Restore Peak Performance to Your 2006-2014 Chevrolet Express 2500 Van
If your workhorse Express Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is likely a failing Transmission Control Module (TCM). As the brain of your automatic transmission, a faulty TCM can bring your operations to a halt. This T42 series TCM, equivalent to part number 24256960, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair that gets you back on the road without a costly trip to the dealership.
Case Study: The Fleet Van Failure
A local plumbing company brought in one of their 2011 Express 2500 vans with a complaint that stumped other shops: intermittent ‘limp mode’ that only happened after an hour of driving on hot days. There were no consistent codes, just a generic P0700 (Transmission Control System Malfunction) now and then. After checking the wiring and fluid, we suspected the TCM was failing under heat. We installed one of our VIN-programmed T42 modules. The fix was immediate. The van’s shifting became crisp and predictable, and the intermittent limp mode vanished. They were so impressed with the fast turnaround that we ended up replacing the TCMs in their other four vans as a preventative measure, saving them from future costly downtime.
Is Your Express Van Showing These Warning Signs?
A failing TCM doesn’t just get worse; it can cause damage to your transmission’s internal components over time. If you’re experiencing any of these symptoms, it’s time for a replacement.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in one gear (often 2nd or 3rd) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0751, or other solenoid-related faults.
- ✔ Complete loss of shifting capability or intermittent failure to engage Drive or Reverse.
- ✔ Poor fuel economy and a feeling of sluggish performance.
- ✔ The torque converter fails to lock up at highway speeds, causing high RPMs.
Get Your Van Back in Service: A 30-Minute Install Guide
Replacing the 2006-2014 Express 2500 TCM is a straightforward job you can do with basic hand tools. For the Express and Savana vans, the module is conveniently located in the engine compartment on the right-hand (passenger) side, making access simple.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On your Express 2500, find the TCM mounted in the RH engine compartment. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Securely plug in the wiring harness connectors, ensuring they click and lock into position.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scan tool, it’s good practice to clear any stored fault codes from the system’s memory.
Verified Fitment for Your GM Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide array of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2006-2014 Express 2500 TCM, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Chevrolet: Avalanche (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 (06-09), Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon / Yukon XL (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)
This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Frequently Asked Questions
Does this module require any additional programming?
No. This is the biggest benefit of our service. We program the module to your vehicle’s VIN before shipping it. It arrives ready for installation, with no need for a scan tool or a visit to a mechanic or dealership for programming.
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. You can keep it or dispose of it at your convenience.
What tools do I need for the installation?
For most vehicles, including the Express van, you will only need a basic socket set to remove the mounting bolts and possibly a flathead screwdriver to help release the wiring connector tabs. No specialized tools are required.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, replacing a faulty TCM will resolve the issue causing the P0700 code, especially if it’s accompanied by other transmission-specific codes. This module is designed to correct the internal failures that trigger these codes.
What if I still have problems after installing the new TCM?
While this module resolves the vast majority of electronic transmission issues, persistent problems could indicate a mechanical issue within the transmission (like a bad solenoid or clutch pack) or a wiring harness problem. Our modules are fully tested and backed by a one-year warranty for your peace of mind.