NHTSA ID Number: 11007771
Manufacturer Communication Number: PIP5996A
TSB/Document Date: 2024-09-13
Summary
This Preliminary information communicates diagnostic information for vehicles with transmission noise.
Bulletin No.: PIP5996A
Published date: 08/23/2024
Preliminary Information
PIP5996A Diagnostic Aids for 8 Speed Transmissions With Noise
concerns
Models
Brand:
Model:
ATS
CTS
CT6
CT4
Escalade
Chevrolet
Camaro
Chevrolet Corvette
Chevrolet Colorado (VIN S/T)
Chevrolet Express
Chevrolet Silverado
Chevrolet Silverado 1500 (New Model)
Chevrolet Silverado 1500
Silverado 1500- LTD (RPO J21,
VIN Digit 5 = A/D)
Silverado 1500- LTD (RPO J22,
Chevrolet
VIN Digit 5 = W/Y)
Chevrolet
Canyon
Sierra
Sierra 1500 (New Model)
Sierra 1500
Model
Years:
2016
2019
2016
2019
2016
2018
2020
2024
2015
2020
2016
2023
2015
2019
2017
2023
2017
2024
2015
2018
2019
2020
2021
-
VIN:
Engine: Transmissions:
from to
All
All All
M5N, MNU
All
All All
M5N, MNU
All
All All
M5N, M5X
All
All All
M5N, MHA
All
All All
M5UM5T, M5U
All
All All
M5T, M5U
All
All All
M5U
All
All All
M5T
All
All All
M5U
All
All All
M5U, M5X
All
All All
MQE
All
All All
MQE
2022
All
All All
M5X
2022
All
All All
M5X, MQE
All
All All
MQE
All
All All
M5T
All
All All
MQE
All
All All
MQE
All
All All
MQE
All
All All
M5X, MQE
All
All All
M5X, MQE
All
All All
MQE
All
All All
M5U, MQD
All
All All
M5U
2022
2024
2017
2024
2015
2018
2019
2020
2021
-
-
-
-
Sierra 1500 - Limited (RPO J21,
2022
VIN Digit 5 = 8/9)
Sierra 1500 - New (RPO J22, VIN
2022
Digit 5 = H/U)
Sierra 1500
2024
2017 Savanna
2024
2015 Yukon
2020
Involved Region or
Country
North America
Condition
Some Customers may comment on a noise coming from the
vehicle.
Cause
Upon Inspection the noise may be coming from the rear of the
engine or the front of the transmission.
Correction:
If the vehicle is exhibiting a noise that is originating from under the vehicle, verify where
the noise is coming from.
Raise the vehicle in the air and with the engine running and using a stethoscope verify the
noise is coming from the rear of the engine or the front of the transmission.
If needed a hose can be attached to the vent of the transmission and brought inside the
cabin of the vehicle to pinpoint if the noise is coming from the transmission.
NOTE: Do not unbolt the torque converter from the flexplate as this could lead to not only
to damage to the engine/transmission it can also result in an incorrect diagnosis.
Once the noise is confirmed to be from the front of the transmission, prior to removing the
unit for inspection please verify the following:
If equipped with an L3B engine make sure to follow bulletin 24-NA-078, If the noise if
found to be coming from the starter assembly replace the starter and re-evaluate the
concern.
The starter noise may be intermittent, and the noise can begin even after the engine is
running or following a remote start .
If the vehicle is equipped with any of the following engines LV3, LT1, LT4, L82, L84, L87,
L8T please follow bulletin 23-NA-170 and verify the noise is not coming from the engine or
a damaged thrust bearing.
NOTE: There have been instances of transmissions replaced for engine noise, and often
this noise can appear to be coming from the front and/or middle of the transmission based
on the transfer path.
If no concern is seen with the starter and the engine, the transmission will need to be
removed and inspected.
Make sure to verify the transmission endplay measurement using the proper procedure in
SI prior to replacing the torque converter and prior to disassembly of the unit.
There have been instances of a worn, damaged or missing transmission thrust bearing
and/or other components that can be easily overlooked.
The Endplay measurement is critical, however if a noise concern is found internal to the
transmission, Disassembly and close inspection will be required to verify no missing or
damaged components.
Some of the internal components can be damaged or missing and not effect the endplay
measurement.
Version History
Version
2
Modified
08/15/2024 - Created on.
08/23/2024 - Update Correction.
GM Global Brands
© 2024 General Motors. All Rights Reserved.
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TSB/Document ID: PIP5996A
Replacement Service Bulletin Number:
MFR Communication Date: 2024-09-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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