If your 2006-2014 Chevrolet Express 3500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re dealing with a vehicle that can’t be trusted. As a workhorse, your Express Van’s reliability is non-negotiable. A faulty Transmission Control Module (TCM) is often the culprit, acting like a confused brain that can no longer command the transmission properly. This replacement T42 TCM, part number 24240449, is the definitive solution to restore your van’s performance and your peace of mind.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your van’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures the module communicates flawlessly with your van’s powertrain, eliminating the need for an expensive and time-consuming trip to the dealership for programming. You get a true plug-and-play component that resolves the root cause of your transmission woes.
From the Diagnostic Bay: The Ghost in the Transmission
I once had a local delivery company bring in their Express 3500. The driver complained of intermittent, violent shifts and occasionally getting stuck in 3rd gear (limp mode), but the problem would vanish after restarting the van. We couldn’t replicate it consistently in the shop. After checking the fluid and solenoids, which were fine, we hooked up a high-end scanner and monitored the TCM data during a long test drive. We saw the command signals from the TCM drop out randomly. It was a classic case of internal TCM failure caused by years of heat cycles and vibration. A new, VIN-programmed module fixed it instantly, saving the company from costly downtime and a potential transmission rebuild.
Is Your Express Van Showing These Telltale Signs?
A failing Express 3500 Van TCM can manifest in several ways. If you’re experiencing any of the following, it’s highly likely your TCM is the problem:
- ✔ Unpredictable, harsh, or delayed gear shifts that make driving feel unsafe.
- ✔ The vehicle is stuck in “limp mode,” usually second or third gear, with no ability to upshift or downshift.
- ✔ Your check engine light or a specific transmission warning light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the generic P0700 (Transmission Control System Malfunction) or specific solenoid codes like P0750-P0758.
- ✔ A noticeable drop in fuel economy as the transmission isn’t operating in the optimal gear.
- ✔ Complete loss of communication with the transmission, leading to a no-shift condition.
A Straightforward Guide to Your TCM Installation
Replacing the TCM on your Express Van is a job most DIYers or any professional mechanic can handle in under 30 minutes. It’s located in an accessible spot, and no special tools are needed.
- Step 1: Safety First Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Step 2: Locate the Module On the 2006-2014 Express Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Step 3: Disconnect and Remove Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Step 4: Install the New Module Mount your new, pre-programmed TCM in place and tighten the bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Step 5: Finalize the Job Reconnect the battery terminal. While our VIN programming handles the critical setup, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes after the installation is complete.
Verified Vehicle Compatibility
This T42 TCM is a direct fit 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 Express 3500 Van TCM, it also fits the following models. Please verify your specific model and year.
- Chevrolet: Express 1500/2500/3500 Van (06-14), Silverado 1500/2500 (07-13), Tahoe (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11)
- GMC: Savana 1500/2500/3500 Van (06-14), Sierra 1500/2500 (07-13), Yukon (07-09), Envoy (06-09)
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09)
- Cadillac: DTS (06-11)
- Pontiac: G6 (06-10), Grand Prix (06-08)
- Hummer: H3 (08-10)
- And many more. This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24240449, and others.
Do I need to have this TCM programmed by a dealer?
Do I need to have this TCM programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for plug-and-play installation, saving you hundreds in dealership fees.
What is the warranty on this part?
This transmission control module is backed by our standard one-year warranty, covering any defects in materials or workmanship for your peace of mind.
Is there a core charge for my old TCM?
No, there is no core charge required for this part. You can keep your old module or dispose of it without the hassle of returning it.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, you should ensure other issues (like solenoids or wiring) have been ruled out. In the majority of cases I’ve seen, replacing the TCM resolves the P0700 and any related codes.