13240

GM Bulletin No.: 13240
Date: July 2013
Service Bulletin
SERVICE UPDATE
SUBJECT:
Service Update for Inventory and Customer Vehicles
Loss of Power Steering Assist at Extreme Hot and Cold Underhood
Temperatures
Expires with Base Warranty
MODELS:
2014 Chevrolet Silverado
2014 GMC Sierra
This service update includes vehicles in dealer inventory and customer vehicles that
return to the dealership for any reason. This bulletin will expire at the end of the involved
vehicle's New Vehicle Limited Warranty period.
PURPOSE
This bulletin provides a service procedure to reprogram the power steering control module on
certain 2014 model year Chevrolet Silverado and GMC Sierra vehicles. The power steering
control module may disable the power steering assist feature. This is most likely to occur when
the vehicle is first started and when the underhood temperature is extremely low, although in
very rare instances, it may occur if the underhood temperature is extremely high. This could
result in increased steering effort at low vehicle speeds, the display of a Service Power Steering
DIC message, and the setting of DTC C056D. Power steering assist will return on subsequent
ignition cycles if the underhood temperatures are no longer in these ranges.
This service procedure should be completed as soon as possible on involved vehicles
currently in dealer inventory and customer vehicles that return to the dealer for any type
of service during the New Vehicle Limited Warranty coverage period.
VEHICLES INVOLVED
All involved vehicles are identified by VIN in the Global Warranty Management System –
Investigate Vehicle History Application. Dealership technicians should always check this site to
confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is
important to routinely use this tool to verify eligibility because not all similar vehicles may be
involved regardless of description or option content.
Additionally, a list of involved vehicles currently in dealer inventory is available on the “Service
Update Bulletin Information” link under the “Service” tab in GM GlobalConnect (US) or attached
Copyright 2013 General Motors. All Rights Reserved.
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July 2013
Bulletin No.: 13240
to the GlobalConnect message (Canada) used to release this bulletin. Customer vehicles that
return for service, for any reason, and are still covered under the vehicle's base warranty should
also be checked for vehicle eligibility.
PART INFORMATION
No parts are required for this update.
SERVICE PROCEDURE

DO NOT program a control module unless directed to by a service procedure or a service
bulletin. If the control module is not properly configured with the correct calibration
software, the control module will not control all of the vehicle features properly.

Do NOT attempt to order the calibration number from GM Customer Care and Aftersales.
The calibration numbers required for this service procedure are programmed into control
modules via a Multiple Diagnostic Interface (MDI) with the calibration update. Use
TIS2WEB on or after July 24, 2013, to obtain the calibration. If you cannot access the
calibration, call the Techline Customer Support Center and it will be provided.

Ensure the programming tool is equipped with the latest software and is securely
connected to the data link connector. If there is an interruption during programming,
programming failure or control module damage may occur.

Stable battery voltage is critical during programming. Any fluctuation, spiking, over
voltage or loss of voltage will interrupt programming. When required install the EL-49642
SPS Programming Support Tool 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.

Turn OFF or disable systems that may put a load on the vehicles battery such as; interior
lights, exterior lights (including daytime running lights), HVAC, radio, etc.

During the programming procedure, follow the SPS prompts for the correct ignition switch
position.

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the
Inspection/Maintenance (I/M) system status indicators to NO.
To program an existing power steering control module, perform the following procedure:
1. Install EL-49642 SPS programming support tool.
2. Ignition ON.
3. Reprogram the Power Steering Control Module. Refer to SI and Service Programming
System (SPS) documentation for programming instructions, if required.
3.1 Access the Service Programming System (SPS) and follow the on-screen instructions.
3.2 On the SPS Supported Controllers screen, select K 43 Power Steering Control Module
---Programming and follow the on-screen instructions.
4. At the end of programming, choose the “Clear All DTCs” function on the SPS screen.
5. With a scan tool, clear All DTCs.
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July 2013
Bulletin No.: 13240
WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZFAT
transaction type, unless noted otherwise.
Labor
Code
9100105
Description
Reprogram Power Steering Control Module
Labor
Time
0.3
DEALER PROGRAM RESPONSIBILITY
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your
facility for service in the future, and the vehicle is still covered under the New Vehicle Limited
Warranty, you must take the steps necessary to be sure the service update correction has been
made before selling or releasing the vehicle.
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 tools,
equipment, 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 dealer for information on whether your vehicle may benefit from the information.
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