Is Your GM Vehicle Shifting Erratically or Stuck in Gear?
There’s nothing more frustrating than a transmission that won’t cooperate. Harsh shifts, delayed gear engagement, and a persistent check engine light can ruin your driving experience and cause serious concern about costly repairs. If your Chevrolet, GMC, or Buick is suffering from these symptoms, the problem often points directly to a failing Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s performance, safety, and fuel economy. Don’t let a faulty module dictate your drive—take control with a reliable, pre-programmed solution.
Common Symptoms & Your Solution
A failing TCM can manifest in several ways, turning your dependable daily driver into an unpredictable machine. If you’re noticing any of the following, it’s time to replace your module:
- Harsh or Erratic Shifting: Abrupt, jerky gear changes that make driving uncomfortable.
- Limp Mode Activation: The vehicle gets stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- Warning Lights: The Check Engine Light or a specific transmission warning is illuminated on your dash.
- Diagnostic Trouble Codes (DTCs): Your mechanic finds codes like P0700, P0750, or other solenoid-related faults.
- Poor Performance: A noticeable drop in fuel efficiency, delayed acceleration, or a complete failure to shift.
The definitive fix for these issues is our pre-programmed 24240449 T42 Transmission Control Module. It arrives ready to install, specifically coded to your vehicle’s VIN, eliminating the need for expensive dealership programming and getting you back on the road quickly and affordably.
Features & Benefits
- âś” Plug-and-Play Installation: This module is expertly programmed to your vehicle’s unique VIN. This means no extra trips to the dealer for expensive flashing or setup. Just install it, and you’re ready to go.
- âś” Restored Performance: By precisely managing shift points, torque converter lockup, and line pressure, this TCM restores the smooth, predictable operation you expect from your vehicle.
- âś” Solve Annoying Warning Lights: A new, correctly functioning 24240449 T42 Transmission Control Module is the direct solution for clearing persistent transmission-related DTCs and turning off that check engine light for good.
- âś” OEM-Standard Quality: Built to meet or exceed original equipment specifications, ensuring long-lasting durability and reliable performance for years to come.
- âś” This unit is backed by our one-year replacement warranty.
Expert Insight from the Shop Floor:
For over two decades, I’ve seen drivers chase expensive transmission repairs, replacing solenoids and sensors only to find the root cause was the TCM all along. The brain of the transmission is often the first point of failure. A key mistake DIYers make is forgetting to disconnect the battery before swapping the module. This simple step is critical; it forces the vehicle’s computer systems to reset and properly recognize the new, VIN-matched TCM, ensuring a seamless integration and preventing communication errors.
Whether you’re repairing a hard-working Silverado, a family-hauling Tahoe, or a daily-driving Impala, this 24240449 T42 Transmission Control Module is the smart, reliable choice. It’s engineered for a perfect fit across a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. Stop guessing and start driving with confidence again.
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means this module is a true plug-and-play solution. We use your vehicle’s VIN to load the latest factory software and calibrations directly onto the module before shipping. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, saving you a trip to the dealership for expensive programming.
Will this fix my P0700 transmission error code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700 and related solenoid codes, you should always confirm the diagnosis. If the TCM itself is faulty, replacing it with this unit is the correct solution.
Is this part difficult to install?
For most DIYers with basic tools, installation is straightforward and typically takes under 30 minutes. The TCM is usually located in an accessible spot in the engine compartment, such as next to the battery or under the air cleaner box. Simply disconnect the battery, unplug the old module, and plug in the new one.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle, making the repair process simpler and more convenient for you.
How do I know for sure that my TCM is failing?
Common signs include erratic shifting, the vehicle being stuck in limp mode, multiple transmission-related error codes, and intermittent electrical issues. If you experience a combination of these symptoms, a faulty TCM is the most likely culprit.
What vehicles is this module compatible with?
This T42 TCM fits a wide range of 2006-2014 GM vehicles, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; Buick LaCrosse; Cadillac DTS, and many others with 4-speed automatic transmissions. Please use the vehicle fitment tool on our website to confirm it is the correct part for your specific model.