Restore Peak Transmission Performance to Your GM Truck
When your GMC Sierra 2500’s transmission starts hesitating, shifting harshly, or throwing codes, your entire workday can grind to a halt. A failing Transmission Control Module (TCM) is often the culprit, causing frustrating and unpredictable behavior. This genuine GM T42 TCM, service number 24239926, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership visits and ensures a seamless, plug-and-play installation, getting your hard-working truck back on the road with the reliability you depend on.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty TCM is the likely cause. This module is engineered to resolve these problems directly:
- Harsh, erratic, or delayed gear shifts
- Vehicle stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light or Transmission Warning Light is on
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes
- Failure to upshift or downshift properly
- Noticeable decrease in fuel economy
Installing our VIN Programmed 24239926 T42 TCM is the most effective way to restore crisp, accurate shifting and clear persistent fault codes, ensuring your transmission operates exactly as the factory intended.
Features & Benefits
- ✔ Plug-and-Play Installation: This module is professionally programmed to your vehicle’s VIN number before shipping. This means no extra trips to the dealer for costly programming—just install it and go.
- ✔ Restores Smooth Shifting: By precisely controlling shift points, line pressure, and torque converter lockup, this TCM eliminates harsh engagements and gear slipping for a smoother ride.
- ✔ Solves Annoying Warning Lights: Engineered to correct the internal electronic faults that trigger common transmission-related DTCs and check engine lights.
- ✔ Built to OEM Standards: Manufactured to meet or exceed strict General Motors specifications, ensuring long-lasting durability and performance you can count on for towing, hauling, or daily driving.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
From the Mechanic’s Bay: In my 20 years of working on GM trucks, I’ve seen countless owners waste time and money chasing transmission problems. They replace solenoids and sensors, only to find the root issue was the TCM all along. The key is the programming. A generic module won’t communicate correctly with the other computers in your truck. This VIN Programmed 24239926 T42 TCM takes the guesswork out of the repair. It’s the difference between a quick, successful fix and a frustrating comeback job.
Frequently Asked Questions
Will this module require any additional programming after installation?
No. We program the module to your vehicle’s specific VIN before it ships. This makes it a true plug-and-play part, ready for installation right out of the box without needing a trip to the dealership or a specialized scan tool for programming.
Where is the T42 TCM located on my 2007 Sierra 2500?
On the 2007 ‘new style’ Sierra 2500, the TCM is typically located in the engine compartment, right next to the battery. Always disconnect the battery’s negative terminal before beginning the replacement to ensure safety and help reset the vehicle’s electronic systems.
Is this part difficult to install myself?
For someone with basic mechanical skills, the installation is straightforward and usually takes less than 30 minutes. It involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then reversing the process with the new one. No specialized tools are required.
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 perfect programming and compatibility.
What happens if I don’t replace a failing TCM?
Ignoring a failing TCM can lead to more severe and costly transmission damage. Continued erratic shifting can cause excessive wear on internal components like clutches and bands, potentially leading to a complete transmission failure that requires a full rebuild or replacement.
Is there a core charge for this part?
No, there is no core charge for this transmission control module. You can keep your old part without the hassle of returning it.