NHTSA ID Number: 11029264
Manufacturer Communication Number: PIP6101A
TSB/Document Date: 2026-03-03
Summary
The document makes technicians aware of a valvetrain tick noise that is created by one or more soft hydraulic valve lash adjusters. The soft lash adjuster concern is due to debris from the valve rocker arm, entering into the lash adjuster. The document instructs the technician to replace all of the lash adjusters and rocker arms in the entire engine if any soft lash adjusters are found.
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TSB/Document ID: PIP6101A
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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Bulletin No.: PIP6101A
Service Bulletin
Date: February, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
L3B LK0 LSY Tick Noise Soft Hydraulic Valve Lash Adjuster
Model:
Model Year:
from
VIN:
to
from
Engine:
to
Enclave
2025 - 2026
All
All
2.5 LK0
All
Envision
2025 - 2026
All
All
2.0 LSY
All
Blazer
2025 - 2026
All
All
2.0 LSY
All
Colorado
2025 - 2026
All
All
2.7 L3B
All
CT4
2025 - 2026
All
All
2.0 LSY
All
CT5
2025 - 2026
All
All
2.0 LSY
All
XT4
2025 - 2026
All
All
2.0 LSY
All
XT5
2025 - 2026
All
All
2.0 LSY
All
XT6
2025 - 2026
All
All
2.0 LSY
All
Traverse
2025 - 2026
All
All
2.5 LK0
All
Silverado
1500
2025 - 2026
All
All
2.7 L3B
All
Acadia
2025 - 2026
All
All
2.5 LK0
All
Canyon
2025 - 2026
All
All
2.7 L3B
All
Sierra 1500
2025 - 2026
All
All
2.7 L3B
All
Involved Region or Country
North America
Condition
Top End Ticking Noise.
Cause
Valve rocker arm debris, getting inside the hydraulic valve lash adjuster and not allowing
it to pump up with oil, resulting in a soft hydraulic valve lash adjuster.
Correction
Verify the ticking noise is from the valvetrain area by using a stethoscope or other methods.
Remove the camshaft carrier
and inspect for soft hydraulic valve lash adjuster by pushing down on each of the valve
rocker arms where it rests on the hydraulic valve lash adjusters.
Check all of them on intake and exhaust sides.
If any soft hydraulic valve lash adjusters are found, replace all 16 hydraulic valve lash adjusters and all 16 valve
rocker arms.
The video below is an example of a hydraulic valve lash adjuster that is soft .
Copyright 2026 General Motors. All Rights Reserved.
Page 2
February, 2026
Bulletin No.: PIP6101A
Parts Information
Description
Part Number
Adjuster, Hydraulic Valve
Lash
See EPC
Qty
16
Arm, Exhaust Valve Rocker See EPC
8
Arm, Intake Valve Rocker
8
See EPC
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Note: Service department will need to list the valve rocker arm 8 digit part number as the casual part number in the
warranty claim
Labor
Operation
4061270
Description
Labor Time
Hydraulic Valve Lash
Adjuster Replacement
Use
Published
Labor Time
For
Application
Version
2
Modified
02/06/2026 - Created on
02/23/2026 - Updated labor operation, models and correction section
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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