Is Your Express 3500 Van Shifting Erratically?
If you’re dealing with harsh shifting, delayed gear engagement, or your 2006-2014 Chevrolet Express 3500 is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. This critical component is the brain of your automatic transmission, responsible for managing shift points, torque converter lockup, and line pressure. A faulty TCM can disrupt your van’s performance, hurt fuel economy, and potentially lead to more severe transmission damage if left unaddressed.
From the Diagnostic Bay
We recently had a 2011 Express 3500 work van towed to the shop. The owner, a local plumber, said it was stuck in third gear and the check engine light was on. He was losing money every hour the van was down. A quick scan showed a P0700 (Transmission Control System Malfunction) code and several solenoid circuit codes. After confirming the wiring harness was intact, we identified a failed TCM. We installed one of our VIN-programmed T42 modules, cleared the codes, and had him back on the road in under an hour. He was thrilled to avoid a costly dealership visit and get back to his customers without delay.
The Direct-Fit Solution: A VIN-Programmed 2006-2014 Express 3500 TCM
This genuine OEM-quality T42 Transmission Control Module is the definitive solution for your transmission woes. Unlike generic modules that require expensive and time-consuming dealership programming, this unit arrives at your door pre-programmed to your van’s specific Vehicle Identification Number (VIN). This ensures flawless communication with your vehicle’s other computers, like the Engine Control Module (ECM), for optimal performance right out of the box. It’s a true plug-and-play fix that restores the smooth, reliable shifting you expect from your workhorse van.
Symptoms of a Failing T42 Transmission Control Module
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear, with severely limited power.
- ✔ Your dashboard illuminates with the Check Engine Light or a specific transmission warning light.
- ✔ Diagnostic scans reveal transmission-related Diagnostic Trouble Codes (DTCs), such as P0700, P0750, or other solenoid-specific faults.
- ✔ A noticeable decrease in fuel efficiency as the transmission fails to operate in the optimal gear.
- ✔ The transmission may refuse to upshift or downshift, or may feel like it’s slipping between gears.
- ✔ In severe cases, a complete loss of communication with the module can lead to the transmission not engaging at all.
Easy Installation to Get You Back on the Road
Replacing the TCM on your Express 3500 is a straightforward job that can be completed with basic hand tools. On most Savana and Express vans from 2006-2014, the module is conveniently located in the engine compartment on the right-hand (passenger) side. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it from its bracket, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation. With no core charge, you can keep your old part without the hassle of returns.
This module is a direct replacement for multiple part numbers, including 24242391, 24234503, 24252114, and 24240400. It is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. By choosing our VIN-programmed 2006-2014 Express 3500 TCM, you are ensuring a reliable, long-term repair that restores your vehicle’s factory performance.
Frequently Asked Questions
Do I need to program this module?
No. This Transmission Control Module comes pre-programmed to your vehicle’s specific VIN. This makes the installation process plug-and-play, with no need for an expensive trip to the dealership for programming.
Where is the TCM located on my 2011 Express 3500?
On the 2006-2014 Chevrolet Express and GMC Savana vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side, mounted near the firewall or inner fender.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a common cause, this code can also be triggered by other issues like bad solenoids or wiring. However, if you are experiencing shifting problems along with a P0700 code, replacing the TCM is often the correct solution.
Is a core charge required for this part?
No, there is no core charge for this module. You are not required to send your old, faulty part back to us, saving you time and shipping costs.
What transmissions is this T42 module compatible with?
This T42 TCM is designed for vehicles equipped with GM’s 4-speed automatic transmissions, including the popular 4L60E, 4L65E, 4L70E, and 4L80E models found in a wide variety of trucks, vans, and SUVs from 2006-2014.