If your 2006-2014 GMC Savana 3500 work van is experiencing unpredictable shifting, getting stuck in gear, or has a check engine light glaring at you, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your automatic transmission, the T42 TCM is responsible for every gear change and torque converter operation. When it fails, your van’s reliability and performance suffer. This replacement T42 TCM, part number 24240400, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A fleet manager brought in a 2011 Savana 3500 that was randomly dropping into limp mode (stuck in 3rd gear), making his delivery routes a nightmare. His local shop replaced two shift solenoids, but the problem persisted, along with a stubborn P0700 code. From my experience with hundreds of these GM transmissions, I knew the symptoms pointed to an internal TCM fault, not the solenoids. We installed one of our VIN-programmed T42 modules. The total time from diagnosis to test drive was under an hour. The van was back in service the same day, shifting perfectly, and the fleet manager avoided the cost and delay of a dealership visit.
Is Your Savana Van Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re noticing any of the following issues with your 2006-2014 Savana 3500 TCM, it’s time for a replacement.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Solenoid Faults), or other transmission-related codes.
- ✔ Inconsistent upshifting or downshifting, leading to poor acceleration.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
Straightforward 30-Minute Installation Guide
You don’t need to be a master mechanic to install this module. The process is simple and can be done with basic hand tools in your own garage or workshop.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: On the Savana 3500 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. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount the new, pre-programmed TCM onto the bracket and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our VIN programming handles the critical setup, it’s good practice to use a standard OBD2 scan tool to clear any old fault codes from the computer’s memory. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24240400 and is interchangeable with numerous other service numbers. It is guaranteed to fit the following models, among others:
- GMC Savana 1500/2500/3500 Van (2006-2014)
- Chevrolet Express 1500/2500/3500 Van (2006-2014)
- Chevrolet Silverado & GMC Sierra (2007-2013)
- Chevrolet Tahoe, Suburban & GMC Yukon (2007-2009)
- Cadillac DTS, Buick Lucerne, Chevrolet Impala (2006-2011)
- Hummer H3, Chevrolet Colorado, GMC Canyon (2008-2012)
- And many more GM vehicles equipped with 4L60E, 4L65E, 4L70E, and 4L80E transmissions.
Frequently Asked Questions
What does “VIN Programmed” mean for my Savana van?
It means we load your van’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 vehicle’s engine computer and other systems right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools like a socket set and ratchet are all you’ll need to access and replace the module. The entire job typically takes less than 30 minutes.
Will this fix a P0700 check engine light code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the fault, replacing it with our pre-programmed unit will resolve the issue and allow the code to be cleared.
Is there a core charge for my old TCM?
No, there is no core charge. You are not required to send your old, faulty module back to us. You can keep it or dispose of it at your convenience.
What kind of warranty comes with this part?
This Transmission Control Module is backed by our one-year warranty, giving you peace of mind and confidence in your repair.