Get Your Workhorse Back on the Road with a Reliable, Programmed TCM
If your 2006-2014 Chevrolet Express 3500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is very likely a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can bring your work to a grinding halt. This T42 TCM, interchangeable with part number 24256960, is the definitive solution to restore your van’s performance and reliability. Forget expensive dealership visits for programming—we handle it for you. Simply provide your VIN at checkout, and this module arrives at your door ready for a plug-and-play installation.
Case Study: A Tricky Diagnosis
I had a 2011 Express 3500 cargo van come into my shop last month. The owner, a local plumber, was frustrated. His van would randomly refuse to shift out of 2nd gear (limp mode) and the check engine light was on. He’d already replaced two shift solenoids based on a generic code reader, but the problem persisted. After hooking up my professional scan tool, I saw the telltale signs: a generic P0700 code (Transmission Control System Malfunction) and intermittent communication loss with the TCM. In my experience, especially with these work vans that see high mileage and engine bay heat, the internal electronics of the TCM are the first to go. We installed one of our VIN-programmed T42 modules, and in less than 30 minutes, the van was shifting perfectly. It’s a classic failure I’ve seen hundreds of times, and a direct replacement is the only long-term fix.
Is Your Express Van Showing These Telltale Signs?
A failing TCM doesn’t heal itself; it only gets worse. If you’re experiencing any of the following, it’s time for a replacement:
- 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, U0100, P0750, or other solenoid-related faults.
- âś” A sudden drop in fuel economy.
- âś” The transmission seems to slip between gears or fails to downshift when slowing down.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation, which most DIYers can complete in under half an hour with basic hand tools. For the Chevrolet Express and GMC Savana vans, the process is very consistent.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On your 2006-2014 Express 3500 TCM, you will find the module in the engine compartment, mounted on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the locking tabs to avoid damage. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a scan tool to clear any stored fault codes from the vehicle’s memory to ensure a clean start.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2006-2014 Express 3500 TCM, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express 1500/2500/3500 (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado 1500/2500 (07-13), SSR (05-06), Suburban 1500 (07-08), Tahoe (07-09)
- GMC: Canyon (08-12), Envoy / Envoy XL (06-09), Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon / Yukon XL 1500 (07-09)
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06), Montana (06-09), Torrent
- Cadillac: DTS (06-11)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you time and the high cost of dealership programming.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause that sets this code. Replacing the module with our programmed unit is a very common and effective fix for this and related transmission codes.
Is this a difficult part to replace myself?
Not at all. For most vehicles, including the Express Van, this is a straightforward DIY job that requires only basic hand tools and can be completed in under 30 minutes. Its location in the engine bay makes it easily accessible.
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 shipping it back to us.
What kind of warranty is included?
This module is backed by our one-year warranty, giving you peace of mind that you’re installing a quality, reliable part in your vehicle.