Restore Peak Performance to Your Workhorse Van
Is your Chevrolet Express 3500 van suffering from shifting problems, leaving you stranded or dealing with an illuminated Check Engine light? A faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. This VIN-programmed T42 TCM, part number 24235753, is the definitive solution for your 2006-2014 Express 3500. As the central command for your 4L80E or other compatible GM automatic transmission, this module ensures every shift is smooth, timed correctly, and efficient, getting your van back to being the reliable workhorse you depend on.
Case Study: A Tricky Diagnosis
I remember a 2011 Express 3500 from a local delivery company that came into my shop. The driver complained of intermittent, bone-jarring shifts and occasionally getting stuck in ‘limp mode’ (3rd gear) halfway through his route. He’d already replaced two shift solenoids at another shop, but the problem persisted. We pulled the codes and saw a generic P0700. After checking the wiring harness for damage—a common issue on work vans—we focused on the module. We swapped in a pre-programmed T42 TCM, and the difference was immediate. The root cause wasn’t the solenoids themselves, but the TCM failing to command them correctly. This is a classic scenario I’ve seen hundreds of times; replacing the TCM saved the client from a potential transmission rebuild.
Is Your Express Van Showing These Symptoms?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are electronic and can be mistaken for other issues. If you’re experiencing any of the following, your TCM is the likely suspect:
- ✔ The transmission slams into gear, especially when cold.
- ✔ Delayed or hesitant shifting between gears.
- ✔ Your van is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ The Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ The torque converter fails to lock up at highway speeds, causing high RPMs.
A Straightforward Guide to Installation
One of the best features of this module is its simple, plug-and-play installation. Since we program it to your VIN before shipping, you can avoid a trip to the dealership. For the 2006-2014 Express 3500 TCM, the process is quick and requires basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard computers.
- Locate the Module: 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. Note the locking tabs to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. Use a basic OBD2 scan tool to clear any stored fault codes and take the van for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. While this page is focused on the Express 3500, it is also compatible with the following models. Always verify your part number (24235753) or contact us with your VIN to ensure perfect fitment.
This part fits, but is not limited to:
- Chevrolet: Express 1500/2500/3500 (06-14), Silverado 1500/2500 (07-13), Tahoe (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado (08-12)
- GMC: Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon (07-09), Envoy (06-09), Canyon (08-12)
- Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G6 (06-10), Grand Prix (06-08)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24240449, YNXS
Frequently Asked Questions
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software, including shift strategies and communication protocols, onto the module. Without it, the TCM won’t work correctly with your engine computer (ECM) and other systems, leading to the same problems you’re trying to fix. Our service eliminates the need for expensive dealership tools.
Is this a difficult part for a DIYer to replace?
Not at all. For most models, including the Express van, the TCM is easily accessible in the engine bay. With basic tools, the replacement should take less than 30 minutes. The key is our pre-programming service, which makes it a true plug-and-play repair.
Will this fix my ‘limp mode’ issue?
In many cases, yes. Limp mode is a protective measure triggered by the vehicle’s computer when it detects a critical transmission fault. A failing TCM is a very common cause of this condition. Replacing it often resolves the issue and restores full gear functionality.
Do I need to send my old part back (core charge)?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle or extra fees.
What kind of warranty comes with this part?
This transmission control module is backed by our comprehensive one-year warranty, giving you peace of mind that you’re installing a quality, reliable part in your vehicle.