Restore Peak Transmission Performance in Your GM Vehicle
If your 2006-2014 GMC Savana 2500 is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light with transmission codes, a failing Transmission Control Module (TCM) is the likely culprit. This T42 TCM, service number 24234503, is the definitive solution to restore the precise, smooth operation your vehicle had when it was new. As the electronic brain of your 4L60E, 4L65E, or 4L80E automatic transmission, this module governs every shift point, torque converter clutch engagement, and line pressure adjustment. A faulty module can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed.
Expert Pro Tip
Before installing your new TCM, always disconnect the vehicle’s battery for at least 15 minutes. This not only ensures your safety but also helps clear any learned adaptive values from the old, failing module. After installation, use a quality OBD2 scan tool to clear any stored Diagnostic Trouble Codes (DTCs) to give the system a fresh start.
Symptoms of a Failing T42 TCM
A failing transmission computer can manifest in several ways. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Erratic Shifting: Abrupt, harsh, or delayed gear changes during acceleration or deceleration.
- ✔ Limp Mode Activation: The vehicle may refuse to shift out of a single gear (often 2nd or 3rd) to protect the transmission.
- ✔ Warning Lights: A persistent Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes: Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (e.g., P0750, P0751).
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can lead to a noticeable drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM at all.
Why Choose Our Programmed Savana 2500 T42 TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The single most critical benefit is our complimentary VIN programming service. We flash the module with your vehicle’s specific Vehicle Identification Number and the latest GM-certified software before it ships. This means no expensive trips to the dealership for programming. It’s a true plug-and-play fix that ensures all factory shift strategies and communication protocols are perfectly matched to your Savana 2500, restoring optimal performance and reliability right out of the box.
Built to meet or exceed original equipment standards, this module is engineered for longevity. It directly interchanges with a wide range of part numbers, including 24252114, 24230461, 24234274, and more, making it a versatile solution for countless GM trucks, vans, and SUVs from this era. With a one-year warranty and no core charge, you can make your repair with confidence and convenience.
Frequently Asked Questions
What does a T42 TCM do in my Savana van?
The T42 TCM is the central computer for your automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) to control shift solenoids, manage fluid pressure, and engage the torque converter clutch for smooth, efficient operation.
Is this module difficult to install?
Installation is straightforward for a DIY mechanic with basic tools. On the 2006-2014 Savana vans, the TCM is typically located in the right-hand (passenger side) of the engine compartment. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job usually takes less than 30 minutes.
Do I need to program this TCM after I receive it?
No. This is the key benefit of our product. We pre-program the module to your vehicle’s specific VIN before shipping. This makes it a plug-and-play installation, saving you the time and expense of a dealership visit for programming.
Will this fix a P0700 trouble 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, it’s always wise to scan for any other specific codes (like solenoid or sensor codes) to confirm the TCM is the primary point of failure.
Will this fit vehicles other than the GMC Savana 2500?
Yes, absolutely. The T42 TCM was used in a vast number of General Motors vehicles from 2006-2014, including the Chevrolet Silverado, Tahoe, Express, Impala; GMC Sierra, Yukon; Cadillac DTS; Pontiac G6, and many more. Please check the compatibility list on this page to confirm the fitment for your specific model.