NHTSA ID Number: 11024330
Manufacturer Communication Number: 22-NA-080
TSB/Document Date: 2025-10-16
Summary
This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
Bulletin No.: 22-NA-080
Service Bulletin
Date: September, 2025
TECHNICAL
Subject:
Diagnostic Tips for Engine Related Shudder Concerns
This bulletin replaces PIP5794B. Please discard PIP5794B.
Brand:
Model:
Model Year:
from
Escalade Models
2015
CT5
2022
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2016
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2021
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2014
2018
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2019
2019
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2021
2022
2022
Silverado 1500 - LTD
(RPO J21, VIN Digit
5= W/Y)
Silverado 1500
2023
Silverado 2500HD/
3500HD
2020
Suburban
Tahoe
2025
2025
2015
2021
2025
Sierra 1500
2014
2018
Sierra Limited
2019
2019
Sierra 1500 (New
Model)
2019
2021
2022
2022
Sierra 1500 - New
(RPO J22, VIN Digit 5
= H/U)
Sierra
2023
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3500HD
2020
Yukon Models
2015
Copyright 2025 General Motors
. All Rights Reserved.
to
2024
Savana
Sierra 1500 - Limited
(RPO J21, VIN Digit
5= 8/9)
from
2025
Corvette
Silverado 1500 - New
(RPO J22, VIN Digit
5= A/D)
to
Breakpoint Date:
2025
SOP
EOP
4.3L (LV3),
5.3L (L82, L83, L84)
6.2L (LT1, LT2, LT4,
L86, L87), 6.6L (L8T)
Transmissi
on:
Page 2
September, 2025
Bulletin No.: 22-NA-080
Involved Region or Country
North America, Europe, Uzbekistan, Middle East, Iraq, Israel, Palestine, Argentina
(Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West), Colombia (West), Ecuador
(West), Paraguay (West), Peru (West), Uruguay (West), Venezuela (West), Japan,
Cadillac Korea (South Korea), GM Korea Company, China - SGM, Taiwan, Thailand
(ASEAN), Singapore, Philippines, Australia/New Zealand, Egypt, Other Africa, South
Africa
Condition
Some customers may comment that they feel a Shudder or Surge type feeling when
driving at a steady speed.
- Some customers may mistake it for a transmission related concern.
Cause
This condition may be caused by the camshaft actuator magnet sticking.
If the concern has been determined to be engine related and not being caused by the
transmission the following diagnosis may be helpful:
- While duplicating the Shudder or Surge concern monitor the data parameter "Camshaft Position Variance" in GDS2. Although target variance is 0 degrees, it is not uncommon to observe variance of up to 3-4 degrees on a properly functioning system.
Correction
- Any variance exceeding 3-4 degrees could potentially cause a noticeable Shudder or
Surge concern. If after diagnosis you confirm that the concern has been isolated to the
camshaft actuator system, it is recommended to replace the camshaft actuator magnet
and re-evaluate. Refer to Camshaft Position Actuator Magnet Replacement in SI.
If the Shudder/Surge is still present after camshaft actuator magnet replacement and
camshaft actuator variance is over 4 degrees, refer to GM Service Information for further
diagnosis.
Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws
applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,
preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a
conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you
must follow those applicable laws.
Below are line graph examples from GDS2, one showing normal operation of the camshaft actuator system and one
that is considered suspect and not operating properly:
6029095
Normal operation (variance under 4 degrees)
Bulletin No.: 22-NA-080
September, 2025
Page 3
6029096
Suspect fault in camshaft actuator system (variance over 4 degrees)
Parts Information
Note: Only select the parts that coincide with the repair performed. Replace the part with the P/N outlined in the
Electronic Parts Catalog (EPC) in accordance with the vehicle VIN.
Causal
Part
X
Description
Part
Number
MAGNET,
CM/SHF POSN
ACTR
12675031
12670340
Qty
1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
4064870
4021760
Description
Labor Time
Camshaft Position Actuator Magnet
Use the Published Labor
Operations Time
Version
4
Modified
Released April 20, 2022
Revised July 21, 2022 - Added 12670340 to Parts Information section.
Revised July 13, 2023 - Added 2023 and 2024 to Applicable Vehicles.
Revised September 05, 2025 - Added 2025 Model Year to Applicable Vehicles.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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TSB/Document ID: 22-NA-080
Replacement Service Bulletin Number:
MFR Communication Date: 2025-09-06
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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