If your 2006-2014 Chevrolet Express 3500 Van is your lifeline, you can’t afford downtime caused by a faulty transmission. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring a reliable workhorse to a dead stop. Hard slams into gear, getting stuck in limp mode on the way to a job, or a persistent Check Engine Light are more than just annoyances—they’re threats to your livelihood. This T42 TCM, part number 24239926, is the definitive, no-hassle solution to restore your van’s performance and dependability.
This isn’t just a replacement part; it’s a complete fix. We pre-program the module to your van’s specific VIN before it ships. This means you can skip the expensive trip to the dealership for programming. It arrives ready for a true plug-and-play installation, getting you back on the road and back to work with minimal delay.
From the Diagnostic Bay: The Case of the Limping Work Van
A local contractor brought in his 2011 Express 3500, complaining it was stuck in what felt like third gear. The Check Engine Light was on, and his scanner showed a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. He was losing money every hour the van was down. We confirmed the solenoids were functional, which pointed directly to the TCM—a common failure point. Instead of a multi-day wait and a hefty bill from the dealer, we installed one of our VIN-programmed T42 modules. In under an hour, the codes were cleared, the van was shifting perfectly, and he was on his way to his next job. That’s the value of a ready-to-install solution.
Is Your Work Van Showing These Red Flags?
A bad TCM often gives clear warning signs. If you’re experiencing any of the following, it’s time to diagnose the module:
- ✔ Harsh, erratic, or delayed gear shifts that make driving unpredictable.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear) to protect the transmission.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0751, P0756, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
- ✔ The transmission refuses to upshift or downshift properly.
Why Our 2006-2014 Express 3500 TCM is the Smart Choice
This module is engineered to solve the core problems associated with TCM failure. By replacing the faulty brain of your transmission, you’re not just clearing codes—you’re restoring the precise electronic control needed for smooth operation, proper torque converter lockup, and optimal fuel efficiency. Built to meet or exceed OEM specifications, it’s a reliable component designed to withstand the demanding conditions of a commercial vehicle.
Get Your Van Back to Work: A 30-Minute Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- ✔ Locate the TCM: On the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the battery terminal. Start the vehicle and use a standard OBD2 scan tool to clear any stored fault codes. Take the van for a test drive to confirm smooth shifting.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24239926 and is interchangeable with other service numbers like 24252114, 24234503, and more. It is confirmed to fit the following vehicles, among others:
- Chevrolet Express 1500/2500/3500 Van (2006-2014)
- GMC Savana 1500/2500/3500 Van (2006-2014)
- Chevrolet Silverado & GMC Sierra (Certain models 2007-2013)
- Chevrolet Tahoe & GMC Yukon (Certain models 2007-2009)
- Chevrolet Impala, Cobalt, HHR
- Cadillac DTS, Buick LaCrosse, Pontiac G6, and many more.
Please verify your specific model and part number to ensure compatibility.
Frequently Asked Questions
What exactly does VIN programming do for me?
VIN programming loads your vehicle’s specific software and calibrations onto the module before shipping. This makes it a true plug-and-play part, allowing the TCM to communicate perfectly with your van’s engine and other systems without needing a trip to the dealer for expensive programming.
Is this part difficult to install myself?
Not at all. For most DIYers with basic hand tools, this is a straightforward job that can be completed in under 30 minutes. The module is easily accessible in the engine bay on Express vans, making it one of the simpler electronic component replacements.
Will this fix a P0700 trouble code?
A P0700 code is a general fault indicating the TCM has detected a problem. While this module often resolves the root cause (like internal shorts or failed drivers that trigger other codes), you should always diagnose any accompanying codes (e.g., for specific solenoids) to confirm the TCM is the source of the issue.
Do I need to send my old part back?
No. There is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
Is this part compatible with other GM part numbers?
Yes, this T42 module is a direct replacement for a wide range of GM service numbers, including 24252114, 24234503, 24239224, 24240400, and others listed in the product details. It ensures broad compatibility across the GM lineup.