Fix Your Truck’s Shifting Problems for Good
If you’re behind the wheel of a 2007-2013 GMC Sierra 1500, you know it’s a dependable workhorse. But when the transmission starts acting up—slamming into gear, refusing to shift, or throwing a check engine light—it can be incredibly frustrating. In my 20+ years as a technician, I’ve seen countless truck owners worry they’re facing a multi-thousand dollar transmission rebuild. More often than not, the real culprit is a faulty Transmission Control Module (TCM). This T42 module, part number 24234503, is the brain of your 4L60E, 4L65E, or 4L70E automatic transmission, and when it fails, your truck’s performance suffers dramatically.
This isn’t just a replacement part; it’s a complete solution. We pre-program each module to your truck’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless communication between the TCM, the engine computer, and the transmission itself. You get a true plug-and-play fix that restores factory shift points and resolves complex electronic issues without a mandatory, expensive trip to the dealership for programming. This is the definitive repair for your 2007-2013 Sierra 1500 TCM.
Case Study: The Sierra That Dodged a Rebuild
A customer brought in his ’09 Sierra 1500, convinced the transmission was shot. It was stuck in 3rd gear (limp mode) and shifting harshly when it did engage. He was quoted over $3,500 for a transmission replacement at another shop. I hooked up my scan tool and pulled a P0700 (Transmission Control System Malfunction) and a U0101 (Lost Communication with TCM). Instead of pulling the pan, I first checked the TCM. After swapping in a VIN-programmed module, all the codes cleared, and the truck shifted as smoothly as the day it left the factory. A 30-minute fix saved him thousands. This is why you always diagnose the electronics first.
Is Your Sierra Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission shutdown. It often starts with small, intermittent issues. If you’re experiencing any of the following, your 2007-2013 Sierra 1500 TCM is the most likely cause:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The truck is stuck in one gear, often called “limp mode.”
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inconsistent or no shifting, leading to poor acceleration and bad fuel economy.
- ✔ The torque converter failing to lock up at highway speeds.
A Straightforward Guide to TCM Installation
You don’t need to be a professional mechanic to install this part. With basic hand tools, you can have your truck back to normal in under 30 minutes. For the 2007-2013 Sierra 1500, the TCM is typically located right next to the battery in the engine bay.
- 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 near the battery. 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: Bolt the new, VIN-programmed module into place and securely reconnect the wiring harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reconnect the battery terminal. Start the truck and let it idle for a few minutes. If you have a basic scan tool, it’s a good idea to clear any stored DTCs, though the primary issues will be resolved by the new module.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this page is focused on the 2007-2013 Sierra 1500 TCM, it also fits the following models. Please verify your specific model and year.
- GMC: Sierra 1500/2500, Yukon, Yukon XL, Savana, Envoy, Canyon
- Chevrolet: Silverado 1500/2500, Tahoe, Suburban, Avalanche, Express, Colorado, Impala, Cobalt, HHR, Monte Carlo
- Cadillac: DTS
- Buick: LaCrosse, Lucerne, Rainier, Allure
- Pontiac: G5, G6, Grand Prix
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This module interchanges with part numbers: 24242391, 24252114, 24230461, 24234274, 24235340, 24235754, 24238856, and more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you time and money.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it.
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 correct programming.
Will this fix a P0700 code?
A P0700 is a general transmission fault code, meaning the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you’re also experiencing shifting problems, replacing the TCM is the most likely solution.