NHTSA ID Number: 10201315
Manufacturer Communication Number: PIP5794B
Summary
This Preliminary information communicates diagnostics to the dealer involving a vehicle shudder concern caused by the camshaft actuator system that can be mistaken for a transmission
issue.
26 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CADILLAC | ESCALADE | 2020-2021 |
| CHEVROLET | SILVERADO 1500 | 2019-2021 |
| CHEVROLET | SILVERADO 2500 | 2019-2021 |
| CHEVROLET | SILVERADO 3500 | 2019-2021 |
| CHEVROLET | SUBURBAN | 2020-2021 |
| CHEVROLET | TAHOE | 2020-2021 |
| GMC | SIERRA 1500 | 2019-2021 |
| GMC | SIERRA 2500 | 2019-2021 |
| GMC | SIERRA 3500 | 2019-2021 |
| GMC | YUKON | 2020-2021 |
Condition
Vehicle may exhibit a shudder while driving that may be mistaken for a transmission related concern
Cause
Camshaft Actuator System
Correction:
If the concern has been determined to be engine related and not being caused by the transmission the following may be helpful:
While duplicating the shudder 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 concern.
If the concern has been isolated to the camshaft actuator system, it is recommended to replace the camshaft actuator magnet and re-evaluate.
If the shudder is still present after camshaft actuator magnet replacement and camshaft actuator variance is over 4 degrees, refer to GM Service Information for further assistance with diagnosis.
Parts Information
| Part Number | Description | Quantity |
| 12675031 | MAGNET, CM/SHF POSN ACTR | 1 |
SEOCONTENT-START
Bulletin No.: PIP5794B Published date: 08/18/2021
Preliminary Information
PIP5794B Diagnostic Tips For Engine Related Shudder / Surge Concerns
ModelsBrand: Cadillac
Model: Escalade
Model Years: 2020 – 2021
VIN:
from to
All All
5.3L L84, 6.2L L87
All
Chevrolet Chevrolet Chevrolet GMC GMC
Silverado Suburban Tahoe Sierra Yukon
2019 – 2021
2020 – 2021
2020 – 2021
2019 – 2021
2020 – 2021
All All All All All
All All All All All
4.3L LV3 5.3L L82 L84, 6.2L L87
5.3L L82/L84, 6.2L L87
5.3L L84, 6.2L L87
4.3L LV3 5.3L L82 L84, 6.2L L87
5.3L L84, 6.2L L87
All All All All All
Involved Region or Country Condition
Cause
North America
Vehicle may exhibit a shudder / surge while driving that may be mistaken for a transmission
related concern Camshaft Actuator System
Correction:
If the concern has been determined to be engine related and not being caused by the transmission
the following may be helpful: While duplicating the shudder 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 / surge concern.
If the concern has been isolated to the camshaft actuator system, it is recommended to replace the
camshaft actuator magnet and re-evaluate.
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 or GM TAC for further
assistance with diagnosis.
Below are line graphs from GDS2, one showing normal operation of the camshaft actuator system and
one that is not operating properly.
Normal operation (variance under 4 degrees):
Fault in camshaft actuator system (variance over 4 degrees):
Parts Information
Part Number Description
Quantity
12675031 MAGNET, CM/SHF POSN ACTR
1
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference
the Applicable Warranties section of Investigate ry (IVH) for coverage information.
Labor Op
4087978*
Description
Camshaft Position Actuator Magnet Replacement
*This is a unique Labor Operation for Bulletin use only.
Time
4.9 hours
Version History
Version 2
03/25/2021 – Created on
Modified
04/07/2021 – Updated to edit correction and parts information.
08/18/2021 – Updated to include surge to the document as a possible symptom.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5794B
Published date: 08/18/2021
MC-10201315-9999.pdf 240.086KB
NHTSA ID Number: 10193436
Manufacturer Communication Number: PIP5794A
Summary
This Preliminary information communicates diagnostics to the dealer involving a vehicle shudder concern caused by the camshaft actuator system that can be mistaken for a transmission issue.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5794A
Published date: 04/7/2021
MC-10193436-9999.pdf 240.147KB
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