GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4951
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 10, 2019

Subject: 18368-01 - Customer Satisfaction Program
Oil Pump High Pressure
Revised Service Procedure
Models: 2017-2018 Chevrolet Colorado
2017-2018 GMC Canyon
Equipped with LGZ (3.6L Engine)
To:

All General Motors Dealers

This bulletin has been revised regarding the reuse of the engine mount-toframe bolts. The following note has been added at the beginning of the service
procedure.
“Do NOT discard the left side engine mount-to-frame bolts. Clean the nut and
bolt threads thoroughly with a wire brush and denatured alcohol to remove the
old thread adhesive and apply high-strength high-temp thread locker to the
bolt threads where they contact the nut threads (Loctite 272 Red, P/N
89021297, USA and P/N 10953488, Canada or equivalent). Install the left side
engine mount-to-frame bolts and tighten them to 58 N-m (43 lb ft). The left side
engine mount-to-frame bolt information in this note supersedes the published
fastener information in SI.”
Please discard all previous copies of bulletin 18368.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Customer Satisfaction Program
18368 Oil Pump High Pressure
Reference Number:
Revision Description:

Attention:

Make
Chevrolet
GMC

N182180260

Release Date: January 2019
Revision: 01
This bulletin has been revised regarding the reuse of the engine mount-to-frame bolts.
Please review the note at beginning of the service procedure and discard all previous
copies of bulletin 18368.

This bulletin applies to vehicles in Canada or currently registered or previously registered in the
state of Alaska. This program is in effect until January 31, 2021.

Model
Colorado
Canyon

Model Year
From
To
2017
2018
2017
2018

RPO
LGZ
LGZ

Description
3.6L engine
3.6L engine

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition

Correction

Certain 2017 and 2018 model year Chevrolet Colorado and GMC Canyon vehicles equipped with the
3.6L LGZ engine may experience a loss of engine oil caused by high oil pump pressure in cold weather
start conditions. High oil pump pressures under these conditions may cause various components to fail,
including the engine oil cooler (EOC), EOC lines, or the oil pump itself, resulting in a loss of lubrication
in the engine. If this condition occurs, the Driver Information Center will display an oil can light and
multiple warning messages (Oil Pressure Low, Turn Vehicle Off, or Engine Power is Reduced),
depending on the state of the engine. If the vehicle continues to be driven with low oil despite the
appearance of these warnings, the vehicle’s engine may seize, resulting in a stall or loss of propulsion.
Only applies to vehicles in Canada or currently registered or previously registered in the state of Alaska.
Dealers will replace the oil pump.

Parts
Quantity
1
1
1
1
2
2
1
1
2
2
2
6
6
1
1
1
1
1
1
1
1
1

Part Name
Oil Pump Assembly
Oil Filter
PCV Tube Seal
Steering Gear Boot Clamp
A/C Seal (1/2”)
A/C Seal (3/4”)
Engine Coolant (1 gallon)
Engine Coolant (1 gallon, Canada only)
Oil Pan Bolt
Front Wheel Drive Shaft Washer (4WD only)
Front Drive Axle Intermediate Shaft Retaining Ring (4WD only)
Engine Oil (5W-30)
Engine Oil (5W-30, Canada only)
RTV Silicone Sealant
RTV Silicone Sealant (Canada only)
Threadlocker*
Threadlocker**
Threadlocker (Canada only)**
Threadlocker (Canada only)*
Grease
Grease (Canada only)
Oil Pump Drive Bolt

Part No.
12686519
55594651
12653330
12474081
13418809
13418808
12346290
10953464
11548123
15522089
23474671
88865635
19353385
19330905
19369832
12345382
89021297
10953488
10953489
19257121
19257122
11547134

*Medium Strength threadlocker for steering I-shaft lower bolt
**High Strength threadlocker for prop shaft bolts and front wheel drive shaft nut
Parts required to complete this recall are to be obtained from General Motors Customer Care and Aftersales
(GMCC&A). Please refer to your “involved vehicles listing” before ordering parts. Normal orders should be placed on a

Copyright 2019 General Motors. All Rights Reserved.

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Customer Satisfaction Program
18368 Oil Pump High Pressure
DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special
Order. A quantity limiter may be in effect.
Warranty Information
Labor
Operation
9104212

Description
Engine Oil Pump Replacement
2WD
4WD

Labor
Time

Trans.
Type
ZFAT

Net
Item
*

6.8
9.5

* The amount identified in “Net Item” should represent the actual sum total of the current GMCCA Dealer net price for
Threadlocker/Grease needed to perform the required repairs, not to exceed $10.00 USD/CAD.
Service Procedure
Note: Do NOT discard the left side engine mount-to-frame bolts. Clean the nut and bolt threads thoroughly with a wire
brush and denatured alcohol to remove the old thread adhesive and apply high-strength high-temp thread locker to the
bolt threads where they contact the nut threads (Loctite 272 Red, P/N 89021297, USA and P/N 10953488, Canada or
equivalent). Install the left side engine mount-to-frame bolts and tighten them to 58 N-m (43 lb ft). The left side engine
mount-to-frame bolt information in this note supersedes the published fastener information in SI.
1.

Replace the engine oil pump. Refer to Oil Pump Replacement in SI.

5185386

•

For 4WD trucks, it is not necessary to replace the half shaft nut per SI. Clean the nut threads thoroughly with a
wire brush and denatured alcohol and apply high-strength high-temp thread locker (Loctite 272 Red, P/N
89021297, USA and P/N 10953488, Canada or equivalent) to the drive shaft threads as shown. Then reinstall
the nut and tighten to 250 N-m (185 lb-ft).

Dealer Responsibility
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this program must be held and inspected/repaired per the service procedure of this bulletin before
customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealertraded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, through January 31, 2021. Customers who have recently purchased vehicles sold from your vehicle
inventory, and for which there is no customer information indicated on the involved vehicle listing, are to be contacted by
the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this
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Customer Satisfaction Program
18368 Oil Pump High Pressure
bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program followup cards should not be used for this purpose, since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your facility for service
through January 31, 2021, you must take the steps necessary to be sure the program correction has been made before
selling or releasing the vehicle.
Dealer Reports
For dealers with involved vehicles, a listing with involved vehicles has been prepared and will be provided to U.S. and
Canadian dealers through the GM GlobalConnect Recall Reports, or sent directly to export dealers. The listing may
contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor
vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in
several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to
complete this program.
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual, Sections 1.4 and 6.1.10, for
courtesy transportation program details.
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of customer letter included
with this bulletin).

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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

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Customer Satisfaction Program
18368 Oil Pump High Pressure
January 2019
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2017 and 2018 model year Chevrolet Colorado or GMC Canyon vehicle equipped with the
3.6L engine may experience a loss of engine oil caused by high oil pump pressure in cold weather start conditions. High
oil pump pressures under these conditions may cause various components to fail, including the engine oil cooler (EOC),
EOC lines, or the oil pump itself, resulting in a loss of lubrication in the engine. If this condition occurs, the Driver
Information Center will display an oil can light and multiple warning messages (Oil Pressure Low, Turn Vehicle Off, or
Engine Power is Reduced), depending on the state of the engine. If the vehicle continues to be driven with low oil
despite the appearance of these warnings, the vehicle’s engine may seize, resulting in a stall or loss of propulsion.
Your satisfaction with your vehicle is very important to us, so we are announcing a program to prevent this condition or,
if it has occurred, to fix it.
What We Will Do: Your GM dealer will replace the oil pump. This service will be performed for you at no charge until
January 31, 2021. After that, any applicable warranty will apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair. By scheduling an appointment, your dealer can ensure that the
necessary parts will be available on your scheduled appointment date.
If you have any questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
Division
Chevrolet
GMC
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-222-1020
1-800-462-8782
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones (TTY)
1-800-833-2438
1-800-889-2438

We truly appreciate you taking the time to remedy your vehicle as we know your time is valuable. We want you to know
that we will do our best, throughout your ownership experience, to ensure that your GM vehicle provides you many
miles of enjoyable driving.
Neelie O’Connor
Executive Director
North America Contact Center Operations
18368

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