If your 2006-2014 Chevrolet Express 1500 Van is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing vehicle downtime that can cost you time and money. As a technician with over two decades of experience, I’ve seen countless work vans sidelined by a faulty Transmission Control Module (TCM). This isn’t just a part; it’s the brain of your automatic transmission, and when it fails, your van’s reliability is compromised. This T42 TCM, part number 24240400, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play fix.
Forget about expensive dealership visits and the hassle of programming a blank module. We handle the complex part for you. By programming this module with the latest GM software updates before it ships, we ensure it communicates flawlessly with your vehicle’s systems right out of the box. This restores precise control over shift points, torque converter lockup, and line pressure, eliminating the erratic behavior and getting your dependable workhorse back on the road where it belongs.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2011 Express 1500, complaining of intermittent ‘no-shift’ conditions and a check engine light. Some days it drove fine, others it would get stuck in 3rd gear (limp mode). His scanner showed a generic P0700 code. After checking the wiring harness and solenoids, which tested fine, we suspected the TCM. The intermittent nature of the fault is classic for these modules as internal circuits begin to fail under heat. We installed one of our pre-programmed T42 modules. The total time on the lift was less than an hour, and the van was back in service the same afternoon. The customer called a week later to say it had never shifted better—a simple part swap saved him from what he feared would be a costly transmission rebuild.
Is Your Express Van Showing These Telltale Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in limp mode, often in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Unexplained loss of fuel economy or a transmission that seems to be overheating.
- ✔ Complete failure to shift up or down.
A Straightforward Guide to Installation
For the Chevy Express and GMC Savana vans, this is a job most DIYers or any professional can handle in under 30 minutes. The location is consistent and easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On the 2006-2014 Express and Savana vans, you’ll find the TCM in the engine compartment, mounted on the right-hand side (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 Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical connectors. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While our programming resolves most codes, it’s good practice to use a scan tool to clear any stored DTCs from other modules. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module, part number 24240400, is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While it is a perfect fit for the 2006-2014 Express 1500 Transmission Control Module, it also interchanges with the following parts and fits these models:
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, YNXS, and more.
Fitment Includes:
- Chevrolet Express / GMC Savana 1500, 2500, 3500 (2006-2014)
- Chevrolet Silverado / GMC Sierra 1500, 2500 (2007-2013)
- Chevrolet Tahoe / GMC Yukon (2007-2009)
- Chevrolet Avalanche 1500 (2007-2008)
- Chevrolet Impala (2006-2011)
- Hummer H3 (2008-2010)
- And many more Buick, Cadillac, Pontiac, and Saturn models. Please verify your specific model in the fitment list.
Frequently Asked Questions
Do I need to do any programming or take this to a dealer?
No. This module is fully programmed to your vehicle’s VIN before shipping. It is a plug-and-play solution that requires no additional programming or dealer intervention.
Is this a reliable fix for my Express 1500 Transmission Control Module?
Absolutely. This module is built to meet or exceed OEM specifications and is tested for quality and durability. It directly addresses the common failure points of the original T42 TCMs, providing a long-term, dependable solution.
What tools do I need for the installation?
You’ll only need basic hand tools, typically a socket set to remove the mounting bolts and a wrench for the battery terminal. No special diagnostic equipment is required for the installation itself.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to return it, simplifying the repair process for you.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. This ensures we can program the module specifically for your van’s configuration.