If your 2006-2014 Chevrolet Express 3500 Van is suffering from unpredictable shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing downtime that costs you money. As the brain of your automatic transmission, a failing Transmission Control Module (TCM) can bring your workhorse to a halt. This T42 TCM, service part number 24240400, is the reliable, direct-fit solution to restore your vehicle’s performance and get you back on the job without a costly trip to the dealership.
This module comes pre-programmed to your van’s specific Vehicle Identification Number (VIN). This is a critical step that many overlook. Without correct programming, a new TCM won’t communicate properly with your vehicle’s other computers, leading to the same, if not worse, performance issues. We handle the programming for you, ensuring that when your part arrives, it’s ready for a true plug-and-play installation.
From the Diagnostic Bay
A few months back, a local contractor brought in his 2011 Express 3500. He was frustrated because the van would randomly refuse to shift out of 2nd gear, especially on hot days after multiple stops. The check engine light was on, and his scanner pulled a P0700 (Transmission Control System Malfunction). After checking the fluid and wiring, we suspected the TCM. In my shop, I’ve seen hundreds of these T42 modules fail due to heat cycles and vibration, causing internal circuit board cracks. We swapped in a VIN-programmed module, cleared the codes, and the van was shifting perfectly within the hour. It’s a common failure point, but thankfully, it’s a straightforward fix with the right part.
Is Your Express Van Showing These Red Flags?
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ The vehicle is stuck in “limp mode,” often in a single gear (like 2nd or 3rd).
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid circuit faults), or U-codes for communication loss.
- ✔️ A noticeable drop in fuel economy due to inefficient shifting.
- ✔️ Complete failure to shift, either up or down.
The Definitive Solution for Your 2006-2014 Express 3500 TCM
Replacing your faulty module with this pre-programmed unit restores the precise electronic control your transmission needs. It correctly manages shift points, torque converter lockup, and line pressure, which not only smooths out performance but can also extend the life of your transmission by preventing the mechanical stress caused by a faulty TCM. Built to meet or exceed OEM specifications, this part is backed by our one-year warranty for your peace of mind.
Simple Installation to Get Your Van Working Again
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- ✔ Locate the Module: On the Express/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. Use a socket wrench to remove the bolts holding the old TCM in place.
- ✔ Install the New Module: Mount the new TCM and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- ✔ Final Steps: Reconnect the battery terminal. While our programming resolves most issues, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes. Start the vehicle and test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
While this is a perfect fit for the 2006-2014 Express 3500 TCM, this versatile T42 module is also compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. It is a direct replacement for part numbers 24252114, 24234503, 24240400, and others. Please see the detailed list below:
- Chevrolet Express / GMC Savana (1500, 2500, 3500) 2006-2014
- Chevrolet Silverado / GMC Sierra (1500, 2500) 2007-2013
- Chevrolet Tahoe / GMC Yukon 2007-2009
- Cadillac DTS 2006-2011
- Buick Lucerne & LaCrosse 2006-2011
- Chevrolet Impala 2006-2011
- Hummer H3 2008-2010
- And many more models from Pontiac, Saturn, and Saab.
Frequently Asked Questions
What does “VIN Programmed” mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures it has the correct software and calibration for your specific engine, transmission, and options, allowing it to work perfectly right out of the box.
Do I need to take my van to a dealer after installation?
No. Our VIN programming service eliminates the need for any additional programming at a dealership or repair shop, saving you time and hundreds of dollars in labor fees.
Is this part difficult to install for a DIYer?
Not at all. If you have basic hand tools and can disconnect a battery, you can do this job. It’s typically located in an accessible spot in the engine bay and involves unplugging connectors and removing a few bolts. The entire process usually takes less than 30 minutes.
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, this code can also be triggered by other transmission issues. Replacing a known-bad TCM is the correct step to resolving the P0700 and any related specific codes (like for solenoids).
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, making the process hassle-free.