23-NA-102

Bulletin No.:
Service Bulletin
Date:
23-NA-102
August, 2023
TECHNICAL
Subject:
Drivability Concerns, Hesitation, Transmission Shifting Rough/Harsh, Malfunction
Indicator Lamp (MIL) Illuminated - Multiple DTCs Set
Brand:
Model:
Cadillac
Chevrolet
Model Year:
Escalade
2023
2023
LM2
Silverado 1500 New (RPO J22,
VIN Digit 5 = A/D)
2022
2022
LM2
2024
LZ0
Silverado 1500
2023
Tahoe
Sierra 1500 - New
(RPO J22, VIN
Digit 5 = H/U)
Sierra 1500
Yukon Models
Involved Region or Country
Copyright 2023 General Motors LLC. All Rights Reserved.
2023
2023
2022
2023
from
SOP
to
Engine:
to
Suburban
GMC
Breakpoint Date:
from
JUNE
1, 2023
Transmission:
LM2
LM2
2022
LM2
2024
LZ0
2023
LM2
North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle East, Iraq, Israel,
Palestine, Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West),
Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay (West),
Venezuela (West), Other Central America, Japan, Cadillac Korea (South Korea), GM
Korea Company, China - SGM, Taiwan , Thailand (ASEAN), Singapore, Philippines,
Australia/New Zealand, Caribbean, Egypt, Other Africa, South Africa
Page 2
August, 2023
Bulletin No.: 23-NA-102
Some customers may comment on one or more of the following conditions:
1. Drivability concerns (engine performance)
2. Hesitation
3. Transmission shifting rough/harsh
4. MIL illuminated
Some technicians may find one or more of the following DTCs set:
Note: Additional DTCs may have been set. It was found that these were the most
common.
Condition
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
P1005
P31C3
P0700
U0073
U0074
P25A2
U1600
U0633
U0623
U02A9
U0285
U0284
P10C6
P2269
U0074
U0131
U029D
U029E
U059F
U18A2
Cause
This condition may be caused by one or more of the following:
• CAC pump electrical connector
• Active grill shutter electrical connector
• Engine wiring harness contacting the alternator bracket
• Loose ground at the front of the engine
Correction
Repair the wiring using SI procedures. Refer to Wire to Wire Repair in the Service Manual
or Ground Repair in the Service Manual.
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Service Procedure
Note: Using Woven Polyester Electrical Tape (PET),
tape all the contact points of the wiring harness
ensuring that the tape is applied in a double layer
extending along the harness past the splice sleeves.
Verify all straps are secured and retainers are installed.
Bulletin No.: 23-NA-102
August, 2023
Page 3
Information
Area of Concern at the CAC Pump Electrical
Connector
6219342
An open cavity or an unsealed pump connector
allowing water into the (M10) charge air cooler pump
electrical connector might be the root cause of the
communication failure.
– Check the CAC Pump connector sealing and look for
any corrosion at the pump due to water leakage.
DTCs that may be common with water intrusion the
electrical connector:
Note: U02A9 might be set with or without U1345 (LIN
BUS1 Failure).
•
•
•
•
•
•
•
•
•
Area of Concern Active Grille Air Shutter
Actuator In-line Connector
The following DTCs may be caused by the engine
wiring harness to active grille air shutter actuator in-line
connector (X618 on the pickup and X604A 0n the
SUV). Please check circuit 4621 which may be:
• Not properly connected
• Not properly held by the rear clip
• Grounded on the radiator
P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
P25A2 Brake System Control Module Requested
Malfunction Indicator Lamp Illumination
U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
U0623 Lost Communication with Heater
Coolant Pump
U0633 Lost Communication with Engine Cooling
Fan 2
U1345 Engine Control Module LIN Bus 1
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
6219339
Page 4
August, 2023
The graphic above shows how the proper connection
must be.
– Check the active grille air shutter actuator in-line
connector for not being properly connected or
grounded to the radiator.
DTCs may be caused by the active grill air shutter
wiring pinched at the radiator support.
6219340
The graphic above depicts where a pinching condition
may be located.
– Check the active grill air shutter wiring route to
identify possible damaged points in the wiring.
DTCs that may be common with the wiring harness
contacting the radiator or an improper connection:
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P25A2 Brake System Control Module Requested
Malfunction Indicator Lamp Illumination
• U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
• U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
• U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
• U0623 Lost Communication with Heater
Coolant Pump
• U0632 Lost Communication with Cooling Fan
Motor
• U0633 Lost Communication with Engine Cooling
Fan 2
• U1345 Engine Control Module LIN Bus 1
• U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
Bulletin No.: 23-NA-102
Bulletin No.: 23-NA-102
August, 2023
Page 5
LM2 Area of Concern at Alternator Bracket
6357536
– Arrows indicate location of retainer pins that were not
properly installed.
– Blue circle indicates where a chafe in the wiring has
occurred. The mis-installed bracket allowed the
harness to lay on the alternator.
6357529
Page 6
August, 2023
Bulletin No.: 23-NA-102
LM2 – Wiring Harness Contact at Alternator Bracket.
– The engine wire harness was chafed by a bracket
next to the back of the alternator.
U0073 CAN BUS 2 off or U0074 CAN BUS 3 off
6357546
LM2 – TCCM Wiring Harness Contact at A/C Line and
Bracket near Alternator.
LZ0 Area of Concern at Alternator Bracket
6367093
Bulletin No.: 23-NA-102
August, 2023
Page 7
6367095
6357562
LZ0 – The Wiring Harness Contacted the Alternator
Bracket do to Routing of the Harness.
Note: During the repair. It was noted that a 5/8 ths
diameter hose was used to prevent a reoccurring chafe
condition.
Page 8
August, 2023
Bulletin No.: 23-NA-102
6357567
This is CAN 3 wire harness. Can 4 is also in this bundle
only blue and yellow twisted with white.
LZ0 – Wiring Harness Contacting the A/C Line and
Alternator Bracket.
•
•
•
For both the LM2 and the LZ0, the DTCs that may be
common with the wiring harness contacting the A/C
line and alternator bracket:
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P10C6 Engine Diagnostic Status Signals
Message Counter Incorrect
• P1789 Current Transmission Range Unknown
• U0073 Control Module Communication CAN Bus
2 Off
• U0074 Control Module Communication CAN Bus
3 Off
• U0076 Control Module Communication Powertrain
Sensor CAN Bus Off
• U010E Lost Communication with Reductant
Control Module
• U0140 Lost Communication with Body Control
Module
• U0198 Lost Communication with Telematic
Control Module
• U029E Lost Communication with Nitrogen Oxides
Sensor 2
• U0402 Invalid Data Received from Transmission
Control Module
• U0403 Invalid Data Received from Transfer Case
Control Module
• U0404 Invalid Data Received from Gear Shift
Control Module
• U040F Invalid Data Received from Reductant
Control Module
• U0418 Invalid Data Received from Brake System
Control Module 1
• U0422 Invalid Data Received from Body Control
Module
•
•
•
•
•
•
•
•
•
•
•
•
U1009 Reductant Control Module CAN Bus 3 Off
U1345 Engine Control Module LIN Bus 1
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
U1609 Lost Communication with Serial Data
Gateway Module on CAN Bus 3
U1610 Lost Communication with Brake System
Control Module 1 on CAN Bus 2
U1643 Lost Communication with Transmission
Control Module on CAN Bus 2
U18D2 Lost Communication with Gear Shift
Control Module on Powertrain Sensor CAN Bus
U18D3 Lost Communication with Gear Shift
Control Module on CAN Bus 3
U2204 Serial Data Gateway Module Lost
Communication with Reductant Control Module
U220F Serial Data Gateway Module Lost
Communication with Transmission Control Module
U2212 Reductant Control Module Lost
Communication with Engine Control Module
U2405 Gear Shift Control Module Lost
Communication with Engine Control Module on
CAN Bus 2
U2419 Serial Data Gateway Module Lost
Communication with Brake System Control
Module 1 on CAN Bus 2
U241C Serial Data Gateway Module Lost
Communication with Engine Control Module on
CAN Bus 2
U241D Serial Data Gateway Module Lost
Communication with Engine Control Module on
CAN Bus 3
Bulletin No.: 23-NA-102
August, 2023
•
Loose Ground
•
•
•
•
•
•
•
•
•
•
6400093
Inspect ground connections G176A (1) and G177B (2)
may exist. Please check for any:
• Loosen condition
• Damaged or dirty threads
DTCs that may be common with a loose ground:
• P00EB Intake Air Temperature Sensor 3
Circuit High
• P0108 Manifold Absolute Pressure Sensor
Circuit High
• P045A Exhaust Gas Recirculation Valve 2 Control
Circuit
• P0494 Cooling Fan Speed Too Low — Left Side
• P0615 Starter Relay Control Circuit
• P0617 Starter Relay Control Circuit High Voltage
• P0628 Fuel Pump Control Circuit Low
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P1098 Fuel Rail Pressure Performance During
Deceleration Fuel Cut-Off
• P129F Fuel Pump Power Control Module Fuel
Pump Speed Signal Incorrect
• P12A6 Fuel Pump Power Control Module Enable
Circuit Performance
• P189C Transmission Range Command Message
Performance
• P2053 Reductant Injector 2 Control Circuit
• P305D DC/DC Converter Crank Input Signal
Circuit High Voltage
•
•
•
•
•
Page 9
P3187 Fuel Pump Pressure Performance - Low
Pressure
P31C3 Stop/Start System Performance
U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
U0585 Invalid Data Received from Active Grille Air
Shutter Actuator 1
U0586 Invalid Data Received from Active Grille Air
Shutter Actuator 2
U0623 Lost Communication with Heater
Coolant Pump
U0632 Lost Communication with Cooling Fan
Motor
U0633 Lost Communication with Engine Cooling
Fan 2
U0650 Lost Communication with Exhaust
Pressure Regulator Valve Position Sensor
U1345 Engine Control Module LIN Bus 1
U1346 Engine Control Module LIN Bus 2
U1347 Engine Control Module LIN Bus 3
U137E Invalid Data Received from Auxiliary
Coolant Pump
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
Parts Information
Causal
Part
Description
Part
Number
Qty
N/A
SPLICE,WIRE
(SALMON)
19300089
As Required
N/A
Woven Polyester
(PET)
Electrical Tape**
1985620
(USA)*
894.1230
(Canada)*
1
*There is enough material to service multiple vehicles. Store
the remaining material for future use.
**For USA, contact Wurth though website
www.wurthusa.com, by e-mail at
[email protected], or by calling 1-800987-8487.
For Canada, contact Wurth though their website at
www.wurth.ca/, by e-mail at [email protected], by calling 1800-263-5002 or your local Wurth rep.
Page 10
August, 2023
Bulletin No.: 23-NA-102
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation
Description
Labor Time
5486388*
Repair Wire Chafe on LM2 and LZ0 T1 LD SUV and LDPU
1.0 hr
Add
Additional Wire Repair (As Required)
0.2 hr
*This is a unique Labor Operation for Bulletin use only.
Version
5
Modified
Released June 12, 2023
Revised June 29, 2023 - Add Breakpoint Date of June 1, 2023.
Revised July 19, 2023 - Added the Additional Keywords section.
Revised August 01, 2023 — Added DTC’s and Loose Ground Section and Added 2024
Model Year for Silverado 1500 and Sierra 1500.
Revised August 17, 2023 – Update the Information in the Cause and Correction section,
Update Graphic in CAC Electrical Connector section, and Added Additional DTCs.
Additional Keywords: P0658, P0659, P2812, P2814,
P2815, P281B, P281D, P281E, P0960, P0962-P0964,
P0966-P0968, P0970, P0971, P2670, P2671, P2718,
P2720, P2721, P2727, P2729, P2730, P2736, P2738,
P2739, P2824, P2826, P2827, P0716, P0717, P07BF,
P07C0, P1783, P17CE, P0721-P0723, P077C, P077D,
P172A, P172B, P0707, P0708, P2802, P2803, P2805,
P0711, P0712, P0713, P176B-P176D, P178F, P17D3,
P17C5, P17C6, P17CC, P17CD, P17D6, P17F5,
P17F6, P17F7, P17FA, P17FB, P17FC, P18A2,
P18A3, P18A4, P27EB, P27ED, P27EE, P2796,
P2797, P2798, P2799, U1611
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.
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