Get Your Workhorse Back on the Road: A Reliable Fix for Your Express Van’s Transmission
If your 2006-2014 Chevrolet Express 3500 Van is your business, you know that downtime isn’t just an inconvenience—it’s lost revenue. When your transmission starts acting up with harsh shifts, getting stuck in gear, or throwing warning lights, the problem often points directly to a failing Transmission Control Module (TCM). In my 20+ years of diagnostics, I’ve seen countless work vans sidelined by faulty electronics. This T42 TCM, part number 24238856, is the definitive solution to restore the dependable performance your business relies on.
This isn’t just a replacement part; it’s a complete, hassle-free fix. We pre-program each module to your van’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures it communicates perfectly with your vehicle’s systems right out of the box, eliminating the need for an expensive and time-consuming trip to the dealership for programming. It’s designed to directly address common transmission-related Diagnostic Trouble Codes (DTCs) and restore the smooth, predictable shifting you need for heavy-duty work.
Case Study: A Tricky Diagnosis
A local contractor brought his 2011 Express 3500 into my shop, frustrated with an intermittent problem. The van would occasionally refuse to shift out of 2nd gear, but only after it was fully warmed up and had been running for a few hours. No check engine light was on, but a scan showed a stored P0700 code. We checked the fluid and solenoids, which were fine. The issue was heat-soak affecting the internal circuits of the original TCM. We installed one of these VIN-programmed T42 modules, and the problem was solved instantly. He was back on the job site the same afternoon, avoiding a multi-day stay at the dealer.
Is Your Work Van Showing These Red Flags?
- ✔ Unpredictable or harsh gear changes that slam into gear.
- ✔ The transmission feels like it’s slipping or hesitating to engage.
- ✔ Vehicle is stuck in ‘limp mode,’ often in 2nd or 3rd gear, with limited power.
- ✔ The check engine light or a transmission-specific warning is illuminated on your dash.
- ✔ Your scanner is showing codes like P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy or signs of the transmission running hotter than usual.
DIY Installation: Get Your Van Back to Work in Under an Hour
This 2006-2014 Express 3500 TCM is designed for a straightforward installation that a fleet mechanic or a capable DIYer can handle with basic tools. For the Express/Savana platform, it’s a very accessible part.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the Express and Savana vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical harnesses, making sure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any old fault codes from the vehicle’s memory. Start the engine and test drive to confirm smooth shifting.
Verified Compatibility for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24238856 and is interchangeable with a wide range of other service numbers. While it’s the perfect solution for your Express 3500, it also fits many other GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. Please verify your specific model in the list below:
Fits Models Including: Chevrolet Express/Savana 1500/2500/3500 (06-14), Silverado/Sierra 1500/2500 (07-13), Tahoe/Yukon (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado/Canyon (08-12), Hummer H3 (08-10), Cadillac DTS (06-11), Buick Lucerne (06-11), and many more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This is the biggest benefit. We program the module to your vehicle’s VIN before shipping, so it arrives ready for plug-and-play installation. This saves you hundreds in dealership fees and time.
What does the Transmission Control Module (TCM) do?
The TCM is the ‘brain’ of your automatic transmission. It collects data from various sensors and controls hydraulic pressure via solenoids to manage when and how your vehicle shifts gears, as well as torque converter lockup for fuel efficiency.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable job. On the Express Van, the TCM is easily accessible in the engine bay. The entire process typically takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault code indicating the TCM has detected a problem. While this module often resolves the root cause (an internal TCM failure), it’s important to ensure other components like wiring or solenoids are not the issue. However, in our experience, a faulty TCM is the most common culprit.
Is there a core charge for my old part?
No, there is no core charge required for this module. You can keep your old part without the hassle of returning it.