Bulletin No.: PIP5921B

Service Bulletin

Date: January, 2026

PRELIMINARY INFORMATION
Subject:

Brand:

Diagnostic Tip: Possible No Start, Engine Noise Or SES Lamp with DTC P0011
P0016 Current Or History
Model:

Model Year:
from

VIN:
to

from

Engine:

Transmission:

to

Cadillac

CT4-V

2020 - 2023

All

All

2.7 L3B

All

Chevrolet

Silverado
1500

2019 - 2023

All

All

2.7 L3B

All

GMC

Sierra 1500

2019 - 2023

All

All

2.7 L3B

All

Involved Region or Country

North America

Condition

Possible no start, no compression, abnormal upper engine noise and may have DTC
P0011 P0016 set as current or history

Cause

Potential Intake Camshaft Actuator ticking / rattle noise heard in engine due to loose
Intake Cam Actuator. This noise can occur prior to the actuator cover plate screws
coming loose

Correction
If you encounter one of the above-mentioned vehicles that is experiencing a tapping or scraping or ticking type noise
from the front Intake side of the Cam Carrier, abnormal debris in the engine oil and may have DTC p0011 p0016 set
as current or history. Also, in some cases the vehicle could be a crank no start and have no compression due to
damaged timing components. Reference sound clip below of abnormal Cam Actuator noise during start up.

If any of these conditions are experienced, it will be necessary to remove the upper timing chain cover to inspect the
Intake Cam Actuator cover plate screws for possibly coming loose and contacting the Cam Carrier face.
Video link below references an Intake Cam Actuator that is loose that will create a noise condition prior to the cover
plate screws backing out.

Note: If there are no signs of damage to the Cam Carrier face from the Intake Actuator screws then replace the
Intake Cam Actuator using the latest Service Information.
Picture below showing front side of Intake Cam Actuator. Circled in green and red are the actuator screws.
Note: Circled in red the threaded portion of the screws are below the surface indicating these are loose and have
likely contacted the Cam Carrier face.

Copyright 2026 General Motors. All Rights Reserved.

Page 2

January, 2026

Bulletin No.: PIP5921B

6340517

Back side of Intake Cam Actuator

6340515

Picture below showing damage done to front face of Cam Carrier when the Intake Cam Actuator cover plate screws
come loose and make contact.

Bulletin No.: PIP5921B

January, 2026

Page 3

6331433

Picture below showing torx screws on the Intake Cam Actuator that have come loose and the amount of aluminum
debris in the pick up tube that's possible when the screws contact the Cam Carrier face.

6331432

If the Cam Carrier face has been damaged from an Intake Cam Actuator cover plate screw backing out then
replacement of the engine assembly and turbochager will be recommended due to metal debris in the engine from
Cam Carrier face.
If the Cam Carrier face is not damaged and there is no abnormal metal in the engine oil then replace the Intake Cam
Actuator, any necessary components and change engine oil and filter.

Page 4

January, 2026

Bulletin No.: PIP5921B

Version

3

Modified

05/04/2023 - Created on.
09/04/2024- Added video to correction section.
01/30/2026- Updated to add additional video link showing Intake Cam Actuator that is not
properly parked.

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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