceed to Step 8.
⇒ If corrosion is found, clean the area and repair
as needed. Refer to Power and Signal
Distribution > Wiring Systems and Power
Management > Diagnostic Information and
Procedures in SI. Proceed to the section of this
bulletin titled: Repairing Fretting Corrosion to
complete the repair.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Page 18
March, 2012
Hybrid Models (RPO HP2) Data Link
Resistor 2
Bulletin No.: 08-07-30-021G
Hybrid Models (HP2) Equipped With
OnStar® Delete RPO UE0 — IP Junction
Block Jumper Harness Loop Connector
Chafed Wiring
1. Turn OFF the ignition and all accessories.
Various Symptoms and/or Powertrain and
Communication DTCs Set
The following is a list of some of the DTCs that may be
set and is not all inclusive: C0242, P0700, P0AC4,
U0293, U0100, U0109, U0129, U0140, U1862, U186B,
U1886 or U1888.
1. Turn OFF the ignition and all accessories.
2. Disconnect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
2652658
2. Inspect the harness leading to the data link
resistor 2 (1) for chafed, damaged, pinched, open
or shorted wiring. Refer to Power and Signal
Distribution > Data Communications > Schematic
and Routing Diagrams > Data Communication
Schematics.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures. Protect the
conduit by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the harness as
needed.
⇒ If the wiring is not damaged, proceed to Step 3.
3. Disconnect the electrical connector from the data
link resistor 2.
4. Test the data link resistor 2 for 110–130Ω.
⇒ If the resistance is not within the specified
range, replace the data link resistor 2 and
proceed to Step 5.
⇒ If the resistance is within the specified range,
connect the electrical connector to the
terminator resistor. Refer to Power and Signal
Distribution > Data Communications > Scan
Tool Does Not Communicate with High Speed
GMLAN Device OR Diagnostic Trouble Code
(DTC) List - Vehicle in SI.
5. Connect the electrical connector to the data link
resistor 2. Secure the resistor as needed.
6. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
2658675
3. Locate the junction block (1) on the driver side of
the vehicle under the instrument panel (IP).
2658705
Bulletin No.: 08-07-30-021G
March, 2012
4. Locate the jumper harness loop connector that
plugs into the bottom back of the junction block.
Page 19
Lost Communication with Various
Control Modules and DTCs Set
DTC Descriptors
Note: Depending on the vehicle and vehicle build
there may be other DTCs set by other modules.
•
•
•
•
•
•
1.
2658869
5. Inspect the jumper harness loop connector (1) for
chafed (2), damaged, pinched, open or shorted
wiring from contact with the IP brace.
⇒ If the wiring is damaged, repair as needed.
Refer to Power and Signal Distribution > Wiring
Systems and Power Management > Diagnostic
Information and Procedures in SI. Protect the
harness by covering any sharp edge with butyl
tape and the harness with woven polyester
(PET) electrical tape. Secure the jumper
harness loop connector as needed. Proceed to
Step 6.
⇒ If the wiring is not repairable, replace the
P/N 15127940 jumper harness loop connector.
Protect the connector by covering any sharp
edge with butyl tape and the jumper harness
loop connector wiring with woven polyester
(PET) electrical tape. Secure the harness as
needed. Proceed to Step 6.
6. Secure the junction block as needed.
7. Connect the negative battery cable. Refer to
Battery Negative Cable Disconnection and
Connection in SI.
8. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
2.
3.
4.
⇒
⇒
5.
6.
DTC U0073 Control Module Communication
Bus A Off
DTC U0100 Lost Communication with Engine/
Powertrain Control Module (ECM/PCM)
DTC U0101 Lost Communication with
Transmission Control Module (TCM)
DTC U0102 Lost Communication with Transfer
Case Control Module
DTC U0121 Lost Communication with Electronic
Brake Control Module (EBCM)
DTC U0140 Lost Communication with Body
Control Module (BCM)
Connect a scan tool and perform the Diagnostic
System Check – Vehicle. Retrieve and record any
DTCs, Current or in History from all of the control
modules.
If any DTC(s) are set, refer to Diagnostic Trouble
Code (DTC) List – Vehicle to identify the
connector(s) of the control module/component
which may be causing the condition.
Turn OFF the ignition and all accessories.
Disconnect the connector(s) at the affected
module.
Inspect the connector(s) for the following
conditions:
• Backed out terminals
• Bent pins
• Corrosion
• Poor terminal tension. Use the correct test
probe.
• Water intrusion
If a condition is found, repair as needed. Refer to
Power and Signal Distribution > Wiring Systems
and Power Management > Diagnostic Information
and Procedures in SI.
Proceed to Step 5.
If corrosion or water intrusion is found, proceed to
the section of this bulletin titled: Repairing Fretting
Corrosion to complete the repair.
Reconnect the connector at the affected module.
Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Page 20
March, 2012
Inspection of Electronic Suspension
Control (ESC) Module Connector for
Missing Weather Plugs in Not Used
Cavities (RPO Z55 or G69)
1. Turn OFF the ignition and all accessories.
Typical Location of ESC Module
Bulletin No.: 08-07-30-021G
Electrical Component List > Electronic Suspension
Control (ESC) Module > Connector End View for a
list of cavities that are: Not Used.
⇒ If a weather plug is missing from any Not Used
cavity, repair as needed.
5. Install the connector (2) to the ESC module (1).
6. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
Repairing Fretting Corrosion
Note: Fretting corrosion looks like little dark smudges
on the electrical terminals and appear where the actual
electrical contact is being made. In less severe cases it
may be unable to be seen or identified without the use
of a magnifying glass.
1. If water intrusion is observed in the connector, use
pressure regulated compressed air to dry it out.
2664329
2. Locate the ESC module (1).
3. Disconnect the connector (2) at the ESC
module (1).
Typical View of Missing Weather Plug
2214281
2664512
4. Inspect the connector of the ESC module for
weather plugs that are missing from: Not Used
cavities (1). Refer to > Power and Signal
Distribution > Wiring Systems and Power
Management > Component Locator > Master
2. DO NOT apply an excessive amount of dielectric
lubricant as shown, to the connectors as hydrolock
may result when attempting to mate the
connectors. This could cause terminals to back
out, resulting in an intermittent connection.
Important: Use ONLY a clean nylon brush that is
DEDICATED to the repair of this specific condition.
Using a one-inch or smaller nylon bristle brush,
apply dielectric lubricant P/N 12377900 (in Canada
P/N 10953529) to both the module or component
side and the harness side of the affected
connectors.
3. Reconnect the affected connector(s) and wipe
away any excess lubricant that may be present.
4. If needed, connect the negative battery cable.
Refer to Battery Negative Cable Disconnection and
Connection in SI.
5. Clear any DTCs that may be present with a scan
tool and verify the proper operation of the vehicle.
OnStar is a registered trademark of the OnStar
Corporation.
Bulletin No.: 08-07-30-021G
March, 2012
Parts Information
Labor
Operation
Description
J-38125 Terminal Repair
Kit, Yazaki Tray Number 12
- Female Terminal
—
N6629
(MY2009
and Prior)
Wiring and/or
Connector-Transmission –
Repair or Replace
RESISTOR - DATA LINK
—
N6616
MY2009
and Prior
Serial DATA/DLC/STAR
Connector Wiring and/or
Connector Repair or
Replacement
N6620
(MY2009
and Prior)
Power and Grounds
Distribution Wiring and/or
Connector Repair or
Replacement
N6650
(MY2010
and Newer)
Terminal Replacement
N6653
(MY2010
and Newer)
Wire to Wire Repair
N6654
(MY2010
and Newer)
Connector Reconnection
N6656
(MY2010
and Newer)
Ground Stud or Nut Repair or
Replacement
N1736
Block Assembly, Wiring
Harness Junction - Left Body
and Instrument Panel Replace
N9613*
Lubricate Body Control Module
(BCM) Connector With
Dielectric Lubricant
J7729*
Lubricate Engine Control
Module (ECM) Connector With
Dielectric Lubricant
K9534*
Lubricate Transmission Control
Module (TCM) Connector With
Dielectric Lubricant
H9740*
Lubricate Electronic Brake
Control Module (EBCM)
Connector With Dielectric
Lubricant
N9612*
Lubricate “Other” Connector
With Dielectric Lubricant**
N9544*
Repair and Reroute IP Wire
Harness Near Park Brake
Description
22124472200
88988999
-
For vehicles repaired under warranty, use:
Material
Allowance
Part Number
12377900
(in Canada,
10953529)
Page 21
Dielectric Lubricant
(50 gram tube)
Woven Polyester (PET)
Electrical Tape
$11.56
(USD)
($2.90 per
repair)
$17.35
(CDN)
($4.35 per
repair)
$22.72
($3.00 per
repair)
Warranty Information
For transmission electrical repairs please note in the
technicians comments field on the repair order which
terminal number(s) were repaired or replaced. Also if a
male terminal is bent (transmission side of connector),
then indicate the bent terminal number on the repair
order.
Labor
Time
Use
Published
Labor
Operation
Time
0.1-0.3 hr
0.8 hr
*This is a unique labor operation for bulletin use only. It will
not be published in the Labor Time Guide.
**You Must Document the Affected Connector on the Repair
Order.
Note: Any additional time for component R&R to gain
access or for repair time greater than 0.3 hr must be
submitted as Other Labor Hours and requires appropriate
authorization and service management approval.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION