22-NA-080 Service Bulletin/Repair Instructions

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
Cadillac
Chevrolet
Escalade Models
2015
CT5
2022
Camaro
2016

2014
Express
2021
Silverado
2014
2018
Silverado LD
2019
2019
Silverado 1500 (New

Model)
2019
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
Sierra 2500HD/

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
Engine:
2025
Corvette
Silverado 1500 - New

(RPO J22, VIN Digit

5= A/D)
GMC
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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