Is Your Chevy Express Van Shifting Erratically or Stuck in Gear?
As a mechanic with over two decades of experience, I know that for a workhorse like the Chevrolet Express 1500, transmission problems mean lost time and money. When your van starts slamming into gear, refusing to shift, or the check engine light comes on with transmission codes, the culprit is often a failing Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. The TCM is the brain of your automatic transmission, and when it malfunctions, your vehicle’s reliability is compromised.
The Direct-Fit Solution: A Pre-Programmed T42 TCM
This OEM-quality T42 Transmission Control Module, part number 24235753, is the definitive solution for your van’s shifting woes. The most significant benefit is that it arrives at your door pre-programmed to your Express 1500’s specific Vehicle Identification Number (VIN). This completely eliminates the need for expensive and time-consuming trips to the dealership for programming. It’s a true plug-and-play fix designed to get your van back on the road quickly and reliably.
Expert Pro Tip: Don’t Mistake a Bad Module for Bad Solenoids
In my shop, I’ve seen countless cases where owners or other technicians have spent hundreds of dollars replacing transmission solenoids, only to find the problem persists. Intermittent shifting issues, false solenoid codes (like P0750-P0758), and communication errors are classic signs of a failing T42 TCM. Before you drop the transmission pan, consider the module. A faulty TCM can send incorrect signals, making perfectly good solenoids appear to be failing. Replacing the module first often resolves these ghost codes and saves a lot of unnecessary labor.
Symptoms of a Failing 2006-2014 Express 1500 Transmission Control Module
If you’re experiencing any of the following, a faulty TCM is the likely cause:
- โ Harsh, delayed, or erratic gear shifts that feel like the transmission is slamming or slipping.
- โ Vehicle is stuck in “limp mode” (usually locked in 2nd or 3rd gear).
- โ The Check Engine Light or Transmission Warning Light is illuminated.
- โ Diagnostic Trouble Codes (DTCs) such as P0700 (Transmission Control System Malfunction) or other transmission-related codes are present.
- โ Complete failure to shift up or down, leading to poor acceleration and terrible fuel economy.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new TCM is a straightforward process that you can do in your own driveway in under 30 minutes. For the Express and Savana vans, the module is easily accessible.
- 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 2006-2014 Express 1500, the Transmission Control Module is located in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. 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 connectors. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Guaranteed Compatibility and Reliability
This module is built to strict OEM standards for lasting performance and is a direct replacement for a wide range of part numbers, including 24235753, 24242391, 24234503, 24252114, and more. It is designed to restore the precise electronic control over your 4L60E or 4L80E transmission, ensuring smooth operation for years to come. With a one-year warranty and no core charge, you can make this essential repair with complete confidence.