NHTSA ID Number: 10163238
Manufacturer Communication Number: 19NA108
TSB/Document Date: 2019-07-29
Summary
This technical bulletin provides a procedure to replace the head gaskets if found doubled stacked.
Service Bulletin
Bulletin No.:
19-NA-108
Date:
June, 2019
TECHNICAL
Subject:
Brand:
Cold Start Rough Run, Misfire and/or Malfunction Indicator Lamp (MIL) Illuminated
Model:
Model Year:
VIN:
from
to
Silverado
2017
2018
Silverado
2500/3500
2019
2019
Sierra
2017
2018
Sierra
2500/3500
2019
2019
from
to
Engine:
L5P
Involved Region or Country
North America, N.A. Export Markets and Israel
Condition
Some customers may comment on one or more of the following conditions:
• Engine runs rough during cold stars, but smooths out when warmed up
• Engine misfires
• MIL illuminated
Some technicians may find injector timing related DTCs on ONE bank of the engine.
Cause
Correction
Copyright 2019 General Motors
LLC. All Rights Reserved.
This condition may be caused by two head gaskets being installed on one bank of the
engine.
Important: The vehicle must have more than 2000 miles (3219 km) since new or the
latest fuel injector replacement.
Page 2
June, 2019
Bulletin No.: 19-NA-108
5336396
Inspect for two head gasket tabs on the driver’s side front of the engine (as shown) or on
the passenger’s side rear of the engine. A bore scope or inspection mirror may be used
between the power steering pump bracket and engine. Inspecting the passenger’s side
head gasket tab(s) can be made easier from underneath with the vehicle on a lift and a
bore scope.
⇒ If two head gaskets on one bank of the engine is confirmed, during removal,
please try to keep the two gaskets together as an assembly. DO NOT try to
separate them. Engineering would like these kept together for analysis.
Install a new head gasket with the same grade that was removed.
Parts Information
Service Procedure
Note: Prior to installing the rocker arm shaft, loosen all
rocker arm adjustment nuts AND unscrew the adjuster.
This will help prevent piston to valve contact and
potential damage to the pushrods.
Replace the affected cylinder head gasket with the
same grade that was removed. Refer to Cylinder Head
Replacement - Left Side or Cylinder Head
Replacement - Right Side in SI.
Causal
Part
Description
Part
Number
Qty
X
GASKET, CYL HD
Refer
to EPC
1
Bulletin No.: 19-NA-108
June, 2019
Page 3
Warranty Information
Note: Only select the Labor Operation that coincides
with the repair performed.
For vehicles repaired under warranty, use:
Labor Operation
Description
4061670
Cylinder Head Gasket Replacement - Right Side
4061690
Cylinder Head Gasket Replacement - Left Side
4061731
Cylinder Head Gasket Replacement - Both Banks
Version
2
Modified
Released May 16, 2019
Revised June 25, 2019 - Added additional keywords.
Labor Time
Use the Published Labor
Operations Time
Additional Keywords: Coolant Leak, Coolant, Leak
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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TSB/Document ID: 19NA108
Replacement Service Bulletin Number:
MFR Communication Date: 2019-06-25
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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