NHTSA ID Number: 11014627
Manufacturer Communication Number: PIP5824D
TSB/Document Date: 2025-03-02
Summary
This Preliminary information communicates a possible issue with the active fuel management rockers causing a misfire and the correction for this concern.
Bulletin No.: PIP5824D
Published date: 02/25/2025
Preliminary Information
PIP5824D HFV6 Gen2 Engine Misfire On AFM Cylinders 2 or 5
Models
Brand:
Model: Model Years:
Cadillac
CT5
2021
Cadillac XT5
2021
Cadillac XT6
2021
Chevrolet Blazer
2021
Chevrolet Camaro 2021
Chevrolet Colorado 2021
GMC
Acadia 2021
GMC
Canyon 2021
-
Involved Region or
Country
North America, Europe, Uzbekistan, Russia, Middle East, Iraq,
Israel, Palestine, Argentina, Brazil, Bolivia, Chile, Colombia,
Ecuador, Paraguay, Peru, Uruguay, Venezuela, Japan, Cadillac
Korea (South Korea), GM Korea Company, China, Taiwan,
Thailand, Singapore, Philippines, Australia/New Zealand, Egypt,
Other Africa, South Africa
Condition
Cause
2025
2025
2025
2025
2024
2022
2023
2022
VIN:
Engine: Transmissions:
from to
All
All 3.0 LGY All
All
All 3.6 LGX All
All
All 3.6 LGX All
All
All 3.6 LGX All
All
All 3.6 LGX All
All
All 3.6 LGZ All
All
All 3.6 LGX All
All
All 3.6 LGZ All
A 2021 - 2025 vehicle equipped with a HFV6 Gen2 engine with
AFM may be brought into the dealership with misfires on
cylinder 2 or 5 and may be accompanied by a rough idle
complaint.
This could be misfire all the time or start after an AFM event
that may or may not go away.
We have also seen this on a cold start that then goes away.
We have determined there is an issue with some rockers /
SRFF's on the vehicles within Model Years listed above.
Correction:
If you have a vehicle with this concern, swap the AFM rocker oil control solenoid in the
camshaft cover from side to side and reevaluate.
If the misfire goes away or moves to the other bank, replace the AFM oil control solenoid.
If the misfire remains or comes back after an AFM event or a cold start on the same
cylinder, remove that bank camshaft cover and turn the engine over by hand while closely
watching the valves on the misfiring cylinder.
If the cylinder was a dead misfire all the time and the valves open, continue with normal
misfire diagnosis.
If the valves do not open(either intake or exhaust) replace all 4 rockers / SRFF's and all 4
SHLA's / lifters for the affected cylinder.
NOTE: This PI will be updated or changed to a bulletin when engineering has decided there
is no longer a parts concern with these rockers or a new part comes out.
Parts Information
Description
Part Number
QTY.
Switching valve rocker arm
12666601
4
Dual Feed Hydraulic Lash Adjuster
12690246
4
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.
Please use the Labor Operation for the vehicle and bank you are working on.
Additional SI Keywords
DTC, P0300, P0302, P0305,
Version History
Version 3
5
Modified
09/22/2021 02/25/2022 breakpoint.
11/10/2022 01/08/2024 02/25/2025 cold start.
Created on.
Updated to add Model Year and remove
Updated to add Model Year.
Updated to add Model Year.
Updated to add Model Year add direction of
GM Global Brands
© 2025 General Motors. All Rights Reserved.
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TSB/Document ID: PIP5824D
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-25
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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