NHTSA ID Number: 11007011
Manufacturer Communication Number: PIP5832A
TSB/Document Date: 2024-09-04
Summary
This Preliminary information communicates to the dealer an issue where a vehicle may be exhibiting an engine noise condiion. The dealer is instructed on how to isolate the noise to a specific area of the engine for further diagnosis. ?
Bulletin No.: PIP5832A
Published date: 07/10/2024
Preliminary Information
PIP5832A Diagnostic Tips For Engine Noises
Models
Brand:
Model: Model Years:
Cadillac
Escalade 2021
Chevrolet Silverado 2019
Chevrolet Suburban 2021
Chevrolet Tahoe
2021
GMC
Sierra
2019
GMC
Yukon
2021
-
2024
2024
2024
2024
2024
2024
VIN:
from to
All
All 6.2L
All
All 5.3L
All
All 5.3L
All
All 5.3L
All
All 5.3L
All
All 5.3L
Engine:
L87
L84,
L84,
L84,
L84,
L84,
6.2L
6.2L
6.2L
6.2L
6.2L
Transmissions:
All
L87 All
L87 All
L87 All
L87 All
L87 All
Involved Region or
Country
North America
Condition
Engine may exhibit an internal ticking, tapping or
knocking noise that may be difficult to isolate.
Cause
Multiple possibilities
Correction:
If a noise has been determined to be coming from the engine area the following may be
helpful in isolating to the upper or lower end:
Verify the noise is not coming from an accessory drive component by briefly running the
engine with the accessory drive belt removed.
Using GDS2 select "Cylinder Power Balance" in Fuel System section of output control
functions, cancel cylinders one by one and see if the noise is noticeably changed.
Note - Please avoid using GDS2 control function "Cylinder Deactivation" for this procedure
as it is deactivating the lifters and is intended for misfire/DFM system diagnosis. This
function can be misleading when used for noise diagnostics since it may change/eliminate
a lower end noise and give the impression it is a lifter since that is what is being
commanded, potentially leading to unnecessary lifter replacement.
If the noise is changed, make a note of which cylinder(s) made the most impact on the
noise.
Noises that are noticeably affected by cylinder cancellation are typically considered a
"lower end noise" (connecting rod bearing, wrist pin etc.) whereas valvetrain noises aren't
generally impacted by this procedure.
Please review appropriate SI engine noise diagnostic for further isolation of a specific
component.
Version History
Version
2
Modified
12/16/2021 - Created on.
07/10/2024 - Updated Model Years
GM Global Brands
© 2024 General Motors. All Rights Reserved.
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TSB/Document ID: PIP5832A
Replacement Service Bulletin Number:
MFR Communication Date: 2024-09-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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