Get Your Workhorse Back on the Road: The Definitive Fix for Your Van’s Transmission
If your 2006-2014 GMC Savana 2500 is your livelihood, you can’t afford downtime caused by a faulty transmission control module (TCM). When you’re dealing with erratic shifting, a check engine light that won’t quit, or your van being stuck in limp mode, you need a reliable, fast solution. This T42 Transmission Control Module, part number 24240400, is the answer. As a technician with over two decades of experience, I’ve seen firsthand how a failing TCM can sideline a perfectly good work van. This isn’t just a part; it’s a direct solution to restore the crisp, predictable shifting your 4L80E transmission was designed for.
The biggest hurdle in this repair has always been the programming. Historically, you’d have to install the part and then tow the vehicle to a dealership for expensive programming. We eliminate that step entirely. We pre-program this module to your van’s specific Vehicle Identification Number (VIN) before it even ships. This ensures it communicates flawlessly with your vehicle’s systems right out of the box. It’s a true plug-and-play fix that gets you back to work faster.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’09 Savana 2500 with a complaint of intermittent, bone-jarring shifts and a persistent P0700 code. His previous mechanic had replaced two solenoids, but the problem remained. In my shop, we know that these T42 modules can develop internal fractures from years of heat cycles, causing unpredictable communication errors that mimic solenoid failure. Instead of chasing ghosts, we installed one of our VIN-programmed modules. The entire job took less than 30 minutes, the code cleared, and the van was back on the job site the same afternoon. This is the kind of efficient, definitive repair we provide.
Is Your Savana Van Exhibiting These Issues?
- ✔ Harsh, slamming shifts or unpredictable gear changes.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”) and won’t shift up or down.
- ✔ A lit Check Engine Light or Transmission Warning Light on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700 (Transmission Control System Malfunction), P0750-series (Shift Solenoid), or other transmission-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor fuel economy and a feeling of sluggish performance.
A Straightforward Guide to Installation
- ✔ Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the vehicle’s computer systems.
- ✔ Locate the Module: On the 2006-2014 Savana Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side. It’s a silver box with electrical connectors.
- ✔ Disconnect and Remove: Carefully unplug the electrical harness connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, VIN-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any lingering fault codes from the system. Start the vehicle and test drive to confirm smooth operation.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page is focused on the 2006-2014 Savana 2500 Transmission Module, it also fits other models. This part is interchangeable with service numbers including 24252114, 24234503, 24240400, 24239224, and more. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Key Applications Include:
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500) | 2006-2014
- Chevrolet Silverado & GMC Sierra Pickups | 2007-2013
- Chevrolet Tahoe & GMC Yukon | 2007-2009
- Chevrolet Trailblazer & GMC Envoy | 2006-2009
- Hummer H3 | 2008-2010
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to take my van to the dealer for programming after installation?
No. The main benefit of our service is that we pre-program the module to your van’s VIN before shipping. This makes it a true plug-and-play installation, saving you time and money.
Where is the TCM located on my Savana 2500?
On most 2006-2014 Savana and Express vans, the Transmission Control Module is located in the engine bay, on the passenger side (RH side).
Will this 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 root cause (like a faulty solenoid circuit inside the TCM itself), you should ensure the transmission wiring and solenoids are in good condition. In many cases I’ve diagnosed, a faulty TCM was the primary cause.
What tools are required for this job?
The installation is very straightforward. You will typically only need basic hand tools, such as a socket set to remove the module’s mounting bolts and potentially a small screwdriver to help release the electrical connector tabs. No specialized equipment is needed.
Is there a core charge for my old 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.