21-NA-186

Bulletin No.:
Service Bulletin
Date:
21-NA-186
March, 2024
TECHNICAL
Subject:
Service Engine Soon Illuminated in Driver Information Center (DIC) and/or a
Malfunctioning Fuel Gauge, DTC U0076/U18A2/P1001/P1434 or Other Message Counter
Incorrect Codes Set
Brand:
Model:
Chevrolet
Malibu
Model Year:
VIN:
from
to
from
to
2020
2024
—
—
Engine:
Transmission:
1.5L (LFV)
—
Involved Region or Country
North America, Israel, Palestine
Condition
Some customers may comment on a Service Engine Soon (SES) light and/or a
malfunctioning fuel gauge.
Technicians may find U0076/U18A2/P1001/P1434 or other Message Counter Incorrect
codes set current or in recent history.
Cause
The cause of the condition may be the wire harness at the Engine Control Module (ECM)
is chafing against the ECM bracket.
Correction
Repair the wire(s) and secure the wire harness.
Copyright 2024 General Motors LLC. All Rights Reserved.
Page 2
March, 2024
Bulletin No.: 21-NA-186
Service Procedure
5890381
5890376
1. Locate the ECM harness (1) in the engine
compartment near the battery. Refer to Engine
Control Module Replacement in SI.
2. Inspect the ECM wire harness for any chafing.
Repair any damaged wires. Refer to Wire to Wire
Repair in SI.
3. Wrap the wire harness with anti-abrasion tape to
prevent more chafing and re-secure the harness.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
5430902
Description
Labor Time
Wire-to-Wire Repair
Use
Published
Labor
Operation
Time
Version
3
Modified
Released August 16, 2021
Revised August 26, 2022 – Added the 2022 Model Year.
Revised February 27, 2024 – Added the 2023-2024 Model Years.
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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