File in Section:

Service Bulletin

Bulletin No.:
Date:

08 - Body and Accessories
07-08-42-006H
November, 2012

INFORMATION
Subject:

Information on Available BCM Calibrations to Restore Bulb Outage Detection on
Vehicles Produced by a Second Stage Manufacturer (Upfitter), Turn Signals Flash
Fast after Factory Box Removed

Models:

2007-2013 Chevrolet Silverado
2007-2013 GMC Sierra

This bulletin is being revised to clarify the only bulb outage detection option that is available
to the 1500 Series trucks. Please discard Corporate Bulletin Number 07-08-42-006G
(Section 08 – Body and Accessories).

•

The information contained in this bulletin applies
only to 2500 and 3500 Series trucks that are to be
completed by a second stage manufacturer
(upfitter) and may need to have the Body Control
Module (BCM) rear turn signal bulb outage
detection capability changed.
• 1500 Series trucks only have Option #1 available.
Production vehicles will be manufactured with one
of the following BCM rear turn signal bulb outage
detection software options:
Notice: Option #1 is the only option available for
1500 Series trucks.
1. A standard production vehicle will have BCM
software that checks for two bulbs functioning in
each rear turn signal bulb circuit. If one or more
bulbs are inoperative, the BCM will “fast flash” the
Instrument Panel Cluster (IPC) turn signal indicator
as required by Federal Motor Vehicle Safety
Standard (FMVSS) 108 and Canada Motor Vehicle
Safety Standard (CMVSS) 108.
Notice: Option #2 is available for 2500 and 3500
Series trucks.
2. Certain 2500 and 3500 models can be ordered with
a new option (RPO 9U5) where the BCM checks
for one bulb functioning in each rear turn signal
bulb circuit. If the bulb goes inoperative, the BCM
will “fast flash” the Instrument Panel Cluster (IPC)
turn signal indicator as required by Federal Motor
Vehicle Safety Standard (FMVSS) 108 and
Canada Motor Vehicle Safety Standard
(CMVSS) 108.

Copyright 2012 General Motors LLC. All Rights Reserved.

Notice: Option #3 is available for 2500 and 3500
Series trucks.
3. 2500 and 3500 models built with a pickup box
delete or chassis cab option (RPO ZW9) will be
produced with a BCM program that has no turn
signal bulb outage detection capability (LED
compatible). The IPC turn signal indicator will flash
at the same rate no matter how many turn signal
bulbs are inoperative.
In some cases, for 2500 and 3500 models only, the
upfitter may wish to change the turn signal bulb outage
detection capability so that the turn signals work
correctly with their upfit or to meet certain requirements.
This will require contacting the Techline Customer
Support Center (TCSC) (1-800-828-6860 English or
1-800-503-3222 French) to open a case and obtain a
Vehicle Configuration Index (VCI) number. Advise the
TCSC consultant which turn signal bulb outage
detection capability is needed from the following list:
1. Factory standard production TWO bulb outage
detection.
Notice: Only available on certain Model Year
2007-2013 2500 AND 3500 Series vehicles.
2. Optional (RPO 9U5) ONE bulb outage detection.
3. NO bulb outage detection (LED compatible).
The BCM can then be reprogrammed with the correct
software.

Page 2

Warranty Information
For vehicles repaired under warranty, use:

November, 2012

Bulletin No.: 07-08-42-006H

Labor
Operation

N4808

Labor
Time

Description
Body Control Module –
Reprogramming with SPS

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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Published
Labor
Operation
Time

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