Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 GMC Savana 2500 experiencing erratic shifting, getting stuck in gear, or displaying a check engine light with transmission 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 gear changes, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed. This genuine GM T42 TCM, service number 24252114, is the definitive solution to restore your vehicle’s drivability and reliability.
From the Diagnostic Bay
We had a 2011 Savana 2500 work van come into the shop that was stuck in third gear—a classic “limp mode” scenario. The driver reported that shifts had been getting progressively harsher over the last month. A quick scan pulled code P0700, a general transmission fault, along with several solenoid performance codes. Instead of chasing individual solenoids inside the transmission, our experience pointed directly to the T42 TCM. After confirming power and ground to the module, we installed one of our VIN-programmed units. The entire process took less than 30 minutes. After clearing the codes, a test drive confirmed perfectly smooth upshifts and downshifts. The van was back in service the same day, saving the owner significant downtime and the high cost of a dealership repair.
Diagnosing a Faulty Savana 2500 TCM
A failing transmission module can manifest in various ways, often mimicking internal transmission problems. Recognizing these symptoms early can save you from more extensive repairs. This replacement module is engineered to resolve these exact issues, providing a dependable and lasting fix for your vehicle. If your truck or van is showing any of the following signs, a faulty TCM is the likely culprit.
Common Symptoms of a Bad T42 TCM
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle is stuck in a single gear (limp mode) and will not shift up or down.
- ✔ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission feels like it’s slipping between gears.
- ✔ Complete loss of communication with the transmission module, preventing diagnostics.
The Plug-and-Play Advantage: VIN Programming Included
The biggest challenge when replacing modern electronic modules is the need for expensive and time-consuming dealership programming. We eliminate this step entirely. Each T42 TCM is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the module has the latest GM software and is perfectly calibrated for your vehicle’s engine, transmission, and tire size. The result is a true plug-and-play installation that restores factory performance right out of the box. Simply install the module, connect the battery, clear any old codes, and drive away.
Key Features & Benefits
- ✔ VIN Programmed for Your Vehicle: Arrives ready for installation with no need for additional programming or calibration.
- ✔ Restores Smooth Shifting: Corrects issues like harsh engagement, slipping, and delayed shifts by restoring precise electronic control.
- ✔ Clears Fault Codes: Directly addresses the root cause of common transmission-related DTCs.
- ✔ OEM-Quality Construction: Built to meet or exceed General Motors’ specifications for durability and performance.
- ✔ Broad Compatibility: A direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core.
This module is a direct replacement for multiple service numbers, including 24242391, 24234503, 24256960, and more, making it the ideal part for countless Chevrolet, GMC, Buick, Cadillac, Pontiac, and Saturn models from 2006 to 2014. Whether you’re working on a Sierra, Tahoe, Impala, or Express van, this module provides a reliable and straightforward repair.
Frequently Asked Questions
What does this T42 Transmission Control Module do?
The T42 TCM acts as the central computer for your automatic transmission. It receives data from various vehicle sensors (like speed, throttle position, and engine RPM) to control shift solenoids, regulate hydraulic pressure, and manage the torque converter clutch, ensuring optimal shifting and performance.
Is this part truly plug-and-play?
Yes. By providing your vehicle’s VIN during checkout, we program the module with the correct software and calibration files from GM. This means it will be ready to install and function correctly immediately, without requiring a trip to the dealer for programming.
Where is the TCM located on my 2008 GMC Savana 2500?
On most GMC Savana and Chevrolet Express vans from this era, the TCM is located in the engine compartment on the right-hand (passenger) side. Always disconnect the vehicle’s battery before attempting to remove or install the module.
What happens if I don’t replace a failing TCM?
Continuing to drive with a faulty TCM can lead to more severe issues. Poor shifting can cause excessive wear on internal transmission components like clutches and bands, eventually leading to a complete transmission failure that is far more costly to repair.
Do I need to return my old TCM?
No, there is no core charge associated with this part. You can keep your old module, which saves you the time, hassle, and expense of a core return process.