Fix Your Van’s Shifting Problems for Good
As a mechanic with over two decades of experience, I’ve seen countless Chevrolet Express vans come into the shop with frustrating transmission issues. The driver reports harsh bangs into gear, a refusal to shift, or the dreaded check engine light that puts the whole van into limp mode. More often than not, the culprit is a failing T42 Transmission Control Module (TCM). This isn’t just an annoyance; for a work vehicle, it’s a critical failure that costs you time and money. That’s why we offer this direct-fit, VIN-programmed 2006-2014 Express 1500 TCM as a reliable, straightforward solution.
This module, also known by service number 24256960, is the brain of your automatic transmission. It precisely controls shift points, manages torque converter clutch engagement, and communicates with the main engine computer (ECM) to ensure smooth, efficient operation. When it fails, your van’s performance and reliability plummet. Our T42 TCM is programmed specifically to your vehicle’s VIN before it ships, eliminating the need for expensive dealership programming. It arrives ready to install, allowing you to get your workhorse back on the road quickly.
A Technician’s Notebook
I remember a 2011 Express 2500 that came in with a classic P0700 (Transmission Control System Malfunction) code and intermittent ‘stuck in 3rd gear’ symptoms. The owner, a plumber, was losing jobs because he couldn’t trust his van. After confirming power and ground at the TCM connector were good, we suspected the module itself. The internal electronics on these T42s can fail from years of heat cycles. We installed one of our VIN-programmed modules, and the fix was immediate. The van shifted perfectly on the test drive, and all codes were cleared. It’s a textbook repair that saves drivers from a potential transmission rebuild.
Is Your Express Van Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ Complete loss of upshifting or downshifting capability.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission seems to be slipping or overheating.
A Straightforward Guide to Installation
Replacing the 2006-2014 Express 1500 TCM is a job most DIYers or any professional can handle in under 30 minutes. On the Express and Savana vans, the module is typically located in the engine compartment on the right-hand (passenger) side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: Find the module on the RH side of the engine bay. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic scan tool to clear any stored DTCs from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24256960 and is interchangeable with many other GM service numbers. While it is a perfect fit for the 2006-2014 Express 1500 TCM application, it also fits a wide range of other GM vehicles, including:
- Chevrolet Silverado, Tahoe, Suburban, Colorado, Impala, Cobalt, HHR
- GMC Sierra, Yukon, Savana, Canyon
- Buick LaCrosse, Lucerne, Rainier
- Cadillac DTS
- Pontiac G6, Grand Prix
- Hummer H3
- And more… See the full fitment list for details.
What does ‘VIN Programmed’ mean?
What does ‘VIN Programmed’ mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your van’s engine computer and other systems right out of the box, just like an OEM part from a dealership, but without the extra cost and hassle of a programming appointment.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools, such as a socket set to remove the mounting bolts and a tool to disconnect the battery, are all you need. The installation is designed to be a simple bolt-off, bolt-on process.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases where the TCM itself has failed internally, replacing it with our pre-programmed module will resolve the P0700 and any related transmission codes. However, you should always ensure the wiring and transmission components (like solenoids) are in good condition.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of needing to ship it back to us, saving you time and money.