Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2013SIERRA 2500 2WD V8-6.6L DSL TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSRELAYS AND MODULES - TRANSMISSION AND DRIVETRAINRELAYS AND MODULES - A/TCONTROL MODULETESTING AND INSPECTIONALLISON - AUTOMATIC TRANSMISSION
2013 GMC Sierra 2500 2WD V8-6.6L DSL Turbo
Allison - Automatic Transmission
2013 GMC Sierra 2500 2WD V8-6.6L DSL TurboSECTION Allison - Automatic Transmission
Transmission Control Module Programming and Setup (Allison)
The following service procedures require a programming and a setup event be performed for a complete repair.
Transmission Control Module (TCM) Replacement
If the TCM is replaced, TCM Reprogramming must be performed. Refer to Service Programming System (SPS) Service Programming System (SPS).
TCM Reprogramming
If programming is required, perform the following procedure. Refer to Service Programming System (SPS) Service Programming System (SPS).
Ensure the following conditions exist in order to prepare for TCM programming or reprogramming:
* The battery is fully charged.
* The ignition switch is in the RUN position.
* Ensure that the TCM has the latest software version.
* The Techline equipment cable connection at the data link connector (DLC) is secure.
* Inspect the Techline equipment for the latest software version.
Program the TCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user instructions.
If the TCM fails to program, proceed as follows:
* Ensure the TCM connection is good.
* Inspect the Techline equipment for the latest software version.
* Attempt to program the TCM. If the TCM still cannot be programmed properly, replace the TCM.
TCM Setup
Refer to FastLearn Procedure Programming and Relearning to complete repair.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.