Get Your Express Van Back in Service, Fast.
When your Chevrolet Express 3500 is your business, a transmission problem isn’t just an inconvenience—it’s a direct hit to your bottom line. Unpredictable shifting, a lit check engine light, or a van stuck in limp mode means lost time, canceled jobs, and mounting frustration. This is the no-nonsense, reliable solution to get your workhorse back on the road. This genuine GM T42 Transmission Control Module (TCM) arrives pre-programmed to your vehicle’s specific VIN, making it a true plug-and-play fix that restores the dependable performance you rely on every day.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing TCM is the most likely culprit. This module is engineered to be the definitive solution, eliminating the guesswork and costly diagnostic fees. Stop chasing symptoms and replace the core problem.
- Harsh, Erratic, or Delayed Shifting: Clunky gear changes or a transmission that seems to have a mind of its own.
- Stuck in Limp Mode: The vehicle refuses to shift out of 2nd or 3rd gear, severely limiting speed and power.
- Check Engine Light On: Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other transmission-related codes are present.
- No Upshift or Downshift: The transmission fails to shift gears as engine RPMs increase or decrease.
- Poor Fuel Economy & Overheating: Inefficient shifting forces the engine to work harder, burning more fuel and putting extra strain on the transmission.
Features & Benefits
- ✔ VIN Programmed & Ready to Install: This module is flashed with your vehicle’s unique VIN and the latest GM software updates before it ships. This eliminates the need for expensive dealership programming or specialized scan tools, saving you time and money.
- ✔ Restores Smooth Shifting Performance: By precisely controlling shift points, line pressure, and torque converter lockup, this module brings back the crisp, predictable shifting your transmission had from the factory.
- ✔ Clears Critical Trouble Codes: A properly functioning programmed T42 transmission control module is the direct fix for a host of common transmission-related DTCs that trigger the check engine light.
- ✔ Engineered for Durability: Built to strict OEM standards to withstand the demanding conditions of a work vehicle, ensuring long-term reliability whether you’re hauling cargo or transporting passengers.
- ✔ This unit is backed by our one-year replacement warranty.: Drive with confidence knowing your purchase is protected.
- ✔ No Core Charge Required: Keep your old part without the hassle or expense of returning a core.
From the Shop Floor: A Veteran Tech’s Tip
“I’ve seen it a dozen times. A customer comes in with a van that’s shifting hard, convinced they need a new transmission. Before condemning the whole unit, the first thing we check is the TCM. These T42 modules are known points of failure, but the fix is often surprisingly simple. A faulty module can mimic major mechanical failure perfectly. Swapping in a pre-programmed unit like this one has saved my customers thousands of dollars and days of downtime. It’s the smartest first step for any GM truck or van from this era with shifting issues.”
Whether you’re a fleet manager keeping your vehicles in top condition or a hands-on owner who can’t afford to be off the road, this programmed T42 transmission control module is the most efficient and effective solution. It provides the reliability of an OEM part with the convenience of a ready-to-install component. Don’t let a small electronic part sideline your entire operation. This is the fix you need to get back to work with confidence. Installing this programmed T42 transmission control module is a straightforward job that can be done in your own garage or shop, restoring your vehicle’s performance and dependability.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 Transmission Control Module (TCM) is the ‘brain’ of your automatic transmission. It receives data from various vehicle sensors to control exactly when and how the transmission shifts gears, ensuring smooth operation, optimal performance, and fuel efficiency.
Is this module truly plug-and-play?
Yes. We program the module to your vehicle’s specific VIN before shipping. This means it’s ready for installation right out of the box with no additional programming or dealership visits required. Simply disconnect the battery, swap the modules, and reconnect the battery.
Will this fix a P0700 trouble code?
A P0700 code indicates a general fault within the transmission control system. While it can be caused by other issues, a failing TCM is a very common cause. Replacing a faulty TCM with this programmed unit will often resolve the P0700 code and any related specific solenoid codes.
Where is the TCM located on my Express Van?
On most 2006-2014 Savana and Express vans, the TCM is located in the engine compartment on the right-hand (passenger) side. Always confirm the location on your specific vehicle before beginning work.
Do I need to return my old part (core)?
No. This part is sold without a core charge. You are free to keep or dispose of your old module, saving you the time and hassle of a core return.
What if I have questions during installation?
Our team of experts is here to help. If you have any questions about your part or the installation process, don’t hesitate to contact our support team for knowledgeable assistance.