Bulletin No.:

Service Bulletin

Date:

18-NA-225
August, 2019

TECHNICAL
Subject:

No Propulsion – MIL Illuminated with One or More Following DTCs P0ABC, P0AFA,
P1AE6, P0D26, P0C78, P0ABB Set

Brand:

Model:

Chevrolet

Bolt EV

Model Year:

Build Date Breakpoint:

from

to

2017

2019

from

Engine:

Transmission:

—

—

to
—

Involved Region or Country

North America, South Korea, Middle East

Condition

Some customers may comment on a loss of propulsion with the Malfunction Indicator
Lamp (MIL) illuminated.

Cause

The Drive Motor Battery High Voltage Manual Disconnect Lever contains a fuse that may
have failed open. The technician may find one or more of the following DTCs set in the
Hybrid/EV Powertrain Control Module 2:
• DTC P0ABC Hybrid/EV Battery Voltage Sensor Circuit Low Voltage
• DTC P0AFA Hybrid/EV Battery System Voltage Low Voltage
• DTC P1AE6 Battery Energy Control Module Hybrid/EV Battery Voltage Isolation
Sensor Circuit
• DTC P0C78 Hybrid/EV Battery System Precharge Time Too Long
• DTC P0ABB Hybrid/EV Battery Voltage Sensor Performance
• DTC P0D26 Battery Charger System Precharge Time Too Long

Correction

Perform the Service Procedure.

Copyright 2019 General Motors LLC. All Rights Reserved.

Page 2

August, 2019

Service Procedure
Danger: Always perform the High Voltage
Disabling procedure prior to servicing any High
Voltage component or connection. Personal
Protection Equipment (PPE) and proper procedures
must be followed.
The High Voltage Disabling procedure includes the
following steps:
• Identify how to disable high voltage.
• Identify how to test for the presence of high
voltage.
• Identify condition under which high voltage is
always present and personal protection equipment
(PPE) and proper procedures must be followed.
Before working on any high voltage system, be
sure to wear the following Personal Protection
Equipment:
• Safety glasses with appropriate side shields when
within 15 meters (50 feet) of the vehicle, either
indoors or outdoors.
• Certified and up-to-date Class "0" Insulation gloves
rated at 1000V with leather protectors.
– Visually and functionally inspect the gloves
before use.
– Wear the Insulation gloves with leather
protectors at all times when working with the
high voltage battery assembly, whether the
system is energized or not.
Failure to follow the procedures may result in
serious injury or death.
Drive Motor Battery High Voltage Manual
Disconnect Lever Replacement
Important: The Drive Motor Battery High Voltage
Manual Disconnect Lever is also known as the
S15 Manual Service Disconnect (MSD).
1. Place the vehicle in Service Mode.
2. Verify that one or more of the following DTCs are
set: DTC P0ABC, P0AFA, P1AE6, P0C78, P0ABB
or P0D26. Refer to Diagnostic System Check Vehicle in SI.
⇒ If DTC P0ABC, P0AFA, P1AE6, P0C78, P0ABB
or P0D26 are set, Go to Step 3.
⇒ If any other DTCs are set, Go to Diagnostic
Trouble Code (DTC) List - Vehicle in SI.
3. Vehicle OFF.
4. Disable the high voltage at the A4 Hybrid/EV
Battery Pack. Refer to High Voltage Disabling
in SI.
5. Remove the rear seat cushion. Refer to Rear Seat
Cushion Removal and Installation in SI.

Bulletin No.: 18-NA-225

6. Verify that the S15 Manual Service Disconnect is
installed completely, the lever is fully seated and
the CPA is secure. Refer to Drive Motor Battery
High Voltage Manual Disconnect Lever
Replacement in SI.
⇒ If the S15 Manual Service Disconnect is
installed properly, Go to Step 7.
⇒ If the S15 Manual Service Disconnect is not
installed properly, correct the condition as
needed.

5087054

7. Remove the S15 Manual Service Disconnect (1).

Bulletin No.: 18-NA-225

August, 2019

Page 3

5087244

8. Test for less than 10 Ω across the S15 Manual
Service Disconnect fuse terminals (the flat blades
at each end). Refer to Testing for Continuity
in SI.
⇒ If the resistance measurement is 10 Ω or
greater, replace the S15 Manual Service
Disconnect.
9. Install the rear seat cushion.
Notice: Performing the Clear Secured High Voltage
DTCs procedure is part of the High Voltage
Enabling procedure.
10. Enable the high voltage system. Refer to High
Voltage Enabling in SI.

11. Upon completion of the Drive Motor Battery High
Voltage Manual Disconnect Lever Replacement,
perform the Diagnostic Repair Verification in SI.

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

Description

Labor Time

5030310

Drive Motor Battery
High Voltage Manual
Disconnect Lever
Replacement

Use Published
Labor
Operation Time

Version Information
Version

2

Modified

Released July 10, 2018
August 08, 2019 – Added all of MY2017 and added MY2018-2019 vehicles and removed
the Build Date Breakpoint Information stating: from MY2017 SORP to August 31, 2017.

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.

WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION