090730012F

File in Section:
Service Bulletin
07 - Transmission/Transaxle
Bulletin No.:
09-07-30-012F
Date:
October, 2012
TECHNICAL
Subject:
No Reverse, 3rd or 5th, Check Engine Light Illuminated, DTC P0776
(Replace 3-5 Reverse Clutch Plate (Waved)
Models:
2008-2009 Buick Enclave
2008-2009 Chevrolet Equinox, Malibu
2009 Chevrolet Traverse
2007-2009 GMC Acadia
2007-2009 Pontiac G6
2008-2009 Pontiac Torrent
2007-2009 Saturn AURA, OUTLOOK
2008-2009 Saturn VUE
All Equipped with 6T70/75 6-Speed Automatic Transmission
(RPOs MH2, MH4, MH6 or MY9)
This bulletin is being revised to update the Warranty Information. Please discard Corporate
Bulletin Number 09-07-30-012E (Section 07 – Transmission/Transaxle).
Condition
Cause
Some customers may comment about an SES light
and/or no reverse and may also comment on a slip/flare
or harsh shifts in drive range 3rd and/or 5th gear. Upon
investigation, the technician may find DTC P0776
(Clutch Pressure Control (PC) Solenoid 2 - Stuck Off)
set. Any one of the following codes may set
independent of each other as a result of this wave plate
breaking: P0777, P2723, P0717, P0716, P2715,
P2714.
This condition may be caused by a broken 35R clutch
wave plate allowing the apply piston to over-stroke the
piston to leak and causing loss of apply. This normally
will not occur before approximately 32,000 km
(20,000 mi). Debris generated by the condition can
affect the operation of the speed sensors and other
clutches.
Copyright 2012 General Motors LLC. All Rights Reserved.
Page 2
October, 2012
Correction
Important: It is recommended that a new plate be
installed any time the transmission is disassembled for
any reason.
Bulletin No.: 09-07-30-012F
Important: The control solenoid (w/body and TCM)
valve assembly should not be washed in a parts
cleaner. The control solenoid (w/body and TCM) valve
assembly should not be replaced for any DTC unless SI
diagnostics for the DTC have been completed and
instruct to replace the part.
1725874
Bulletin No.: 09-07-30-012F
October, 2012
Page 3
1725882
Important: Debris generated by the condition must be
cleaned from the entire transmission and the pump fluid
filter (201) and the control solenoid filter plate (16) must
be replaced. Failure to separate the case halves,
disassemble the transmission, clean the debris and
replace the pump fluid filter (201) and the control
solenoid filter plate (16) could lead to repeat
transmission damage and repairs.
Page 4
October, 2012
2584818
A new 3-5 reverse clutch plate (WAVED),
P/N 24254103 (423), has been released to address
this condition. Refer to SI for the appropriate repair
instructions.
A broken 35R wave plate can generate varying
amounts of debris inside the transmission. In most
cases this debris has not passed through the pump
fluid filter (201) damaging the pump, valve bodies or
torque converter. This debris can be cleaned and the
transmission successfully repaired.
In summary the following steps should be taken:
1. After removing the transmission from the vehicle,
remove the case cover assembly (35). Inspect the
case cover for damage. This part is serviced and
can be replaced if it is damaged.
2. Remove the 35R/456 clutch housing assembly
(422) and inspect it for a broken 35R wave
plate (423).
3. Inspect the case (21) for damage caused by a
broken wave plate as shown below.
Bulletin No.: 09-07-30-012F
2753502
• The snap ring groove, which is well below the
3-5-R wave plate area, is unlikely to be
damaged. It should still be checked to verify
the snap ring is fully seated and to be securely
retained.
2753503
• Peening or wear of the face or edge of the case
lugs that engage the steel clutch plates is
normal and not cause for transmission
replacement.
2753500
Bulletin No.: 09-07-30-012F
October, 2012
Page 5
Cleaning and Inspection for the pump. Refer to
SI procedure Torque Converter Diagnosis for the
section Torque Converter Replacement Guide.
– Fine metal particles that you cannot feel (traces
of metal flakes/gray color to the fluid) are not
reasons to replace the torque converter.
– Metal chips/debris that you can feel or that are
found in the converter, or when flushing the
cooler and cooler lines, indicate the torque
converter should be replaced.
2753506
2739303
Note: The manufacturing process of the torque
converter can cause the hub side to appear blue or
darker in color while the lug side is a natural metal
color. If the torque converter appearance is like this and
no other reason is observed per the SI procedure for
torque converter diagnosis, then the torque converter
does not need to be replaced.
2753509
• Some degradation of the shelf for the
2-6 backing plate is acceptable as long as the
plate can lie flat. A raised burr that prevents this
can be removed using a de-burring tool, file or
some other abrasive.
4. Remove the control valve body cover (1), control
solenoid (w/body and TCM) valve assembly (15)
and filter plate assembly (16).
5. Inspect the filter plate assembly (16) for the
presence of metallic debris on the screens.
– If there is no debris on the screens, the pump
fluid filter was effective and there is no debris in
the pump or torque converter. Therefore the
pump, torque converter and valve body do not
need to be replaced. The transmission should be
repaired.
– If there is debris on the screens, the pump and
torque converter should be inspected further.
Refer to SI procedure Transmission Fluid Pump
2753510
Marks such as these on the torque converter
bushing are not a reason to replace the torque
converter. They usually occur during removal of
Page 6
October, 2012
the transmission from the vehicle or removal/
installation of the torque converter on the
transmission and are caused by the bushing
contacting the front differential transfer drive gear
support (208) or the 3-5-R housing (422).
Also the marks are below the surface of the
bushing and will not interfere with proper
operation, however if there is a raised burr it can
be removed with a de-burring tool or other
abrasive.
Bulletin No.: 09-07-30-012F
If any of the switch membranes are damaged, as
shown above, the TEHCM must be replaced.
7. The valve body must be disassembled and
cleaned. Refer to the latest version of Corporate
Bulletin Number 08-07-30-005 for direction.
8. The transmission case halves must be separated,
internal components removed and all parts
thoroughly cleaned. Be sure to clean the speed
sensors, both input (ISS) and output (OSS). These
sensors are magnetic and will attach and hold any
ferrous material. Failure to clean these sensors
may result in DTCs. A new pump fluid filter must be
installed.
2850322
6. Inspect the control solenoid (w/body and TCM)
valve assembly (TEHCM) (15) pressure switches.
The O-ring seals may be deformed but if they are
attached, as shown above, the TEHCM should not
be replaced; it should be reused. Deformed seals
do not affect switch performance.
2584822
Notice: The front differential carrier assembly (31)
teeth are marked with notches to identify gear ratio (see
picture above). Do not confuse these marks with tooth
damage. Do not replace the gear for this condition.
2630114
2584820
Bulletin No.: 09-07-30-012F
October, 2012
Page 7
1725885
Important: 2007-2008 applications – when
assembling these transmissions, inspect the control
valve channel upper plate (301) to make sure that it
contains the slot as indicated above. Plates installed
that do not include this slot may result in DTCs.
Parts Information
Part Number
Description
Qty
24254103
PLATE, 3-5 REV CLU (WAVED)
1
Page 8
October, 2012
Bulletin No.: 09-07-30-012F
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
K7407
Description
3-5-Reverse Clutch Plate
Replacement
Labor
Time
Use
Published
Labor
Operation
Time
Note: For diagnosis, reconditioning and other repairs, use
Other Labor Hours (OLH).
Note: For reconditioning work beyond base repair, OLH
must be documented by clock time when reconditioning
begins and is completed. OLH should not be used for work
included in the base repair time.
Note: For steering wheel angle and/or front toe adjustment
times, refer to labor code E2000 and add the applicable
base times to base labor hours.
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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