22NA022

Bulletin No.:
Service Bulletin
Date:
22-NA-022
February, 2022
INFORMATION
Subject:
Diagnostic Tip for LM2 Diesel with a Rear Main Oil Leak with or without DTC P06DD set
This bulletin replaces PIP5795. Please discard PIP5795.
Brand:
Model:
Cadillac
Chevrolet
GMC
Model Year:
from
to
Escalade Models
2021
2022
Silverado 1500
2020
2021
Silverado 1500 (LTD, RPO J21, 12th
VIN Digit = 4 or less)
2022
2022
Suburban
2021
2022
Tahoe
2021
2022
Sierra 1500
2020
2021
Sierra 1500 (Limited, RPO J21,
12th VIN Digit = 4
or less)
2022
2022
Yukon Models
2021
2022
VIN:
from
Engine:
Transmission:
to
3.0L (LM2)
Involved Region or Country
North America, Middle East, Chile (West), Colombia (West), Ecuador (West), Paraguay
(West), Peru (West), Japan, Cadillac Korea (South Korea), Thailand (ASEAN), Australia/
New Zealand
Condition
Some customers may comment on a oil leak.
The technician may find DTC P06DD set.
Cause
This condition may be caused by the rear main oil seal may have moved or severely
shifted out of position in the Timing Chain Lower Cover.
Correction
Replace the Timing Chain Lower Cover that comes with a seal already installed.
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
February, 2022
Bulletin No.: 22-NA-022
Service Procedure
Refer to Timing Chain Lower Cover Installation in SI.
Record the Part Unique Number found on the white
label attached to the back of the cover as shown in the
picture below.
5786653
5786767
Example: PUN 50H32015310119
The Timing Chain Lower Cover comes with a 2 piece
protector/installer.
The inner piece becomes an installation tool.
The outer piece simply holds them together for
shipment.
Note: The inner piece is an installation tool designed
to be a substitute for the EN52466-2 installation tool. It
fits over the bevel on the end of the crankshaft to
facilitate installation. Be extremely mindful that the
inner lip of the seal slides over the rear of the
crankshaft without rolling or a repeat oil leak will occur.
The protector/installer has a snug fit to the pilot of the
crankshaft.
The picture below is shown without the cover for clarity.
5786655
5786654
Remove the outer piece (2) and discard it.
Parts Information
Description
Part
Number
Qty
Lower Timing Cover
55515618
1
Bulletin No.: 22-NA-022
February, 2022
Page 3
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
4064380
Timing Chain Lower Cover Replacement
Use the Published Labor
Operations Time
Version
1
Modified
Released January 31, 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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