Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 GMC Savana 2500, Chevrolet Express, or other GM vehicle suffering from erratic shifting, getting stuck in gear, or displaying transmission-related trouble codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and ensuring overall driveline efficiency. When it fails, it can lead to frustrating performance issues, poor fuel economy, and even leave you stranded. This OEM-quality T42 TCM, service part number 24240400, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We recently had a 2011 Savana 2500 work van come into the shop. The owner complained of intermittent, bone-jarring shifts from 1st to 2nd gear and occasional warning lights that would disappear after restarting the engine. Scans revealed a P0751 code for a stuck-off shift solenoid, but testing the solenoid and wiring showed no faults. The issue was intermittent and hard to pin down. Knowing the history of T42 modules, we suspected the TCM itself was failing internally, causing the erratic commands. We installed one of our VIN-programmed T42 modules. The installation took less than 20 minutes. After a quick battery disconnect to clear adaptive memory and a test drive, the van shifted like it just rolled off the assembly line. The owner was thrilled to have his reliable workhorse back on the road without a costly trip to the dealership.
Symptoms of a Failing Savana 2500 Transmission Module
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, check for these common electronic symptoms. Replacing a bad module can save you thousands in unnecessary mechanical repairs.
- ✔ Harsh or Erratic Shifting: Experiencing sudden, jerky gear changes or unpredictable shifting patterns.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ Stuck in Limp Mode: The vehicle may be stuck in a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: Illumination of the Check Engine Light or a dedicated transmission warning light on your dash.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (P0750, P0751, etc.).
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a significant drop in MPG.
- ✔ No Communication: A scan tool may be unable to communicate with the TCM, indicating a complete module failure.
The Plug-and-Play Advantage: Pre-Programmed for Your VIN
The biggest hurdle when replacing a modern vehicle module is programming. Dealerships often charge hundreds for this service alone. Our T42 TCMs eliminate this step entirely. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it has the latest GM software and is perfectly calibrated for your vehicle’s specific configuration, including engine, axle ratio, and tire size. The result is a true plug-and-play installation—no expensive tools or dealership visits required. Simply install the part, connect your battery, and drive away.
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming loads your vehicle’s specific factory software and calibrations onto the TCM. This is critical for ensuring the transmission shifts correctly, communicates with the engine computer (ECM), and operates as the manufacturer intended. Without it, the vehicle may not start, shift properly, or may display error codes.
Where is the TCM located on my 2008 GMC Savana 2500?
On the 2006-2014 GMC Savana and Chevrolet Express vans, the T42 transmission control module is typically located in the engine compartment on the right-hand (passenger) side. Always confirm the location for your specific model, as it can vary slightly on other compatible vehicles.
Do I need to perform a relearn procedure after installation?
While our module is programmed for immediate use, it’s always a good practice to disconnect the battery during installation. This helps reset the vehicle’s adaptive learning memory. The transmission will then perform a new adaptive learning cycle as you drive, fine-tuning shift points for optimal performance over the first 50-100 miles.
Is this module compatible with other part numbers?
Yes, this T42 TCM is a direct replacement for a wide range of service numbers, including 24252114, 24234503, 24242391, and many others listed in the product details. It’s designed to function perfectly in any vehicle originally equipped with a compatible T42 module.
Is there a core charge for my old part?
No, we do not require you to send back your old module. There is no core charge associated with this purchase, saving you time and the hassle of return shipping.