End Transmission Headaches in Your Work Van
As a technician with over two decades of experience, I know that when a workhorse like your Chevrolet Express 3500 Van is down, every minute costs you money. Erratic shifting, getting stuck in gear, or a glowing check engine light are more than just annoyances—they’re threats to your livelihood. This T42 Transmission Control Module (TCM), part number 24235340, is the definitive, reliable solution to get your van’s automatic transmission operating like new again. It’s the brain behind your transmission’s brawn, managing every shift point, torque converter lockup, and pressure regulation to restore the smooth, predictable performance you depend on.
Case Study: A Tricky Diagnosis
I once had a local delivery company bring in their 2011 Express 3500. The driver complained of intermittent, violent shifts and occasional ‘no-go’ situations after a stop. No consistent codes were stored, just a generic P0700 (Transmission Control System Malfunction) now and then. After ruling out wiring and solenoids, we suspected the TCM. The internal circuitry, stressed from heat cycles and constant use, was failing intermittently. Swapping in a VIN-programmed T42 module didn’t just fix the problem—it restored the driver’s confidence and got their van back on its route the same afternoon, saving them from a costly and time-consuming dealer visit.
Why Your 2006-2014 Express 3500 TCM is a Critical Component
The TCM is a small computer with a huge job. It takes data from engine speed, vehicle speed, and throttle position sensors to decide the perfect moment to shift gears. When it starts to fail, the symptoms can range from subtle to catastrophic. Our module is pre-programmed specifically to your van’s Vehicle Identification Number (VIN), ensuring it has the latest GM software and communicates flawlessly with your vehicle’s other systems right out of the box. This isn’t just a replacement part; it’s a restoration of your vehicle’s core operational integrity.
Is Your Express Van Exhibiting These Telltale Symptoms?
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ The check engine light or transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid codes), or other transmission-related faults.
- ✔ A noticeable drop in fuel economy or a transmission that seems to be overheating.
- ✔ Complete loss of communication with the TCM, leading to a no-shift condition.
Straightforward Installation Guide for Your Express Van
For the Chevy Express and its GMC Savana counterpart, this job is refreshingly simple and can be done in under 30 minutes with basic hand tools. This makes it a perfect fix for both professional shops and capable DIYers.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the Module: On the 2006-2014 Express/Savana vans, the TCM is conveniently located in the engine compartment on the right-hand (passenger) side, typically near the firewall or inner fender.
- Disconnect and Remove: Carefully unclip the electrical connectors. Press the release tabs firmly and pull straight out. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, VIN-programmed module into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While the system may reset, it’s best practice to use a basic OBD-II scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. While this page focuses on the Express 3500, it also fits the following models (please verify location notes):
- CHEVROLET EXPRESS 1500/2500/3500 VAN (2006-2014): Transmission; (RH engine compartment)
- GMC SAVANA 1500/2500/3500 VAN (2006-2014): Transmission; (RH engine compartment)
- CHEVROLET SILVERADO & GMC SIERRA (2007-2013): Transmission; (next to battery)
- CHEVROLET TAHOE & GMC YUKON (2007-2009): Transmission; (next to battery)
- CHEVROLET COLORADO & GMC CANYON (2008-2012): Transmission; (RH rear engine compartment)
- HUMMER H3 (2008-2010): Transmission; (RH rear engine compartment)
- CHEVROLET IMPALA (2006-2011): Transmission; (lower air cleaner housing)
- BUICK LACROSSE / ALLURE (2006-2009): Transmission; (lower air cleaner housing)
- CADILLAC DTS (2006-2011): Transmission; (RH front engine compartment)
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What exactly is VIN programming and why do I need it?
VIN programming loads your vehicle’s specific software and calibration files onto the module before it ships. This ensures the TCM works perfectly with your engine, axle ratio, and tire size. It makes the installation truly plug-and-play, eliminating the need for an expensive programming session at a dealership.
Will I have to take my van to a dealer after installing this?
No. Because we program the module to your VIN, no further programming or setup is required. You can install it yourself or have your local mechanic do it without needing any special GM diagnostic tools.
Is this a common problem on the Express 3500 Van?
Yes, TCM failure is a well-documented issue across this generation of GM vehicles. The combination of under-hood heat, vibration, and age can cause the delicate internal electronics to fail, leading to the symptoms described.
What is the warranty on this part?
This module comes with a one-year, hassle-free warranty, giving you peace of mind that you’re investing in a quality, reliable part.
Do you need my old part back (core charge)?
No, there is absolutely no core charge. You can keep your old module or dispose of it at your convenience, simplifying the repair process for you.