Is Your GM Vehicle Shifting Erratically or Stuck in Limp Mode?
There’s nothing more frustrating than a transmission that won’t cooperate. Whether you’re trying to get to a job site in your Silverado, or take the family on a trip in your Tahoe, unpredictable shifting, warning lights on the dash, and getting stuck in one gear (limp mode) can bring your day to a halt. These are classic signs of a failing Transmission Control Module (TCM). Instead of facing a costly and time-consuming trip to the dealership, take control of the repair with this professionally VIN-programmed T42 transmission control module.
Common Symptoms & Your Solution
A faulty TCM can cause a cascade of problems that are often misdiagnosed. If you’re experiencing any of the following, this module is the definitive solution you need:
- Harsh, delayed, or erratic gear shifts
- Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light or Transmission Warning Light is on
- Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults
- Failure to upshift or downshift properly
- Poor fuel economy and a feeling of lost power
- Complete loss of communication with the transmission
This expertly prepared programmed T42 transmission control module arrives ready to install, directly addressing the electronic failure at the heart of these issues and restoring your vehicle’s factory performance.
Features & Benefits
- ✔ Ready for Immediate Installation: We pre-program this module to your vehicle’s specific VIN using the latest GM software updates. This eliminates the need for expensive dealership tools or programming, making for a true plug-and-play repair.
- ✔ Restore Smooth, Reliable Shifting: Engineered to OEM specifications, this module precisely manages shift points, torque converter lockup, and line pressure, returning your transmission’s operation to its smooth and efficient factory state.
- ✔ Built for Durability: Constructed with high-quality components to withstand the harsh environment of the engine bay, ensuring long-term reliability for your work truck or daily driver. This unit is backed by our one-year replacement warranty.
- ✔ Guaranteed Compatibility: A direct replacement for a wide range of service numbers including 24252114, 24234503, 24230461, 24243921, and more, ensuring a perfect fit for dozens of GM models.
- ✔ No Core Charge, No Hassle: Keep your old part. We don’t require a core return, saving you the time, money, and inconvenience of shipping a core back.
From the Mechanic’s Bench: Why VIN Programming is Non-Negotiable
In our 20+ years of experience, we’ve seen countless transmission issues caused by improperly matched electronics. Simply installing a used or non-programmed TCM from another vehicle is a recipe for failure. The module won’t recognize your vehicle’s specific engine, tire size, or gear ratios, leading to immediate shifting problems and error codes. Our VIN programming service isn’t just a convenience; it’s a critical step that ensures every parameter within the programmed T42 transmission control module is perfectly aligned with your vehicle’s factory settings, guaranteeing a successful and lasting repair the first time.
Frequently Asked Questions
What happens if I install a TCM that isn’t programmed?
An unprogrammed TCM will not work correctly. Your vehicle will likely not shift out of first or second gear, will display a check engine light, and may not even start. Our VIN programming service ensures the module is a perfect electronic match for your specific vehicle.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a straightforward installation. The TCM is typically located in the engine compartment and held in by a few bolts. The most important steps are to disconnect the battery before you begin and to ensure the electrical connectors are securely reattached. The entire process often takes less than 30 minutes.
How do I know for sure my TCM is the problem?
While the symptoms listed are strong indicators, a proper diagnosis with a quality scan tool is the best way to confirm. Look for communication errors with the TCM or specific transmission solenoid circuit codes (like P0751, P0756, etc.). If the transmission fluid is clean and at the correct level, and there are no major mechanical noises, the TCM is a very likely culprit.
Does this part require a “relearn” procedure after installation?
Because this is a fully programmed T42 transmission control module, a complex relearn procedure is not typically required. After installation, we recommend clearing any stored trouble codes with a scan tool. The module will then adapt to your driving style over the first 50-100 miles of normal operation.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the module. You can typically find the VIN on your driver’s side door jamb sticker, your vehicle’s registration, or on the dashboard viewable through the windshield.