Restore Peak Transmission Performance to Your Chevy Express Van
Is your 2006-2014 Chevrolet Express 3500 van suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can disrupt your work schedule and leave your vehicle unreliable. This replacement T42 TCM, part number 24239926, is the definitive solution to restore your van’s drivability and dependability.
From the Diagnostic Bay
We recently had a 2011 Express 3500 work van come into the shop. The owner was frustrated with it constantly getting stuck in what felt like third gear—a classic limp mode symptom. The van was sluggish, burned through fuel, and the check engine light was on with a P0700 code. After confirming the solenoids and wiring were intact, we identified a faulty TCM. Instead of sending him to a dealership for a costly replacement and programming, we installed one of our VIN-programmed T42 modules. In under an hour, the van was shifting perfectly, the codes were cleared, and the owner was back on the road, ready for his next job. This is the exact fix your vehicle needs.
Symptoms of a Failing 2006-2014 Express 3500 TCM
A failing TCM can manifest in several ways, often starting as intermittent issues before becoming persistent problems. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh Shifting & Delayed Engagement: Your van may slam into gear, hesitate when shifting, or feel like it’s slipping between gears.
- ✔ Stuck in Limp Mode: The transmission may refuse to shift out of a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): A scan tool may reveal codes like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other transmission-related faults.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup issues caused by a bad TCM can lead to a noticeable drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM, indicating a complete module failure.
The Plug-and-Play Advantage: Pre-Programmed to Your VIN
The biggest hurdle when replacing a modern electronic module is programming. A new TCM from the dealership requires expensive, specialized tools to sync it with your vehicle’s Vehicle Identification Number (VIN). Our modules eliminate this step entirely. We pre-program this 2006-2014 Express 3500 TCM with the latest GM software updates using your specific VIN. This ensures it works seamlessly with your van’s engine and other systems right out of the box. There is no need for a trip to the dealer, saving you time and money.
This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, 24239926, and 24256960. It is designed to meet or exceed original equipment specifications, providing a reliable, long-term solution for your transmission woes. Built with quality components and backed by a one-year warranty, you can install it with confidence.
Installation Guide
Installation is straightforward for a DIY mechanic. On the 2006-2014 Savana and Express vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side. Before you begin, disconnect the negative battery terminal to prevent electrical shorts and help reset the vehicle’s computer systems. Simply unbolt the old module, carefully disconnect the wiring harnesses, and install the new one in its place. After reconnecting the battery, use a standard OBD2 scan tool to clear any stored diagnostic trouble codes. The entire process can often be completed in under 30 minutes.
Frequently Asked Questions
What does this T42 TCM do for my Express 3500?
The T42 Transmission Control Module acts as the computer for your 4L60E, 4L65E, or 4L80E automatic transmission. It receives data from various sensors and controls shift solenoids, line pressure, and torque converter lockup to ensure smooth and efficient gear changes.
Is this module truly plug-and-play?
Yes. By providing your vehicle’s VIN during checkout, we program the module specifically for your Express van. This means it requires no additional programming or dealership visits. Simply install it, clear any old codes, and you’re ready to drive.
Where is the TCM located on my 2006-2014 Express 3500?
For the Express and Savana vans in this year range, the TCM is found in the engine compartment, mounted on the right-hand (passenger) side. Always confirm the location before beginning work.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (such as internal failure), it’s essential to ensure the transmission wiring and solenoids are in good condition. In many cases, replacing a faulty TCM will clear the P0700 and related codes.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any hassle or additional fees.