NHTSA ID Number: 10202400
Manufacturer Communication Number: PIP5824
Summary
This Preliminary information communicates a possible issue with the active fuel management rockers causing a misfire and the correction for this concern.
Condition
A 2021 vehicle equipped with a HFV6 Gen2 engine with AFM may be brought into the dealership with misfires on cylinder 2 or 5.
This could be misfire all the time or start after an AFM event that may or may not go away.
Cause
We have determined there is an issue with some rockers / SRFF’s on the vehicles within the breakpoints listed above.
Parts Information
| Description | Part Number | QTY. |
| Switching valve rocker arm | 12666601 | 4 |
| Dual Feed Hydraulic Lash Adjuster | 12690246 | 4 |
8 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | CT5 | 2021 |
| CADILLAC | XT5 | 2021 |
| CADILLAC | XT6 | 2021 |
| CHEVROLET | BLAZER | 2021 |
| CHEVROLET | CAMARO | 2021 |
| CHEVROLET | COLORADO | 2021 |
| GMC | ACADIA | 2021 |
| GMC | CANYON | 2021 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5824
Published date: 09/22/2021
MC-10202400-9999.pdf 100.326KB
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Last update on 2026-06-03 / Affiliate links / Images from Amazon Product Advertising API
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Bulletin No.: PIP5824 Published date: 09/22/2021 Preliminary Information PIP5824 2021 HFV6 Engine Misfire On AFM Cylinders 2 or 5 Models Brand: Cadillac Cadillac Cadillac Chevrolet Chevrolet Chevrolet GMC GMC Model: CT5 XT5 XT6 Blazer Camaro Colorado Acadia Canyon Model Years: 2021 2021 2021 2021 2021 2021 2021 2021 VIN: from to 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 2/1/2021 7/1/2021 Engine: 3.0 LGY 3.6 LGX 3.6 LGX 3.6 LGX 3.6 LGX 3.6 LGZ 3.6 LGX 3.6 LGZ All All All All All All All All Transmissions: Involved Region or Country Condition Cause North America A 2021 vehicle equipped with a HFV6 Gen2 engine with AFM may be brought into the dealership with misfires on cylinder 2 or 5. This could be misfire all the time or start after an AFM event that may or may not go away. We have determined there is an issue with some rockers / SRFF’s on the vehicles within the breakpoints 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 remains or comes back after an AFM event on the same cylinder, replace all 4 rockers / SRFF’s and all 4 SHLA’s / lifters for the affected cylinder. If the misfire goes away or moves to the other bank, replace the AFM oil control solenoid. Parts Information Description Switching valve rocker arm Dual Feed Hydraulic Lash Adjuster Part Number 12666601 12690246 QTY. 4 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. Version History Version 1 Modified 09/22/2021 – Created on.
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