File in Section:
Bulletin No.:

Service Bulletin

Date:

15-NA-062
November, 2015

TECHNICAL
Subject:

Malfunction Indicator Lamp (MIL) ON, No Start, Blown Fuses, Electronic Brake Control
Module (EBCM) Body Wiring Harness Chafing on Transmission Mounting Bolt

Attention: This PI also applies to vehicles exported to Mexico.
Brand:

Model:

Chevrolet

Volt

Model Year:

VIN:

from

to

from

to

2016

—

—

—

Engine:

Transmission:

All

All

Condition

Some customers may comment the malfunction indicator lamp (MIL) is ON, multiple
diagnostic trouble codes (DTC) are set, the vehicle may not start, and/or have blown
fuses. The harness branch to the EBCM may be damaged from abrasion.

Cause

The EBCM body wiring harness offset clip may not be positioned correctly, allowing the
harness to rub on the transmission mounting bolt.

Correction

Service Procedure:

Perform underhood EBCM harness inspection for
damage, reposition harness, or repair harness if
needed.

4299096

1. Open the hood and locate the electronic brake
control module (EBCM) harness branch down
behind the radiator surge tank, near the brake
pressure modulator valve (BPMV) and frame/strut
tower.

Copyright 2015 General Motors LLC. All Rights Reserved.

Page 2

November, 2015

Bulletin No.: 15-NA-062

4310627

Caution: Loosen surge tank filler cap slightly to relieve
pressure before removing hoses.
4. Clamp off and remove both small upper radiator
surge tank hoses (1).

4299101

2. Inspect the body harness for a minimum 10 mm
clearance (1) from the edge of bolt heads or clips.
The Body Harness clip (2) must be at a 90 degree
angle from the frame and not clocked toward the
front of the vehicle.
• If no interference or harness damage noticed,
refer to Diagnostic Starting Point - Vehicle in SI.
• If interference or harness damage noticed,
proceed to step 3, and refer to Wiring Repairs in
SI for damaged wiring.
3. Disconnect the 12 V battery. Refer to Battery
Negative Cable Disconnection and Connection
in SI.

4310607

5. Remove the radiator surge tank retaining clip (1),
and relocate the tank for access to the harness
location. Refer to Radiator Surge Tank
Replacement in SI.

Bulletin No.: 15-NA-062

November, 2015

Page 3

4299100

6. Relocate, or slide up, the braided cover on the
adjacent brake line for a better view of the body
harness contact area.

4299103

Note: Leave the upward curved part of the harness clip
intact for harness support.
9. Cut the upper part of the tie strap (1) fastening the
body harness to the frame mounting clip.
10. Move the body harness away from the frame and
clip to access the clip mounting nut.
11. Remove the barrel connector from the top of the
harness clip stud.
12. Remove the harness clip nut from the stud.
Tip: Use a stubby 10 mm wrench or flex-head
ratcheting wrench.

4084513

7. Remove the upper body mounting bolt (1) from the
brake pressure modulator valve (BPMV) clip (2).
Caution: Do not move the BPMV to the point of
stressing or bending the brake lines.
8. The BPMV can be moved slightly to provide
clearance/access to the harness clip.

4299104

13. Remove the harness clip (1) from the vehicle.

Page 4

November, 2015

Bulletin No.: 15-NA-062

19. Install a second tie strap (1) to the harness
securing it to the nearby black rectangular clip (2).
Trim off the excess.
20. Reposition the braided brake line cover.

4299106

14. Insert a suitable heavy duty tie strap (1) through
the rectangular slot in the clip, do not fasten.
15. Install the clip with tie strap to the mounting stud on
the vehicle.
Tip:
Use a magnetic extended tool to position nut on stud.
16. Install the clip nut and tighten the clip down to
9 Nm (80 in lbs)
Important: Ensure the clip is 90 degrees, straight out
from the frame. Use a suitable tool to hold the clip from
turning during installation.
17. Install the barrel connector to the top of the
harness clip stud.
18. While holding the EBCM body harness branch in
position with maximum all around clearance,
secure the tie strap to the harness. Trim off the
excess.

4084513

21. Reposition the brake pressure modulator valve
(BPMV) and install the upper body mounting
bolt (1).

Tighten
Tighten the bolt to 22 Y (16 lb ft).

4310627

22. Reposition the coolant surge tank and reconnect
both small upper hoses.
23. Install the coolant reservoir mounting clip.

4299108

Bulletin No.: 15-NA-062

November, 2015

Page 5

Warranty Information
Labor
Operation

Description

Labor Time

5480188*

Inspect and Repair
EBCM Harness Clip,
Add Additional Tie
Strap

1.0 hr

5480198*

Inspect and Repair
EBCM Harness Clip,
Add Additional Tie
Strap, Misc. Wiring
Repair

1.5 hrs

*This is a unique Labor Operation for Bulletin use only.

Version

1

Modified

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