Get Your Chevy Express Van Back to Work with a Reliable, Programmed TCM
If your 2006-2014 Chevrolet Express 2500 Van is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the problem is often a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless work vans sidelined by this exact issue. A faulty TCM doesn’t just make for a rough ride; it costs you time and money. This T42 TCM, part number 24243921, is the definitive solution to restore your van’s performance and reliability.
We take the guesswork and extra cost out of the repair by pre-programming this module to your van’s specific Vehicle Identification Number (VIN). This means it arrives ready for a true plug-and-play installation, with no need for an expensive trip to the dealership for programming. It’s designed to directly address the root cause of many common transmission problems, ensuring your 4L80E or other compatible GM transmission operates exactly as the factory intended. For a professional mechanic or a fleet owner, this means faster turnaround times. For the DIYer, it means a confident, straightforward repair you can do in your own driveway.
Case Study: The “Bad Transmission” That Wasn’t
A local contractor brought in his 2011 Express 2500, convinced the transmission was shot. It was slamming into gear and wouldn’t shift past 3rd. Another shop had quoted him over $3,000 for a transmission rebuild. I plugged in my scanner and saw a classic P0751 code (Shift Solenoid ‘A’ Performance/Stuck Off) and a general P0700. Before condemning the transmission, I checked the TCM. Sure enough, the internal driver for that solenoid circuit had failed—a common issue in these T42 modules due to heat cycles. We installed a VIN-programmed TCM, cleared the codes, and the van shifted perfectly. This simple part swap saved him thousands and got his work van back on the road the same day.
Is Your Express Van Showing These Symptoms?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” (usually only 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0756, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift correctly.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission module.
DIY Installation: No Special Tools Required
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- ✔ Locate the TCM: On the Express 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. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses, ensuring they click securely into place.
- ✔ Reconnect and Verify: Reconnect the negative battery terminal. Start the engine. The warning lights should be off. Use a basic OBD2 scan tool to confirm there are no remaining transmission codes.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. While this page focuses on the 2006-2014 Express 2500 TCM, it is also compatible with the following models. Please verify your specific application.
- Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express 1500/2500/3500 (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado 1500/2500 (07-13), SSR (05-06), Tahoe (07-09), Trailblazer (06-09)
- GMC: Canyon (08-12), Envoy / XL (06-09), Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon / XL 1500 (07-09)
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready to install, saving you time and the high cost of dealership programming.
What is the warranty on this part?
This Transmission Control Module comes with a one-year warranty, giving you peace of mind and confidence in your repair.
Is this the same as a T42 TCM?
Yes, this is a GM T42-style Transmission Control Module, which is the correct hardware for the listed vehicles and their 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E.
Do I need to return my old part?
No, there is no core charge for this module. You can keep or dispose of your old part without any hassle or extra fees.
Will this fix a P0700 code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While a faulty TCM is a very common cause, this code indicates a more specific transmission code is stored. This module often resolves the underlying issue causing the P0700, but you should scan for all codes for a complete diagnosis.