End Transmission Headaches and Get Back on the Road
Are you tired of your vehicle’s unpredictable, harsh shifting, or the constant anxiety of seeing the check engine light? A failing Transmission Control Module (TCM) can turn a reliable daily driver into a source of stress, leaving you stuck in limp mode or guessing what’s wrong. This genuine GM T42 TCM, service part 24255280, is the definitive solution. We pre-program it to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a seamless, plug-and-play installation. Restore the smooth, reliable performance your GM vehicle was built for.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty TCM is the likely culprit. This module is designed to resolve these problems directly:
- Harsh, erratic, or delayed gear shifts
- Vehicle stuck in a single gear (limp mode)
- Illuminated Check Engine or Transmission warning lights
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults
- Failure to upshift or downshift properly
- Poor fuel economy and potential transmission overheating
Installing our Programmed 24255280 T42 TCM is the most effective way to correct these electronic failures and restore communication between your engine and transmission.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the module with your car’s VIN and the latest GM software before it ships. This ensures perfect communication and performance right out of the box—no extra programming required.
- ✔ Restores Smooth Shifting: By precisely managing shift points, torque converter lockup, and line pressure, this TCM brings back the crisp, predictable shifting you expect.
- ✔ OEM-Quality & Reliability: Built to strict General Motors standards, this module provides the durability and longevity needed for work trucks like the Silverado or family haulers like the Tahoe.
- ✔ Cost-Effective Repair: Avoid the high costs and scheduling hassles of a dealership service department. This is a straightforward DIY-friendly part that saves you time and money.
- ✔ Guaranteed Peace of Mind: This unit is backed by our one-year replacement warranty.
From the Mechanic’s Bay: “We see it all the time. A customer comes in with a transmission that’s shifting all over the place. They’ve been told they need a full transmission rebuild, costing thousands. More often than not, the real problem is a failed TCM. The transmission itself is mechanically fine, but the ‘brain’ is malfunctioning. Swapping in a pre-programmed module like this Programmed 24255280 T42 TCM is often the complete fix. It’s a 30-minute job that saves the customer a fortune and gets their vehicle running perfectly again. Don’t replace the whole transmission until you’ve checked its controller.”
Frequently Asked Questions
Is this module really ‘plug-and-play’?
Yes. Because we program the module to your vehicle’s specific VIN before shipping, it is ready for installation as soon as you receive it. Simply disconnect the battery, swap the old module for the new one, reconnect the battery, and you’re ready to go. No dealership visit is required.
How do I know if my TCM is the problem?
Common signs include erratic shifting, getting stuck in one gear (limp mode), and specific diagnostic codes like P0700 (Transmission Control System Malfunction). If you are experiencing these electronic symptoms, the TCM is the most probable cause of failure.
Where is the T42 TCM located on my vehicle?
The location varies by model but it is typically found in the engine compartment. Common locations include next to the battery, on the LH strut tower, under the air cleaner box, or on the RH side of the engine bay. Your vehicle’s service manual can provide the exact location.
Do I need to send my old part back?
No. We do not require a core charge for this part. You can keep or dispose of your old module at your convenience, making the process faster and more straightforward for you.
Will this fit my vehicle?
This T42 TCM fits a very wide range of 2006-2014 General Motors vehicles, including the Pontiac Montana, Chevy Silverado, GMC Sierra, Buick LaCrosse, Saturn Vue, and many more equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. Please refer to the detailed fitment list on this page to confirm compatibility.