Restore Peak Performance to Your Workhorse Van
If your 2006-2014 GMC Savana 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is very likely a failing Transmission Control Module (TCM). As the electronic brain of your 4L60E or 4L65E transmission, a faulty TCM can bring your work van to a grinding halt. This OEM-quality T42 TCM, part number YNXS, is the definitive solution. It arrives expertly pre-programmed to your van’s specific VIN, eliminating the need for expensive dealership programming and ensuring a direct, plug-and-play fix right out of the box.
Case Study: The Intermittent Fleet Van Failure
I once had a local delivery company bring in their 2011 Savana 1500. The driver reported that some days it shifted perfectly, but on others, it would slam into gear or refuse to upshift past 2nd. They had already replaced a shift solenoid with no luck. After connecting my scan tool, I saw no hard codes, just a history of intermittent communication loss with the TCM (a classic U-code). These T42 modules are known for developing internal connection failures from heat cycles and vibration over thousands of miles. We installed a VIN-programmed module, and the van was back in reliable service the same afternoon. It’s a textbook example of how a failing Savana 1500 Transmission Module can mimic mechanical issues.
Is Your Savana Van Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are electronic. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ The Check Engine Light or a transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ A complete loss of communication with the transmission module.
- ✔ Poor fuel economy or a sensation of the transmission slipping.
Get Your Van Back to Work: A 30-Minute Installation Guide
For the GMC Savana and Chevrolet Express vans, this is one of the more straightforward module replacements. No lift is required, and you can have it done in under 30 minutes with basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work. This prevents electrical shorts and helps reset the vehicle’s systems.
- Locate the Module: On your 2006-2014 Savana 1500, the TCM is located in the engine compartment on the right-hand (passenger) side, typically mounted to the firewall or inner fender.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. There are usually two or three small bolts holding it in place.
- Install the New Module: Mount your new, VIN-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. While our programming resolves most issues upon startup, it’s good practice to use a basic scan tool to clear any stored DTCs from the vehicle’s memory. Start the van and test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24234274, 24235340, YNXS, and more. While this page focuses on the Savana 1500 Transmission Module, it also fits:
- Chevrolet: Silverado, Tahoe, Suburban, Express, Impala, Cobalt, HHR, Colorado
- GMC: Sierra, Yukon, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Rainier
- Cadillac: DTS
- Pontiac: G6, Grand Prix
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
Frequently Asked Questions
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your van’s other computers (like the ECM and BCM) for optimal shift points and performance, just like a new part from the dealer, but without the extra trip and programming fee.
No. Basic hand tools like a socket set are all that’s required to unbolt the old module and install the new one. The most important part is disconnecting the battery first.
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us.
A P0700 code is a general fault request from the TCM to the ECM to turn on the check engine light. In many cases where the TCM itself has failed, replacing it with this programmed module will resolve the root cause and allow the P0700 code (and other related codes) to be cleared permanently.
This module comes with a one-year warranty, giving you peace of mind that you’re installing a quality, reliable part in your vehicle.