If your 2006-2014 Chevrolet Express 2500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just inconvenienced—you’re losing time and money. As a technician with over two decades of experience, I know that for a workhorse like the Express Van, reliability isn’t a luxury; it’s essential. A faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. This T42 TCM, corresponding to part number 24234503, is the definitive solution to restore your transmission’s performance and get your van back on the road, operating as it should.
A Technician’s Notebook: The Case of the Limping Work Van
I remember a fleet manager bringing in a 2011 Express 2500 cargo van. The driver reported it would suddenly refuse to shift past 2nd gear—classic limp mode. He’d already replaced a couple of solenoids hoping for a cheap fix, but the problem persisted intermittently. We scanned it and pulled a P0700 (Transmission Control System Malfunction) and a U0101 (Lost Communication with TCM). Instead of chasing electrical ghosts, we went straight to the source. The original TCM was failing internally, a common issue due to heat cycles and vibration. We installed a VIN-programmed T42 module, cleared the codes, and the van was back in service the same afternoon. That’s the difference between guessing and diagnosing—and why a quality, pre-programmed part is the only real fix.
Is Your Express Van Showing These Symptoms?
A failing TCM doesn’t heal itself; it only gets worse. If you’re experiencing any of the following, it’s time to take action before you cause more serious damage to your transmission. This module is the solution for the common issues associated with a faulty 2006-2014 Express 2500 TCM.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔ The Check Engine Light or a transmission warning light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758 (solenoid circuits), or communication errors are present.
- ✔ Inconsistent or no response from the transmission when shifting.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
Straightforward Installation Guide
One of the biggest advantages of this module is that it arrives programmed to your van’s specific VIN. This eliminates the need for expensive dealership programming. Installation is a job most DIYers or any professional mechanic can handle in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help 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. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a standard OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2006-2014 Express 2500 TCM, it is also compatible with the following models:
- Chevrolet Express/GMC Savana 1500, 2500, 3500 (2006-2014)
- Chevrolet Silverado/GMC Sierra 1500, 2500 (2007-2013)
- Chevrolet Tahoe/GMC Yukon (2007-2009)
- Chevrolet Impala, Cobalt, HHR, Monte Carlo
- Buick LaCrosse, Lucerne
- Cadillac DTS
- Pontiac G6, Grand Prix
- And many more. Please verify your part number (interchanges with 24242391, 24252114, etc.) for a perfect match.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you time and money.
What is the warranty on this part?
This TCM comes with a one-year warranty, giving you peace of mind that you’re installing a reliable, quality component.
Is there a core charge for my old TCM?
No, there is no core charge. You can keep your old part without any hassle or need to return it.
Will this fix a P0700 code?
A P0700 code is a general transmission fault code. While a failing TCM is a very common cause, you should always diagnose the specific codes that accompany it. This module directly resolves failures within the TCM itself, which often trigger a P0700.
Where is the TCM located on my Express 2500 Van?
On the 2006-2014 Express and Savana vans, the Transmission Control Module is located in the engine bay, on the right-hand (passenger) side. It’s a silver box with electrical connectors.