Restore Peak Transmission Performance to Your Workhorse Van
Is your 2006-2014 GMC Savana 2500 Van experiencing frustrating and costly transmission problems? Unpredictable shifting, getting stuck in gear, or a persistent check engine light can bring your work to a halt. This T42 Transmission Control Module (TCM), corresponding to part number YNXS, is the definitive solution. As the electronic brain of your automatic transmission (like the 4L60E, 4L65E, or 4L80E), this module governs every shift, ensuring smooth power delivery and optimal fuel economy. When it fails, the symptoms can range from annoying to debilitating. We solve this by providing a high-quality replacement that is pre-programmed to your van’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership programming and getting you back on the road fast.
A Technician’s Notebook: The Case of the Limping Work Van
A local contractor brought his 2011 Savana 2500 into my bay last month. The van was stuck in what we call ‘limp mode’—it wouldn’t shift out of 3rd gear. For a guy who relies on his vehicle for his livelihood, this was a disaster. He was losing jobs because he couldn’t get to them. A quick scan pulled a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. After 20 years of working on these GM vans, I knew exactly where to look. The original TCM, located on the right-hand side of the engine compartment, is constantly exposed to heat and vibration, which eventually cooks the internal circuits. We swapped in one of our VIN-programmed T42 modules, cleared the codes, and had him back on the road in under an hour. He called the next day, thrilled that his van was shifting better than it had in years. It’s a common failure, but thankfully, it’s a straightforward fix.
Is Your Savana Van Exhibiting These Transmission Issues?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these symptoms can lead to more severe and expensive transmission damage.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0753, P0758, or other solenoid-related faults.
- ✔ Inconsistent or no shifting, either up or down.
- ✔ A noticeable drop in fuel efficiency.
- ✔ The transmission feels like it’s slipping between gears.
Get Your Work Van Back on the Road: A Simple Installation Guide
One of the biggest benefits of our module is the simple, plug-and-play installation. Because we program it to your VIN, you can perform this repair right in your driveway or shop with basic tools. The entire process typically takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the 2006-2014 Savana 2500 Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical connectors. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the van and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page is focused on the 2006-2014 Savana 2500 TCM, it is also compatible with the following models. Please verify your part number (YNXS, 24242391, 24252114, etc.) to ensure perfect compatibility.
- GMC SAVANA 2500 VAN (2006-2014) – Transmission; (RH engine compartment)
- GMC SAVANA 1500 VAN (2006-2014) – Transmission; (RH engine compartment)
- GMC SAVANA 3500 VAN (2006-14) – Transmission; (RH engine compartment)
- Chevrolet EXPRESS 1500/2500/3500 VAN (2006-2014) – Transmission; (RH engine compartment)
- Chevrolet SILVERADO 1500/2500 PICKUP (2007-2013) – Transmission; (next to battery)
- GMC SIERRA 1500/2500 PICKUP (2007-2013) – Transmission; (next to battery)
- Chevrolet TAHOE / SUBURBAN 1500 (2007-2009) – Transmission; (next to battery)
- GMC YUKON / YUKON XL 1500 (2007-2009) – Transmission; (next to battery)
- And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. This means it arrives ready for immediate installation without any additional programming or dealer visits, saving you time and money.
What is a ‘core charge’ and do you require one?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this module. You can keep your old part, making the process simpler and hassle-free for you.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault code, indicating that the TCM has detected a problem. In many cases where the TCM itself is the source of the failure, replacing it with our programmed unit will resolve the P0700 code and any related solenoid codes.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure correct programming.
Is this part difficult to install for a DIYer?
Not at all. With basic hand tools and our step-by-step guide, most people can complete the installation in under 30 minutes. It’s one of the more straightforward electronic component replacements you can do.