Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 GMC Savana 1500 exhibiting signs of transmission trouble? Unpredictable shifting, getting stuck in gear, or an illuminated check engine light can turn a reliable work van into a source of constant frustration. The Transmission Control Module (TCM) is the electronic brain of your automatic transmission, responsible for orchestrating every gear change with precision. When it fails, the symptoms can range from merely annoying to completely disabling. This OEM-quality T42 TCM, service part 24239926, is the definitive solution to restore the smooth, reliable operation you depend on.
Unlike generic or non-programmed modules that require expensive trips to the dealership for coding, this unit arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication with your vehicle’s other control units, like the Engine Control Module (ECM), right out of the box. By installing a VIN-programmed module, you are ensuring that all factory shift points, torque converter lockup strategies, and diagnostic parameters are perfectly matched to your Savana 1500, providing an immediate and lasting fix.
From the Diagnostic Bay
We had a 2009 Chevy Express van come in that was a classic case of TCM failure. The owner, a local contractor, said it would intermittently slam into gear and then get stuck in what felt like third gear (limp mode). He couldn’t rely on it for his business. We scanned it and pulled a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of chasing down individual solenoids inside the transmission, experience pointed us to the external T42 module. We ordered one of these VIN-programmed units, and the installation took less than 20 minutes in the engine bay. After connecting the battery and clearing the codes, the van shifted perfectly on the test drive. The customer was back on the road the same day without the downtime and expense of a dealership visit. This part truly is a plug-and-play problem solver.
Symptoms Your T42 TCM is Failing
A failing transmission module can manifest in various ways. If you’re experiencing any of the following issues with your Savana, Tahoe, Silverado, or other compatible GM vehicle, a faulty TCM is the likely culprit. This module is engineered to resolve these exact problems.
- ✔️ Harsh or Erratic Shifting: Abrupt, jerky, or delayed gear changes that make driving uncomfortable and unpredictable.
- ✔️ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔️ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔️ Diagnostic Trouble Codes (DTCs): Common codes include P0700, P0750, P0753, P0758, and other solenoid-related faults.
- ✔️ No Upshift or Downshift: The transmission fails to shift to higher or lower gears as needed, causing poor acceleration and high RPMs.
- ✔️ Poor Fuel Economy: Inefficient shifting and torque converter operation lead to a noticeable decrease in miles per gallon.
Why Choose a VIN-Programmed 2006-2014 Savana 1500 TCM?
The key to a successful repair is compatibility. This module is not just a part; it’s a complete solution. By programming it with the latest GM software updates specific to your VIN, we eliminate the guesswork and additional costs associated with post-installation programming. It’s built to meet or exceed original equipment standards, ensuring long-lasting durability and performance. This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, and more, making it a versatile fix for dozens of GM models equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 Transmission Control Module (TCM) is a small computer that acts as the central command for your vehicle’s automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) and uses this information to control shift solenoids, manage hydraulic pressure, and engage the torque converter clutch for optimal performance and fuel efficiency.
Is this module truly plug-and-play?
Yes. Because we pre-program the module to your vehicle’s specific VIN before shipping, it is ready for installation right out of the box. You will not need to take your vehicle to a dealership for additional programming, saving you significant time and money.
How do I know for sure that my TCM is the problem?
While the symptoms listed are strong indicators, the best way to confirm a faulty TCM is with a professional diagnostic scan tool. Look for codes like P0700 (a general transmission fault code) along with specific solenoid circuit codes. Intermittent electrical behavior and being stuck in limp mode are classic signs of a failing module.
Where is the TCM located on my 2008 GMC Savana?
On the 2006-2014 GMC Savana and Chevrolet Express vans, the T42 TCM is typically located in the engine compartment on the right-hand (passenger) side. Location can vary on other GM models, often found near the battery, on the LH strut tower, or under the air cleaner box.
Will this fit other GM vehicles besides the Savana 1500?
Absolutely. This T42 TCM is compatible with a vast range of 2006-2014 GM vehicles, including the Chevrolet Silverado, Tahoe, Impala, Cobalt; GMC Sierra, Yukon; Buick LaCrosse; Cadillac DTS; Pontiac G6; and Hummer H3, among many others. Please verify the part number or consult the fitment list to ensure it matches your specific model.