Get Your Workhorse Back on the Road with a Reliable, Programmed TCM
If your 2006-2014 GMC Savana 2500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good work van, costing you time and money. This isn’t just a part; it’s the brain of your automatic transmission, and when it fails, your vehicle’s reliability and drivability suffer dramatically. This OEM-quality T42 TCM, part number 24239926, is the definitive solution to restore crisp, predictable shifting and get your van performing like new.
A Technician’s Notebook: The Case of the Intermittent Limp Mode
A local contractor brought in his Savana 2500, complaining that it would randomly get stuck in 3rd gear, but only after it had been running for over an hour on hot days. There were no hard codes stored, just a generic P0700 (Transmission Control System Malfunction) that would appear and disappear. We checked the fluid, wiring, and solenoids—all were fine. From experience, I knew these symptoms pointed to heat-related failure inside the TCM. The delicate electronics were breaking down under thermal stress. We installed one of our pre-programmed modules, and the problem was solved instantly. The customer was back on the job the same afternoon, avoiding a costly, multi-day diagnostic ordeal at a dealership.
Is Your Savana Van Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete breakdown. Often, the symptoms start small and get progressively worse. If you’re experiencing any of the following, it’s time to inspect your Savana 2500 Transmission Module.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of a single gear (usually 2nd or 3rd).
- ✔ The Check Engine Light or a transmission-specific warning light is on.
- ✔ Your scan tool shows Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy or the sensation of the transmission slipping.
- ✔ Complete loss of communication with the transmission module.
Get Your Van Back to Work: A 30-Minute Install Guide
One of the best features of this module is that it arrives programmed to your van’s VIN. This makes the installation a straightforward job you can do with basic hand tools, saving you hundreds in dealership labor and programming fees.
- 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 internal systems.
- Locate the Module: On the 2006-2014 GMC Savana and Chevy Express vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side, mounted to the inner fender or near the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory. Start the engine and take a test drive to confirm smooth shifting.
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 focuses on the Savana 2500 Transmission Module, it is also compatible with the following models. Please verify your part number (24239926) or consult the list below.
- GMC Savana / Chevrolet Express (1500, 2500, 3500): 2006-2014 (RH engine compartment)
- GMC Sierra / Chevrolet Silverado (1500, 2500): 2007-2013 (Location: next to battery)
- GMC Yukon / Chevrolet Tahoe / Suburban: 2007-2009 (Location: next to battery)
- Chevrolet Colorado / GMC Canyon: 2008-2012 (RH rear engine compartment)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Chevrolet Impala / Monte Carlo: 2006-2011 (Under lower air cleaner housing)
- …and many other Buick, Cadillac, Pontiac, and Saturn models.
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific 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 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 to send my old TCM back (core charge)?
No, there is absolutely no core charge. You can keep your old part, recycle it, or dispose of it at your convenience. This makes the transaction simple and hassle-free.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, replacing a faulty TCM will resolve the P0700 and any other specific transmission codes (like for solenoids) that were being triggered by the failing module. However, you should always ensure the underlying issue is the module itself and not a wiring or mechanical problem.
Is this part covered by a warranty?
Yes, this transmission control module comes with a one-year warranty, giving you peace of mind that you are installing a quality, reliable part in your vehicle.