NHTSA ID Number: 10182584
Manufacturer Communication Number: PIP5711A
TSB/Document Date: 2020-11-16
Summary
This Preliminary information communicates to the dealer technicians a warm engine knock noise has no short or long term effects on the engine. Do not attempt repairs for this noise.?
Bulletin No.: PIP5711A
Published date: 10/30/2020
Preliminary Information
PIP5711A 2020 and 2021 6.6 L5P Duramax Warm Engine Idle
Knock Noise
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Silverado 2500/3500
2020 - 2021
All
All
6.6 L5P
All
Sierra 2500/3500
2020 - 2021
All
All
6.6 L5P
All
Involved Region or
Country
North America
Condition
Customers may have a concern of a thumping or knocking noise coming from what
sounds like the rear of the engine.
Cause
Characteristic noise being ampli ed by the transmission bell housing.
Correction:
The noise described in this communication is audible in the interior and exterior of the vehicle but is more
pronounced in the interior.
The noise is easiest to duplicate under the following conditions:
Engine at idle (about 600 RPM)
Engine oil temperature 113 - 185 degrees Fahrenheit (45 - 85 degrees Celsius)
Transmission in P/N
HVAC fan o
Radio o
To verify this is the noise described in this PI, remove the accessory drive auxiliary belt. If the noise level is
signi cantly reduced it should be considered characteristic of the 2020 and 2021 model year vehicles and no
further repair attempts should be made.
Engineering has provided the following procedure for auxiliary belt removal, testing and installation:
1. Remove the air cleaner housing.
2. Remove intake air duct.
3. Separate the charge air cooler (CAC) tube and position aside.
4. Remove the auxiliary belt and position aside.
5. Install CAC tube.
6. Loosely place air box and intake duct back in place. (So you don’t set a code for sensor when starting.)
7. Start engine and verify noise is gone.
8. Remove loosely installed air box and intake duct.
9. Separate CAC tube.
10. Install auxiliary belt.
11. Install CAC tube.
12. Install air box and duct.
NOTE: Do not run the vehicle more than three minutes without the auxiliary belt installed. Do not raise the RPM
higher than idle with the auxiliary belt removed.
This noise has no short or long term e ects on the engine. Do not attempt repairs for this noise.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
4087118
Description
Warm Engine Idle Knock Noise
*This is a unique Labor Operation for Bulletin use only.
Labor Time
0.5 Hrs.
Version History
Version
Modi ed
2
03/03/2020 - Created
10/30/2020 - Updated to clarify auxiliary belt and to include the 2021 model
year.
© 2020 General Motors
. All Rights Reserved.
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TSB/Document ID: PIP5711A
Replacement Service Bulletin Number:
MFR Communication Date: 2020-10-30
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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