Is Your Chevrolet Express Van Shifting Erratically?
Your 2006-2014 Chevrolet Express 1500 is a workhorse, but when the transmission starts acting up, it can bring your work to a halt. If you’re experiencing harsh shifting, getting stuck in gear, or seeing a persistent check engine light, a faulty Transmission Control Module (TCM) is the most likely culprit. This T42 TCM, service number 24235753, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair that restores factory performance.
From the Diagnostic Bay
We had a contractor come in with his ’11 Express 1500 work van. It was stuck in what he called ‘get-home mode’—it wouldn’t shift out of 3rd gear. He was convinced he needed a full transmission rebuild, a costly and time-consuming job. After plugging in our scanner, we saw a handful of solenoid circuit codes and the master P0700 code. Instead of quoting a transmission job, we checked the TCM. Sure enough, it had failed. We installed one of our VIN-programmed T42 modules, cleared the codes, and had him back on the road in under an hour. He saved thousands and avoided days of downtime, all because the real problem was this simple electronic component.
Symptoms of a Failing GM T42 TCM
- ✔ Harsh Shifting: Experiencing abrupt, jerky, or delayed gear changes that make driving uncomfortable and unpredictable.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift, often getting stuck in 2nd or 3rd gear as a protective measure.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes stored in the ECU include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (e.g., P0751, P0756).
- ✔ No Upshift or Downshift: The transmission fails to shift into higher gears as you accelerate or downshift as you slow down.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup issues can lead to a noticeable drop in MPG.
The Definitive Solution: A Programmed Express 1500 TCM
Don’t let a faulty module sideline your vehicle. This replacement T42 Express 1500 TCM is engineered to solve these complex issues efficiently. The most critical feature is our VIN programming service. Before we ship the part, we flash it with the latest GM software calibrated specifically for your vehicle’s Vehicle Identification Number. This eliminates the need for an expensive trip to the dealership for programming, ensuring the module works perfectly right out of the box. It communicates flawlessly with your van’s engine control unit (ECU) and other systems, restoring the precise, smooth shifting you expect.
Simple, Hassle-Free Installation
Replacing the TCM on your Express van is a straightforward process that can be completed with basic hand tools. On the 2006-2014 Savana and Express vans, the module is typically located in the right-hand (passenger side) engine compartment, making it easily accessible. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. Once installed, use a standard OBD2 scanner to clear any stored trouble codes to complete the reset process.
Frequently Asked Questions
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibrations onto the TCM. Without it, the module won’t know how to control your specific transmission, engine, and tire size combination, leading to continued shifting problems or a no-start condition. Our pre-programming service makes this a true plug-and-play part, saving you a trip to the dealer.
Will this module fit vehicles other than the Express 1500?
Yes. The T42 TCM was used across a wide range of GM vehicles from 2006-2014, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra, Yukon; and Buick LaCrosse, among others. This specific part number, 24235753, is compatible with many models, but it is essential to verify the fitment for your exact vehicle before ordering.
Is this a difficult part for a DIY mechanic to install?
For most individuals with basic mechanical skills, the installation is very manageable and typically takes less than 30 minutes. The module is usually in an accessible location in the engine bay. The key steps are disconnecting the battery, swapping the modules, and clearing any remaining codes with a scan tool.
Will this fix my P0700 check engine light code?
The P0700 code is a generic trouble code indicating that the TCM has detected a fault. While this code itself doesn’t pinpoint the problem, a failing TCM is very often the root cause that triggers it, along with more specific solenoid or sensor codes. Replacing a faulty module is the correct fix for these issues.
Do I need to return my old TCM?
No, there is no core charge or requirement to send your old part back. You can dispose of your old module at your convenience, making the repair process simpler and faster.