Bulletin No.:

Service Bulletin

Date:

19-NA-220
February, 2023

TECHNICAL
Subject:

Loss of Propulsion, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0A3F and/or
P1B03 Set
This bulletin replaces PIP5641D. Please discard PIP5641D.

Brand:
Chevrolet

Model:

Model Year:
from

Bolt EV

2017

Bolt EUV

2022

Involved Region or Country

VIN:
to

from

to

2023

—

—

Engine:

Transmission:

—

—

North America, Brazil, Middle East, GM Korea Company
Some customers may comment that a loss of propulsion was experienced.

⇒ The vehicle may operate normally after the vehicle is restarted at a later
time. History code P0A3F and sometimes P1B03 may set.

Condition

Some technicians may find one or both of the following DTCs set in the Hybrid/EV
Powertrain Control Module:
• P0A3F
• P1B03

⇒ If the vehicle has these high voltage DTCs in addition to P0A3F and/or
P1B03, the harness may not be the cause. Contact GM Technical
Assistance (TAC) for further guidance:
• P0A78
• P0C01
• P0C0B

Cause

Correction

Copyright 2023 General Motors LLC. All Rights Reserved.

This condition may be caused by a spread terminal on the vehicle harness connection X2
on the T12 transmission assembly.

⇒ The terminals may not have been perfectly aligned during installation at the
vehicle assembly plant.
Replace the engine wiring harness.
Due to the sensitivity of resolver (motor position sensor) circuits, replacing the connector
with a terminated lead is not permitted per SI document ID 4583435. These diagnostic
codes result in a loss of propulsion event on the vehicle.
Exercise care when connecting the new harness to X2 on the transmission by aligning
the connector bodies and not attempt to install at an angle.

Page 2

February, 2023

Bulletin No.: 19-NA-220

Connector Examples

5518453

Ensure that the connector is fully seated.

5409322

Showing both proper and improper alignment of the X2
connector.

Bulletin No.: 19-NA-220

February, 2023

Page 3

5409321

Example case of damaged terminals. Terminals do not
need to have visible damage to set DTCs P0A3F and
P1B03.

Parts Information
Use the Vehicle Identification Number (VIN) and the GM
Electronic Parts Catalog (EPC) to determine the which
Engine Wiring Harness to order.

Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation

5430940

Description

Labor Time

Engine Wiring Harness
Replacement

Use
Published
Labor
Operation
Time

Version

6

Modified

Released February 4, 2020
Revised February 17, 2020 – Added the 2020 Model Year, removed the VIN breakpoint,
added Brazil to the Involved Region or Country section and added an additional
comparison graphic.
Revised May 13, 2020 – Removed the part numbers and added EPC information to the
Parts Information section, added information to the Condition section and updated the
warranty coverage statement.
Revised March 8, 2021 – Added the 2021 Model Year and updated the Warranty
coverage statement under Warranty Information.
Revised June 24, 2021 – Added the 2022 Model Year to Bolt EV and added the Bolt EUV
model.
Revised February 13, 2023 – Added the 2023 Model Year and clarified Engine Wiring
Harness in Correction, Parts Information and Warranty Information sections.

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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