Restore Your Van’s Shifting Performance
If your 2006-2014 Chevrolet Express 3500 Van is suffering from delayed shifts, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can sideline a perfectly good work van. This T42 TCM, service part number 24255280, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership visits and gets your van back on the road, performing reliably day in and day out.
A Technician’s Notebook: The Intermittent Shifting Nightmare
I remember a fleet customer with a 2011 Express 3500 that had a ghost in the machine. The driver complained of random, violent downshifts on the highway, but by the time it got to the shop, it would behave perfectly. No codes, no reproducible symptoms. Other shops had replaced fluid and solenoids to no avail. After hooking up my scanner for a long road test, I saw the TCM voltage intermittently drop just before the harsh shifts. The internal circuits were failing under load and heat. We installed one of these VIN-programmed T42 modules, and the problem was solved permanently. It’s a classic failure mode for these hard-working vans, and a new module is the only reliable fix.
Is Your Express Van Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching the signs early can save you from being stranded. Look out for these common symptoms:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” The vehicle is stuck in a single gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related faults.
- âś” Poor acceleration and decreased fuel economy.
- âś” The transmission feels like it’s slipping between gears.
Your Solution: A Pre-Programmed 2006-2014 Express 3500 TCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We handle the complex part—the programming—so you can handle the simple installation. By programming the module with the latest GM software updates tied to your VIN, we ensure it communicates flawlessly with your van’s Engine Control Module (ECM) and other systems right out of the box. This restores precise shift points, proper torque converter lockup, and reliable operation, making it the ideal choice for both professional mechanics and DIY-savvy van owners.
Get Your Van Back to Work: A 30-Minute Install Guide
- âś” Safety First: Park on a level surface and disconnect the negative terminal from your vehicle’s battery. This prevents electrical shorts and helps reset the vehicle’s computer systems.
- âś” Locate the TCM: On the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side. It’s a silver box with electrical connectors.
- âś” Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. Keep the bolts handy for the new part.
- âś” Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring the clips click into place.
- âś” Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. While not always necessary, using a basic scan tool to clear any stored DTCs is a good final step.
Verified Compatibility for Your GM Vehicle
While this is a direct-fit part for the 2006-2014 Express 3500 Van, this versatile T42 module also fits a wide range of other GM vehicles. It is interchangeable with part numbers 24252114, 24234503, 24230461, and others. Please verify your specific model in the list below:
- Chevrolet: Express/Savana 1500/2500/3500 (06-14), Silverado/Sierra (07-13), Tahoe/Yukon (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11), and more.
- GMC: Savana/Express, Sierra/Silverado, Yukon, Envoy (06-09), Canyon/Colorado (08-12).
- Buick: LaCrosse (06-09), Lucerne (06-11).
- Cadillac: DTS (06-11).
- Pontiac: G6 (06-10), Grand Prix (06-08).
- Saturn: Vue (07-10), Aura (07-09).
- Hummer: H3 (08-10).
- Saab: 9-7X (06-09).
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. This module comes fully programmed to your vehicle’s VIN. The service is included in the price, making this a true plug-and-play installation with no additional programming required.
Is this part difficult to install myself?
Not at all. For most DIYers with basic hand tools, this is a straightforward job that can be completed in under 30 minutes. The module is easily accessible in the engine bay of the Express van.
What is the warranty on this TCM?
This part is backed by our comprehensive one-year warranty, giving you peace of mind that you’re installing a quality, dependable component.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the ECM to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, you should scan for more specific P-codes (like solenoid or sensor faults) to confirm the diagnosis. In many cases where the TCM is the root cause, this part will be the solution.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of returning it.