19NA220

Bulletin No.:
Service Bulletin
Date:
19-NA-220
March, 2021
TECHNICAL
Subject:
Loss of Propulsion, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0A3F and/or
P1B03 Set
This bulletin replaces PIP5641D. Please discard PIP5641D.
Brand:
Model:
Chevrolet
Bolt EV
Model Year:
VIN:
from
to
from
to
2017
2021
—
—
Involved Region or Country
Engine:
Transmission:
—
—
North America, Middle East, South Korea, Brazil
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 2021 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 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
March, 2021
Connector Examples
Bulletin No.: 19-NA-220
Showing both proper and improper alignment of the X2
connector.
5518453
Ensure that the connector is fully seated.
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
Description
Labor Time
5430940
Engine Wiring Harness
Replacement
Use
Published
Labor
Operation
Time
5409322
Version
4
Modified
Released February 4, 2020
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.
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.
March 8, 2021 – Added the 2021 Model Year and updated the Warranty coverage
statement under Warranty Information.
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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