Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 GMC Savana 2500, Chevrolet Express, or other GM vehicle experiencing frustrating transmission problems? Symptoms like harsh, erratic shifting, getting stuck in gear, or an illuminated Check Engine Light often point directly to a failing Transmission Control Module (TCM). This genuine GM T42 TCM, service number 24256960, is the definitive solution to restore the smooth, reliable performance your vehicle was built for. As the electronic brain of your automatic transmission, the TCM is responsible for managing shift points, torque converter clutch engagement, and line pressure. When it fails, drivability suffers. Our module comes pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a seamless, plug-and-play installation.
From the Diagnostic Bay
We recently had a 2011 Savana 2500 work van come into the shop with classic symptoms of TCM failure. The owner reported it was slamming into gear and would intermittently get stuck in what felt like third gear (limp mode), making it nearly impossible to drive. A scan revealed a generic P0700 transmission fault code along with several specific solenoid circuit errors. While these codes can sometimes suggest internal transmission issues, experience pointed us to the T42 module. After installing this exact VIN-programmed TCM, all fault codes were cleared, and a short test drive confirmed the transmission was shifting as smoothly as the day it left the factory. The customer saved thousands compared to an unnecessary transmission replacement.
Common Symptoms of a Failing T42 TCM
- ✔ Erratic and Harsh Shifting: Experiencing abrupt, jerky, or unpredictable gear changes during acceleration or deceleration.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific faults (e.g., P0750, P0753, P0758).
- ✔ Delayed Engagement: A noticeable lag when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can lead to a significant drop in MPG.
- ✔ No Communication: In some cases, a scan tool may be unable to communicate with the TCM, indicating a complete failure.
Why Our Savana 2500 Transmission Module is the Right Choice
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The critical benefit is our expert VIN programming service. We flash the module with the latest GM software updates specific to your vehicle’s VIN before it ships. This ensures that all shift strategies and operational parameters are perfectly matched to your Savana 2500, providing optimal performance and longevity right out of the box. Built to strict OEM standards, this T42 TCM directly addresses the root cause of many electronic transmission failures, providing a dependable and lasting repair.
Broad Compatibility Across the GM Lineup
While this is a perfect fit for the Savana 2500, the versatile T42 module was used in a wide array of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. This part is interchangeable with numerous service numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24235732, 24235753, 24240449, and YNXS.
Simple, Straightforward Installation
Designed for the professional technician and the capable DIYer, installation is typically completed in under 30 minutes. On most Savana and Express vans, the TCM is located in the engine compartment on the right-hand side. On other models, it can be found near the battery, on the LH strut tower, or under the air cleaner box. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the battery, and you’re ready to go. We recommend using a scan tool to clear any stored DTCs after installation for a clean slate.
Frequently Asked Questions
Is this part ready to install out of the box?
Yes. We pre-program the module using the VIN you provide during checkout. This ensures it is fully compatible with your vehicle’s specific configuration and requires no additional programming from a dealership.
Where is the TCM located on my 2006-2014 Savana 2500?
On the GMC Savana and Chevrolet Express vans from this era, the Transmission Control Module is typically located in the engine compartment on the right-hand (passenger) side.
Will this module 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 underlying issue causing the P0700 (like internal circuit failure or solenoid faults), you should always diagnose any specific codes that accompany it. In many cases, a faulty TCM is the root cause.
Do I need to return my old part?
No. We do not require you to return your old module. There is no core charge associated with this purchase, saving you time and hassle.
What transmissions is this T42 module compatible with?
This TCM is designed for vehicles equipped with GM’s popular 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E.