Get Your Work Van Back on the Job with a Reliable Transmission Fix
As a mechanic with over two decades of experience, I know that a Chevrolet Express 3500 isn’t just a vehicle—it’s a tool for your business. When it’s down, you’re losing money. One of the most common, and frustrating, issues I’ve seen on these workhorses is transmission failure caused by a faulty Transmission Control Module (TCM). Symptoms like harsh shifting, getting stuck in gear, or a lit check engine light can bring your operations to a halt. This isn’t just an inconvenience; it’s a direct hit to your bottom line.
This T42 Transmission Control Module is the definitive solution. It arrives at your door fully pre-programmed to your van’s specific VIN. That means no expensive trips to the dealership for programming and no complex setup. It’s a direct-fit, plug-and-play replacement designed to restore the crisp, reliable shifting your 4L80E transmission had from the factory. By precisely managing shift points, torque converter lockup, and line pressure, this module gets you back on the road quickly and confidently.
Is Your Express Van Showing These Red Flags?
A failing TCM can mimic other transmission problems, but there are tell-tale signs I look for during diagnosis. If your van is experiencing any of the following, a faulty TCM is a likely culprit:
- ✔ Harsh, slamming shifts or erratic gear changes that make driving unpredictable.
- ✔ The transmission feels like it’s slipping, or there’s a long delay when shifting from Park to Drive or Reverse.
- ✔ Your van is stuck in “limp mode,” usually in 2nd or 3rd gear, with no ability to upshift or downshift.
- ✔ The check engine light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Faults), or other communication errors.
- ✔ A sudden, noticeable drop in fuel economy or signs of the transmission overheating.
Case Study: The Slipping 4L80E
A contractor brought his 2011 Express 3500 into my shop, complaining of what he called “lazy, slipping shifts” and an occasional hard bang into gear. He was convinced his 4L80E transmission needed a full rebuild, a costly and time-consuming job. After plugging in my scan tool, I saw a P0700 code and a few intermittent solenoid circuit codes. Instead of jumping to a mechanical failure, I inspected the TCM. After swapping it with a known-good unit, the van shifted perfectly. The original module had failed internally, sending erratic signals. By replacing just the 2006-2014 Express 3500 TCM, we saved him thousands of dollars and got his van back to work the same day.
A Straightforward Guide to Installation
One of the best parts about this solution is its simplicity. You don’t need a vehicle lift or specialized transmission tools. For the Express van, the process is especially easy.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- Locate the TCM: On the 2006-2014 Express 3500, the TCM is conveniently located in the engine compartment on the right-hand (passenger) side. You can’t miss it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely plug in the electrical connectors. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always good practice to use a basic scan tool to clear any stored DTCs from the system’s memory. Start the vehicle and enjoy smooth shifting!
Why Choose Our Programmed TCM?
This isn’t just a part; it’s a complete repair solution. The critical VIN programming is done *before* we ship, using the latest GM software updates. This ensures your new 2006-2014 Express 3500 TCM communicates flawlessly with your van’s Engine Control Module (ECM) and other systems, delivering optimal performance and fuel efficiency right out of the box. Built to meet or exceed OEM specifications and backed by a one-year warranty, it’s a repair you can count on.
Verified Vehicle Compatibility
This T42 TCM, also known by part numbers 24252114, 24234503, 24239224, and others, is a direct fit for a wide range of GM vehicles. While this listing is focused on the Express Van, it is also compatible with the following models. Always verify your specific model and year.
- 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)
- Cadillac DTS, Buick Lucerne, Chevrolet Impala, and many more.
Frequently Asked Questions
Do I need to take my van to the dealer for this part?
Absolutely not. The main benefit of this TCM is that it comes pre-programmed to your vehicle’s VIN. This eliminates the need for any additional programming from a dealership, saving you time and money.
Is this a difficult part for a DIYer to install?
Not at all. For the Express Van, the TCM is located in an easily accessible spot in the engine bay. With basic hand tools, the replacement can be completed in under 30 minutes. Just disconnect the battery, swap the modules, and reconnect.
What is a core charge? Do I have to send my old part back?
There is no core charge for this part. You can keep your old module or dispose of it yourself, making the process simpler and hassle-free.
Will this fix a P0700 check engine light code?
A P0700 code is a general code indicating the TCM has detected a fault. Often, replacing a faulty TCM will resolve the P0700 and any related solenoid or sensor codes. However, you should always ensure the wiring and solenoids are in good condition as well.
How do I provide my VIN for programming?
During the checkout process, you will be prompted to enter your vehicle’s 17-digit VIN. We cannot ship the module without it, as the programming is specific to your van.