Restore Flawless Shifting to Your GM Truck
If your 2007 GMC Sierra 2500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem often lies with a faulty Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change, torque converter lockup, and pressure regulation. When it fails, it can mimic the symptoms of a major mechanical failure, leading to costly and unnecessary repairs. This OEM-quality T42 TCM, part number 24235732, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play fix.
A Technician’s Notebook: The Ghost in the Transmission
I remember a 2007 Sierra 2500 with the 6.0L that came into my bay a few years back. The owner was frustrated, having already replaced two shift solenoids at another shop. The truck would shift perfectly for a week, then suddenly start banging into gear and throw a P0750 code. After hooking up my scanner and monitoring live data, I saw erratic command signals coming from the TCM. The solenoids were fine; the module giving the orders was the issue. We installed a VIN-programmed TCM, and the truck has been shifting smoothly ever since. It’s a classic case where diagnosing the electronics first saves hundreds on unnecessary hard part replacements.
Is Your Sierra Exhibiting These Telltale Signs?
A failing TCM can cause a wide range of problems. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Abrupt, harsh, or delayed gear shifts.
- ✔ The vehicle feels stuck in one gear (often called “limp mode”).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid errors), or other transmission-related codes.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip or fails to engage properly from a stop.
Why VIN Programming is a Game-Changer for Your Repair
The single biggest hurdle in replacing modern electronic modules is programming. Traditionally, you’d have to install the part and then have your truck towed to a dealership for an expensive programming session. Our process eliminates that entirely. We flash this 2007 Sierra 2500 TCM with the latest GM software calibrated specifically to your vehicle’s VIN before it ships. This ensures perfect communication with the Engine Control Module (ECM) and other vehicle systems, restoring original performance and shift patterns right out of the box. No extra tools, no dealer visits, no hidden fees.
A Straightforward Guide to Installation
You can have your truck back to normal in under 30 minutes with basic hand tools. For the 2007 Sierra 2500, the TCM is conveniently located right next to the battery in the engine compartment.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Find the TCM mounted next to the battery tray. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed module in the same location. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scanner to clear any stored fault codes from the previous issue.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235732 and is interchangeable with other service numbers like 24252114, 24234503, and more. While this page is focused on the 2007 Sierra 2500 TCM, it also fits a massive range of GM vehicles from 2006-2014, including:
- Chevrolet Silverado, Tahoe, Suburban, Express, Impala, Cobalt, HHR
- GMC Yukon, Sierra, Savana, Envoy
- Buick LaCrosse, Lucerne, Allure
- Cadillac DTS
- Pontiac G6, Grand Prix
- Saturn Vue, Aura, Ion
- Hummer H3 & Saab 9-7X
Frequently Asked Questions
What does a VIN-programmed TCM actually mean for me?
It means the module arrives ready for installation with no further steps required. We load your vehicle’s specific software onto the module so it works seamlessly with your engine and transmission, avoiding the need for a dealership visit.
Do I need any special tools to install this part?
No. Basic hand tools like a socket set are all you need. The most important part of the process is ensuring the battery is disconnected before you begin.
Where is the TCM located on my 2007 Sierra 2500?
On the 2007 Sierra 2500 (new body style), the Transmission Control Module is located in the engine bay, mounted right next to the battery.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal short circuits causing solenoid codes), you should always diagnose any accompanying codes (e.g., P0750, P0755) to confirm the TCM is the source. In many cases, it is.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of shipping it back.