17NA328 Service Bulletin/Repair Instructions

File in Section:

Bulletin No.:
Service Bulletin
Date:
17-NA-328

February, 2018
TECHNICAL

Subject:
Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0A0C, P0ABB, P0ABC, P0ABD,

P1AE6 and/or P1FFF Set
Brand:
Model:
Chevrolet
Bolt EV
Model Year:
VIN:
from
to
2017
2017
from
Engine:
Transmission:
to
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment that the MIL is illuminated.

The technician may find one or more of the following DTCs set:

• P0A0C: High Voltage System Interlock Circuit Low Voltage

• P0ABB: Hybrid/EV Battery Voltage Sensor Performance

• P0ABC: Hybrid/EV Battery Voltage Sensor Circuit Low Voltage

• P0ABD: Hybrid/EV Battery Voltage Sensor Circuit High Voltage

• P1AE6: Battery Energy Control Module Hybrid/EV Battery Voltage Isolation Sensor

Circuit

• P1FFF: System Isolation / Coolant Level Sensor Fault - Hybrid/EV Battery Charging

System Disabled
Cause
This condition may be caused by a set code in the Hybrid Powertrain Control Module 2

(HPCM2) in conjunction with a hardware fault in the Battery Energy Control Module.
Correction 1
Removing the MSD fuse may cause multiple DTCs to set along with P1AE6, most notably

P0A0C. Validate the MSD fuse is fully seated.

• If the issue persists and P1AE6 remains CURRENT (i.e. not ONLY in history), proceed

to correction 2.
Correction 2
With the vehicle in Ready Mode, with GDS2 under the HPCM2 module, compare the

Hybrid/EV Battery Voltage and the Hybrid/EV battery Voltage Sensor Average Voltage

and ensure the voltages are within 3V of each other (Note: Multiply the Hybrid/EV battery

Voltage Sensor Average Voltage by 96. That value should be within 3V of the Hybrid/EV

Battery Voltage).

• If High Voltage Battery Average Cell Voltage and Hybrid Battery Processed Voltage

ARE NOT within 3V of each other, verify the software in the HPCM2 is to the latest

calibrations, then proceed to correction 3.

Note: This situation should NOT result in a Battery Energy Control Module replacement

unless agreed to by TAC and/or GM Engineering.

• If High Voltage Battery Average Cell Voltage and Hybrid Battery Processed Voltage

ARE within 3V of each other, follow normal service procedures for P1AE6.
Correction 3
Copyright 2018 General Motors LLC. All Rights Reserved.
After the software in the HPCM2 has been updated to the latest calibrations:

1. Install a new Battery Energy Control Module.

2. After installation and programming of a new Battery energy Control Module, verify

P1AE6 and P0ABB do not return.

2.1. Turn the vehicle ON.

2.2. Turn the vehicle Off.

• Wait 1 minute to allow the vehicle to give active isolation time to run.

2.3. Turn the vehicle ON.

2.4. Validate if DTC P1AE6 has returned.

2.5. Repeat steps 2.1 - 2.4 a total of 2 more times.
Page 2
February, 2018
Bulletin No.: 17-NA-328
Service Procedure

Important: Stable battery voltage is critical during

programming. Any fluctuation, spiking, over voltage or

loss of voltage will interrupt programming. Install the

EL-49642 SPS Programming Support Tool (GM Dealer

Equipment Item #PSC-550) to maintain system voltage.

If not available, connect a fully charged 12 V jumper or

booster pack disconnected from the AC voltage supply.

DO NOT connect a battery charger.

Refer to Hybrid Powertrain Control Module 2

Programming and Setup in SI.

Refer to Battery Energy Control Module Replacement

in SI.
Parts Information

Causal

Part
Description
Part

Number
Qty
N/A
MODULE, BAT

ENGY CONT (W/

O CALN &

OPERG SYS)
24284196
1
Warranty Information

For vehicles repaired under warranty, use:

Labor

Operation
Description
Labor Time
2810265
Hybrid Powertrain Control

Module 2 Reprogramming

with SPS
5031010
Battery Energy Control

Module Replacement
Use

Published

Labor

Operation

Time
Version
3
Modified
Released October 12, 2017

November 21, 2017 – Removed Ampera-e from Model section and added Battery Energy

Control Module information.

February 22, 2018 – Added additional DTCs and updated Correction sections

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.
WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION

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