Restore Your Sierra’s Shifting Performance
If you’re dealing with a GMC Sierra that’s shifting harshly, getting stuck in gear, or throwing transmission codes, you’re not alone. After 20 years in the business, I’ve seen countless trucks come into the bay with these exact issues, and more often than not, the culprit is a failing Transmission Control Module (TCM). Your 2007-2013 Sierra 1500 is a workhorse, and it deserves a transmission that shifts smoothly and reliably. This T42 TCM, part number 24235754, is the definitive solution to get your truck back to factory-spec performance without a costly trip to the dealership.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, it can cause a cascade of problems that feel like a major mechanical failure. But the fix is often much simpler. We take the guesswork and high cost out of the equation by pre-programming this module to your truck’s specific VIN. This means it arrives ready for a true plug-and-play installation, restoring crisp shifts and reliable operation right out of the box.
Case Study: A Tricky Diagnosis
A customer brought in his ’08 Sierra 1500, complaining it was stuck in what felt like third gear (limp mode) and the check engine light was on. His local shop quoted him for a full transmission rebuild. I pulled the codes and saw a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of tearing into the transmission, I checked the TCM. After seeing no obvious wiring damage, I knew from experience that the internal logic had likely failed. We swapped in one of these VIN-programmed modules, cleared the codes, and the truck was shifting perfectly in under an hour. It saved the customer thousands and solved the root problem.
Is Your Sierra Exhibiting These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2007-2013 Sierra 1500 TCM problems:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults are present.
- ✔ Complete failure to upshift or downshift.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission seems to be overheating for no reason.
Plug-and-Play Installation: Get Back on the Road Fast
One of the best features of this module is that it doesn’t require a professional mechanic for installation. With basic hand tools, most DIYers can complete this job in their driveway in about 30 minutes. For the GMT900 trucks like your Sierra, the process is very straightforward.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- Locate the TCM: On most 2007-2013 Sierra 1500 models, you’ll find the TCM in the engine bay, mounted right next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. There may be locking tabs you need to release. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. While the battery disconnect often clears codes, it’s best practice to use a basic OBD2 scan tool to clear any stored DTCs from the system. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235754 and other interchangeable numbers. It fits a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E, 4L80E). While this page focuses on the 2007-2013 Sierra 1500 TCM, it is also compatible with the following models:
ALLURE 06-09, AVALANCHE 1500 07-08, AURA 07-09, CANYON 08-12, COBALT 06-10, COLORADO 08-12, DTS 06-11, ENVOY 06-09, EXPRESS VANS 06-14, G5 07-10, G6 06-10, GRAND PRIX 06-08, HHR 06-11, HUMMER H3 08-10, IMPALA 06-11, ION 06-07, LACROSSE 06-09, LUCERNE 06-11, MALIBU 06-10, MONTE CARLO 06-07, MONTANA 06-09, PURSUIT 06, RAINIER 06-07, RENDEZVOUS 06-07, SAAB 9-7X 06-09, SAVANA VANS 06-14, SIERRA PICKUPS 07-13, SILVERADO PICKUPS 07-13, SSR 05-06, SUBURBAN 1500 07-08, TAHOE 07-09, TERRAZA 06-07, TRAILBLAZER 06-09, UPLANDER 06-09, VUE 07-10, YUKON 07-09, YUKON XL 1500 07-08. Please verify your specific model and options before ordering.
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This module is delivered to you pre-programmed to your vehicle’s VIN. This makes it a true plug-and-play part, saving you the time and expense of a dealership visit.
What is the warranty on this part?
We stand behind our parts with a one-year, hassle-free warranty. This ensures you’re getting a reliable component built to OEM standards for long-lasting performance.
Is there a core charge for my old TCM?
No, there is no core charge. You can keep your old part or recycle it locally without the hassle of shipping it back to us.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause, and replacing it with this module will resolve the issue and allow the code to be cleared permanently.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure proper programming.