If your 2006-2014 Chevrolet Express 3500 work van is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the problem is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I know that for a vehicle that earns you money, downtime is not an option. This T42 TCM, service part number 24255280, is the definitive solution to restore the crisp, reliable shifting your automatic transmission was designed for.
This isn’t just a part; it’s a plug-and-play fix. We pre-program the module to your van’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures it communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems, eliminating the need for expensive dealership programming. Get your workhorse back on the road fast with a part you can trust.
Case Study: A Tricky Diagnosis
A local plumbing company brought in their 2011 Express 3500. The complaint was intermittent—some days it shifted perfectly, others it would slam into gear or refuse to shift past 2nd. They had already replaced two shift solenoids at another shop, but the problem persisted. After hooking up my scan tool, I saw a generic P0700 code but also intermittent communication loss with the TCM. Instead of throwing more parts at it, we installed one of our VIN-programmed T42 modules. The communication faults vanished, and the van has been shifting smoothly for over 50,000 miles since. This is why a quality, correctly programmed 2006-2014 Express 3500 TCM is the key to fixing it right the first time.
Is Your Express Van Showing These Red Flags?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ The Check Engine Light or a transmission warning light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Inconsistent or no shifting, leading to poor acceleration and bad fuel economy.
- ✔ Complete loss of communication with the transmission module.
Your 30-Minute Path to a Smooth-Shifting Van
Installing your new 2006-2014 Express 3500 TCM is a straightforward job for any DIYer or professional. No special tools are needed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting work.
- Locate the Module: On the Express 3500 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 old module from its mounting bracket.
- Install the New TCM: Mount the new module in place and securely fasten it. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your GM Vehicle
While this is the correct part for the 2006-2014 Express 3500 TCM replacement, this versatile T42 module also fits a wide range of other GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. It is a direct replacement for part numbers 24252114, 24234503, 24256960, and others listed in the interchange data. Please verify your vehicle in the list below or contact us with your VIN.
Frequently Asked Questions
Do I need to take my van to the dealer after installation?
No. This module comes fully programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you time and the high cost of dealership programming.
What is a T42 TCM?
The T42 is the General Motors hardware designation for the transmission control module used across a wide variety of their vehicles in the 2000s and 2010s. It is the electronic brain that controls all shifting functions.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the ECM to turn on the check engine light. While a failing TCM is a very common cause, you should scan for more specific P-codes (like P0751, P0756, etc.) to confirm. This module often resolves these underlying codes.
What information do you need to program the module?
We only need your vehicle’s 17-digit VIN (Vehicle Identification Number) to load the correct GM-certified software for your specific application.