Fix Your Savana’s Shifting Problems for Good
If you depend on your 2006-2014 GMC Savana 3500 Van for your livelihood, you know that transmission trouble means downtime and lost income. Issues like harsh shifting, getting stuck in gear, or an illuminated check engine light can sideline your workhorse indefinitely. This T42 Transmission Control Module (TCM), part number 24241806, is the reliable, cost-effective solution to get you back on the road fast. As the brain of your automatic transmission, it controls every shift point and torque converter operation, and a failing one is often the root cause of perplexing transmission issues.
We take the guesswork and high dealership costs out of the repair. Each module is pre-programmed to your van’s specific Vehicle Identification Number (VIN), ensuring it works perfectly right out of the box. This eliminates the need for expensive programming or relearn procedures at a service center, making it a perfect fix for both professional mechanics and savvy fleet owners.
Case Study: The “Haunted” Work Van
I once had a 2011 Savana 3500 in my bay that the owner swore was haunted. It would shift perfectly for days, then suddenly start slamming into gear or refuse to shift out of 2nd. Two other shops had replaced solenoids and fluid, but the problem always came back. After hooking up my scan tool and monitoring live data, I noticed the command signals from the TCM were erratic. The solenoids were fine; the commands were the problem. A failing circuit board inside the original TCM was overheating intermittently. We installed one of these VIN-programmed T42 modules, and the van has been running reliably for that contractor ever since. It’s a classic case where the root cause isn’t mechanical, but electronic.
Is Your Savana Van Showing These Warning Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, a faulty transmission module is the likely culprit. Over my 20 years as a technician, I’ve seen these symptoms hundreds of times, especially on hardworking vehicles like the Savana.
- ✔ Unpredictable or harsh gear changes.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related codes.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor fuel economy and a feeling of sluggish performance.
- ✔ Complete loss of communication with the transmission.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. You don’t need a vehicle lift or specialized transmission tools. For the Savana 3500, the process is particularly accessible.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: On the 2006-2014 Savana Van, the TCM is conveniently located in the engine compartment on the right-hand (passenger) side.
- Swap the Part: Carefully unplug the electrical connectors from the old module. Unbolt it from its mounting bracket. Secure the new module in place and firmly reconnect the electrical harnesses.
- Power Up: Reconnect the negative battery terminal.
- Final Check: Start the engine. While our VIN programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any old, stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This module, part number 24241806, is a direct replacement for a wide range of General Motors vehicles. While it’s a perfect fit for the 2006-2014 Savana 3500 Transmission Module, it also fits many other cars, trucks, and SUVs. Please verify your vehicle from the list below.
- SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
- SIERRA 1500/2500 PICKUP 07-13 (Location varies, check notes)
- SILVERADO 1500/2500 PICKUP 07-13 (Location varies, check notes)
- TAHOE & YUKON 07-09 (Next to battery)
- ENVOY & TRAILBLAZER 06-09 (LH engine compartment)
- IMPALA & GRAND PRIX 06-11 (Lower air cleaner housing)
- COBALT & G5 & G6 06-10 (LH strut tower)
- And many more models from Buick, Cadillac, Hummer, Pontiac, Saab, and Saturn.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is a computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses that information to control when the transmission shifts gears, when the torque converter locks up, and overall transmission performance for both smoothness and fuel efficiency.
Is this part difficult to install myself?
No, this is a very DIY-friendly repair. For a Savana van, the module is easily accessible in the engine bay. Basic hand tools are all that’s required, and the entire process typically takes less than 30 minutes.
Will I need to go to a dealership for programming after installation?
Absolutely not. That’s the primary benefit of our service. We pre-program the module to your vehicle’s VIN before shipping it. This makes it a true plug-and-play solution, saving you the time, hassle, and expense of a dealership visit.
What happens if I continue driving with a bad TCM?
Continuing to drive with a faulty TCM can lead to more severe problems. Poor shifting can cause excessive wear on internal transmission components like clutches and bands, potentially leading to a complete transmission failure that costs thousands to repair. It’s also a safety risk if the vehicle unexpectedly enters limp mode or shifts erratically in traffic.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the process for you.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind that you’re installing a quality, reliable part in your vehicle.