22-NA-080

Service Bulletin
Bulletin No.:
22-NA-080
Date:
April, 2022
TECHNICAL
Subject:
Diagnostic Tips for Engine Related Shudder Concerns
This bulletin replaces PIP5794B. Please discard PIP5794B.
Brand:
Cadillac
Chevrolet
Model:
Escalade Models
to
2015
2022
CT5
2022
2022
Camaro
2016
2022
Corvette
2014
2022
Express
2021
2022
Silverado
2014
2018
Silverado LD
2019
2019
Silverado 1500
(New Model)
2019
2021
Breakpoint Date:
from
to
Engine:
Silverado 1500 - LTD
(RPO J21, VIN Digit
12 = 4 or less)
Silverado 1500 New (RPO J22, VIN
Digit 12 = 5 or
greater)
Silverado
2500HD/3500HD
Suburban
Tahoe
Savana
GMC
Model Year:
from
2022
2022
2020
SOP
2015
2021
2022
Sierra
2014
2018
Sierra Limited
2019
2019
Sierra 1500
(New Model)
2019
2021
Sierra 1500 - Limited
(RPO J21, VIN Digit
12 = 4 or less)
Sierra 1500 - New
(RPO J22, VIN Digit
12 = 5 or greater)
2022
2022
Sierra
2500HD/3500HD
2020
Yukon Models
2015
Copyright 2022 General Motors LLC. All Rights Reserved.
EOP
4.3L (LV3),
5.3L (L82,
L83, L84)
6.2L (LT1, LT2,
LT4, L86, L87),
6.6L (L8T)
Transmission:
Page 2
April, 2022
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, Phiippines, 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.
Correction
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.
– 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.
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
April, 2022
Page 3
6029096
Suspect fault in camshaft actuator system (variance
over 4 degrees)
Parts Information
Causal
Part
Description
Part
Number
Qty
X
MAGNET, CM/
SHF POSN ACTR
12675031
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
1
Modified
Released April 20, 2022
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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