Get Your Sierra Shifting Smoothly Again
If you’re dealing with a transmission that’s acting up in your 2007 GMC Sierra 2500, you’re not just facing an annoyance—you’re facing potential downtime for a truck that needs to work. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring a powerful truck to its knees. This T42 TCM, part number 24235754, is the definitive solution to get your truck’s transmission back to factory-spec performance without the hassle or expense of a dealership visit.
This isn’t just a replacement part; it’s a complete fix. We pre-program it to your truck’s specific Vehicle Identification Number (VIN) before it ships. This means when it arrives, it’s ready for a true plug-and-play installation. The module will have the latest GM software updates, ensuring it communicates flawlessly with your engine and transmission, correcting harsh shifting, eliminating limp mode, and restoring the crisp, reliable gear changes you depend on. This is the exact approach I take in my own shop to guarantee a lasting repair and a happy customer.
Real-World Repair Story
Real-World Repair Story
A contractor brought his ’07 Sierra 2500 into my bay, completely frustrated. The truck was stuck in 3rd gear (limp mode) and the check engine light was on with a P0700 code. He was worried about a costly transmission rebuild. After a quick scan, I suspected the TCM. Instead of a multi-day, thousand-dollar transmission job, we swapped in a VIN-programmed T42 module. In less than an hour, the codes were cleared, the truck was shifting perfectly, and he was back on his way to the job site. This simple part saved him a massive headache and significant downtime.
Is Your Truck Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of these, this module is likely the solution for your 2007 Sierra 2500 TCM issues.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Transmission stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750, or other solenoid-related faults.
- ✔ A sudden drop in fuel economy or the transmission overheating.
- ✔ Complete loss of communication with the transmission.
DIY Installation: Get Your Sierra Back to Work
One of the best features of this module is its straightforward installation. You don’t need specialized equipment, just basic hand tools. For most GMT900 trucks like yours, the process is quick and easy.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On your 2007 Sierra 2500, the TCM is typically located in the engine bay, right next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You’ll hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. Start the truck and let it run for a minute. While the module is pre-programmed, it’s good practice to use a basic scan tool to clear any old fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235754 and other service numbers. While this page is focused on the 2007 Sierra 2500 TCM, it also fits a wide range of other GM vehicles. Please verify your model and options below:
- SIERRA 2500 PICKUP 07: Fits new style (smooth door skin), 6.0L, (located next to battery)
- SILVERADO 2500 PICKUP 07: Fits new style (smooth door skin), 6.0L, (located next to battery)
- CHEVROLET & GMC VANS (EXPRESS, SAVANA) 06-14: (RH engine compartment)
- CHEVROLET & GMC 1500 TRUCKS/SUVS (SILVERADO, SIERRA, TAHOE, YUKON, AVALANCHE, SUBURBAN) 07-13: (next to battery)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please check the full list provided in the initial data to confirm your specific application.
What does ‘VIN Programmed’ mean?
Real-World Repair Story
A contractor brought his ’07 Sierra 2500 into my bay, completely frustrated. The truck was stuck in 3rd gear (limp mode) and the check engine light was on with a P0700 code. He was worried about a costly transmission rebuild. After a quick scan, I suspected the TCM. Instead of a multi-day, thousand-dollar transmission job, we swapped in a VIN-programmed T42 module. In less than an hour, the codes were cleared, the truck was shifting perfectly, and he was back on his way to the job site. This simple part saved him a massive headache and significant downtime.