Get Your Workhorse Back on the Job with a Reliable Transmission Solution
If your 2006-2014 Chevrolet Express 3500 Van is suffering from unpredictable shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty T42 module can bring your operations to a halt. This isn’t just an inconvenience; it’s a hit to your productivity and safety. This replacement module, part number 24239224, is the definitive solution to restore the crisp, reliable shifting your work van needs to perform day in and day out.
We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your van’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives ready for a true plug-and-play installation, loaded with the latest GM software updates to ensure perfect communication with your vehicle’s systems and optimal transmission performance from the moment you install it.
From the Diagnostic Bay: The Case of the Limp-Mode Express Van
A local contractor brought in his 2011 Express 3500, complaining it was stuck in what felt like third gear—a classic case of limp mode. His check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). He was worried about a costly transmission rebuild. In my 20+ years, I’ve seen this exact scenario countless times. The 4L80E transmission in these vans is robust, but the T42 TCM is a known weak point due to heat cycles and vibration. We swapped in a VIN-programmed module, cleared the codes, and had his van shifting perfectly in under an hour, saving him thousands and getting his business back on the road.
Is Your Express Van Showing These Red Flags?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time to diagnose the module. Addressing it now can prevent more severe, and expensive, mechanical damage to your transmission.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ Check Engine Light is illuminated with transmission-related Diagnostic Trouble Codes (DTCs), such as P0700, P0750-P0758, or other solenoid circuit faults.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission seems to slip out of gear unexpectedly.
- ✔ No communication with the TCM when using a diagnostic scan tool.
A Straightforward Guide to Installation
Replacing the 2006-2014 Express 3500 TCM is a job most DIYers or any professional mechanic can complete quickly. No specialized tools are required, and since it comes pre-programmed, there’s no need for a trip to the dealership.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the Module: In the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab locations to avoid damage. Then, unbolt the 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 always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the Express 3500, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Chevrolet Express / GMC Savana (1500, 2500, 3500): 2006-2014 (RH engine compartment)
- Chevrolet Silverado / GMC Sierra (1500, 2500): 2007-2013 (next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (next to battery)
- Chevrolet Colorado / GMC Canyon: 2008-2012 (RH rear engine compartment)
- Chevrolet Impala: 2006-2011 (lower air cleaner housing)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- And many more GM models from Buick, Pontiac, Saturn, and Saab. Refer to the full fitment data.
Do I need to have this TCM programmed by a dealer?
Do I need to have this TCM programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before shipping. This makes the installation plug-and-play, saving you the time and expense of a dealership visit.
What does a Transmission Control Module (TCM) do?
The TCM is a computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and transmission to control shift points, line pressure, and torque converter lockup for smooth and efficient operation.
Is this part difficult to install on my 2006-2014 Express 3500 Van?
Not at all. For the Express van, it’s one of the easier electronic module replacements. It’s located in the engine bay and is accessible with basic hand tools. The entire process typically takes less than 30 minutes.
Will this fix a P0700 check engine light code?
A P0700 code is a generic fault request from the TCM to the main engine computer (ECU) to turn on the check engine light. A failing TCM is a very common cause of this code. Replacing the module will often resolve the P0700 and any other related transmission codes.
Is there a core charge for my old part?
No, we do not require a core charge. You can keep your old part, which simplifies the process and saves you the hassle and cost of return shipping.