If your 2006-2014 Chevrolet Express 2500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re dealing with a vehicle that can’t be trusted on the job. As the brain of your automatic transmission, a failing Transmission Control Module (TCM) can bring your workhorse to a grinding halt. This OEM-quality T42 TCM, part number 24238856, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair.
Forget about costly dealership visits and lengthy programming appointments. We handle the complex part for you. Simply provide your VIN during checkout, and our technicians will flash the module with the latest GM software updates. This ensures perfect communication between your engine and transmission, restoring the smooth, predictable shifting you depend on. This module is the key to resolving common issues related to the 4L60E, 4L65E, 4L70E, and 4L80E transmissions found across the GM lineup.
From the Diagnostic Bay: The Case of the Limping Work Van
I remember a fleet manager coming into my shop, completely frustrated. One of his Express 2500 work vans was randomly dropping into ‘limp mode’—stuck in 3rd gear—in the middle of service calls. His driver was losing time, and the business was losing money. We scanned it and found a P0700 (Transmission Control System Malfunction) and intermittent solenoid circuit codes. After checking the wiring harness for damage (a common issue on work vehicles), we pinpointed the culprit: the original TCM. Heat cycles and constant vibration had taken their toll. We installed one of our VIN-programmed T42 modules. The entire job took less than an hour, and the van was back in service the same day, shifting perfectly. That’s the power of a reliable, pre-programmed part.
Is Your Van Showing These Telltale Symptoms?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy or the transmission seems to be overheating.
- ✔ Complete loss of communication with the TCM, preventing diagnostics.
Your Straightforward 30-Minute Installation Guide
Installing your new Express 2500 Van TCM is a simple process that most DIYers can handle with basic tools. No need for specialized equipment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On most Express and Savana vans, the TCM is located in the engine compartment on the right-hand (passenger) side. It’s an externally mounted silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in the same location and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s good practice to use a basic scan tool to clear any stored fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Fitment For Your General Motors Vehicle
This T42 TCM is a direct replacement for a wide range of GM vehicles, ensuring broad compatibility. It is interchangeable with part numbers 24252114, 24234503, 24238856, and more. While this page is focused on the Express Van, this part also fits:
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche, Impala, Cobalt, HHR, Colorado
- GMC: Sierra, Yukon, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Rainier, Allure
- Cadillac: DTS
- Pontiac: G6, Grand Prix
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you hundreds in dealership fees and programming time.
Where is the TCM located on my 2009 Express 2500 Van?
On the 2006-2014 Express and Savana vans, the Transmission Control Module is typically found mounted in the engine bay on the passenger’s side (RH side).
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old part without any hassle or need to ship it back to us.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by wiring or solenoid issues. Replacing a known-bad TCM is often the correct fix for a P0700 and its related specific codes (like P0753, etc.).
What information do you need to program the module?
We only need your vehicle’s 17-digit Vehicle Identification Number (VIN). You can provide this during the checkout process. This allows us to load the correct factory software for your specific vehicle configuration.