20NA197

Bulletin No.:
Service Bulletin
Date:
20-NA-197
December, 2021
TECHNICAL
Subject:
Brand:
Malfunction Indicator Lamp (MIL) Illuminated - DTC P0087, P0089, P0191, P026D,
P1089, P163A, P163B, P2293, P228A, P228B, P228C, and/or P228D Set
Model:
Colorado
Chevrolet
GMC
Model Year:
VIN:
from
to
Engine:
from
to
2016
2021
LWN
LWN
Express
2017
2021
Silverado
2017
2018
Silverado
2500HD/3500HD
2019
2021
Silverado 4500HD,
5500HD and 6500HD
2019
2021
L5D
Canyon
2016
2021
LWN
LWN
Savana
2017
2021
Sierra
2017
2018
Sierra
2500HD/3500HD
2019
2021
Transmission:
L5P
L5P
Involved Region or Country
North America, Middle East, Israel, Palestine
Condition
Some customers may comment that the MIL is illuminated.
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0087: Fuel Rail Low Pressure
• P0089: Fuel Pressure Regulator 1 Performance
• P0191: Fuel Rail Pressure Sensor 1 Performance
• P026D: Injection Quantity Too High
• P1089: Fuel Rail Pressure Performance During Deceleration Fuel Cut-Off
• P163A: Control Module Fuel Pressure Regulator 1 Control System Circuitry
Performance
• P163B: Control Module Fuel Pressure Regulator 2 Control System Circuitry
Performance
• P2293: Fuel Pressure Regulator 2 Performance
• P228A: Fuel Pressure Regulator 1 Control - Forced Engine Shutdown
• P228B: Fuel Pressure Regulator 2 Control - Forced Engine Shutdown
• P228C: Fuel Pressure Regulator 1 Control Performance - Low Pressure
• P228D: Fuel Pressure Regulator 1 Control Performance - High Pressure
Cause
This condition may be caused by corrosion or damaged at the fuel pressure sensor
electrical connector.
Copyright 2021 General Motors LLC. All Rights Reserved.
Page 2
December, 2021
Bulletin No.: 20-NA-197
5652222
Inspect the fuel pressure sensor electrical connector for corrosion or damage.
⇒ It may be necessary to use a generous enough amount of dielectric grease
in the connector to reach the entire terminal and use J-35616–16 (LT GN)
terminal test tool and drag the tool up to 10 times to find/identify corrosion or
fretting.
Correction
Note: When making the final connection of this electric connector to the sensor, please
apply dielectric grease prior to installation.
5652223
• If you see a suspect terminal, it may be necessary to removal said terminal and
inspect for corrosion, damage and/or signs of the dielectric grease starting to turn
black.
• If any of the conditions have been found, replace the electrical connector.
Bulletin No.: 20-NA-197
December, 2021
Page 3
Service Procedure
Refer to Connector Repairs in SI.
Parts Information
Causal
Part
Description
Part
Number
Qty
N/A
CONNECTOR,
WRG HARN
19367009
1
N/A
ACDelco
Dielectric
Lubricant*
12377900
(U.S.)
10953529
(Canada)
1
*There is enough material to do additional vehicles. Store
the remaining material for future use.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation
Description
Labor Time
5480878*
Fuel Rail Fuel Pressure Sensor Connector Replacement
0.9 hr
*This is a unique Labor Operation for Bulletin use only.
Version
4
Modified
Released September 23, 2020
Revised November 16, 2020 - Added Unique Labor Operation Number to Warranty
Information section and 2021 Model Year for 2500/3500HD and 4500/5500/6500HD.
Revised March 04, 2021 - Removed P026C Information and Added Additional Vehicle
Models.
Revised December 06, 2021 - Added Colorado to Model 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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