14126B Service Bulletin/Repair Instructions

GM Bulletin No.: 14126B

Date: September 2014
Service Bulletin
SERVICE UPDATE

SUBJECT:
Service Update for Inventory and Customer Vehicles

“Peek In” Odometer Display Incorrect

Expires with Base Warranty
MODELS:
2014 Chevrolet Silverado 1500

2015 Chevrolet Silverado 2500 and 3500

2014 GMC Sierra 1500

2015 GMC Sierra 2500 and 3500

2015 Chevrolet Suburban, Tahoe

2015 GMC Yukon
The service procedure has been revised to include new information about programming

the instrument panel cluster module. If programming fails and resetting attempts are

unsuccessful, do not replace the cluster. Refer to Step 5. Discard all copies of bulletin

14126A.

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 instrument panel cluster on certain

2014 model year (MY) Chevrolet Silverado 1500 series, 2015 MY Chevrolet Silverado 2500 and

3500 series, 2014 MY GMC Sierra 1500 series and 2015 MY GMC Sierra 2500 and 3500 series

vehicles. Also involved are certain 2015 MY Chevrolet Suburban, Tahoe and GMC Yukon

vehicles. These vehicles may have an odometer reading at “Peek In” (i.e. Driver Information

Center (DIC) screen when the vehicle is in the OFF POWER mode but the cluster is awakened

by opening the car door or using the key fob) does not match the season odometer reading when

the vehicle is in the RUN POWER mode. The Trip A/B and Fuel Economy displays may also be

incorrect. This condition occurs, when the vehicle sits for an extended period of time and, normal

parasitic current draws deplete the battery state of charge to less than 12 volts and, the vehicle is

in the OFF POWER mode when the cluster is awakened as described above.

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.

Copyright 2014 General Motors. All Rights Reserved.
Page 2
September 2014
Bulletin No.: 14126B
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 (U.S.) or attached

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.

SERVICE PROCEDURE

Note: Carefully read and follow the instructions below.


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. If you cannot access the

calibration, call the Techline Customer Support Center and it will be provided.

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.

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 prevent programming failure due to unintended wireless drops, it is important that a wired

MDI connection be used for the IPC updates.
1. Install EL-49642 SPS programming support tool. The MDI must be connected, wired by

USB or Ethernet.

2. Access the Service Programming System (SPS) and follow the on-screen instructions.
Page 3
September 2014
Bulletin No.: 14126B
3. On the SPS Supported Controllers screen, select Instrument Cluster – Programming, Setup

and Configuration and follow the on-screen instructions.

Note: It is mandatory to perform Step 3 (Instrument Cluster – Programming, Setup and

Configuration) before Step 4 (Instrument Cluster – USB File Transfer). These steps MUST be

done in order and completed, for the cluster to be fully functional. Reversing the order or

completing only one step, could cause the IPC screen and other features to work improperly (i.e.

DIC blank, backlighting off). Performing and completing Step 3 and 4 in order, will recover the

instrument cluster if the programming is done in the incorrect order. Do NOT replace the ECU.

Please follow the unsuccessful programming recovery procedure below.

4. Once step 3 has been completed, perform a USB File Transfer Procedure. This requires the

use of a USB memory stick. On the SPS Supported Controllers screen, select Instrument

Cluster – USB File Transfer and follow the on-screen instructions. Turn on the radio. When

prompted after installing files in vehicle via USB memory stick, select UPDATE on radio

display. When the update is complete, confirm completion by selecting DISMISS from the

display. After confirmation, make sure to remove the USB stick.

Note: Do NOT use the software on the USB stick for multiple vehicles. You must clear each USB

stick and download software from SPS for every USB programming event.

5. At the end of programming, choose the “Clear All DTCs” function on the SPS screen.

Unsuccessful Programming Recovery

If programming fails and resetting attempts are unsuccessful, do NOT replace the cluster. In the

event of unsuccessful programming event, perform the following steps:

1. Turn the ignition OFF, disconnect battery, and wait from 5-15 minutes.

2. Connect battery, turn the ignition ON and attempt to reprogram the IPC. Select Replace and

Program ECU instructions above.

If the IPC programming still cannot be completed, please contact the Techline Customer Support

Center (TCSC) at 1-800- 828-6860 (English), 1-800-503-3222 (French).

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

9100630
Description

Reprogram Instrument Panel Cluster
Labor

Time

0.7
Note: Submit module replacements using normal warranty labor operation codes.

DEALER PROGRAM RESPONSIBILITY

Dealers must take the steps necessary to ensure that the service update correction has been

made to all involved vehicles in dealer inventory before selling or dealer-trading the vehicle, but

no later than June 30, 2015.

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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