Is Your Chevy Express Van’s Transmission Giving You Trouble?
As a business owner or a hardworking professional, you rely on your 2006-2014 Chevrolet Express 3500 Van every single day. When the transmission starts acting up—with harsh shifts, delayed engagement, or getting stuck in gear—it’s not just an inconvenience; it’s a threat to your livelihood. A faulty Transmission Control Module (TCM) is often the culprit, disrupting communication and causing unpredictable performance. This VIN-programmed T42 TCM, part number 24239926, is the direct-fit, reliable solution to get your workhorse back on the road without costly dealership programming.
From the Diagnostic Bay: A Common Express Van Scenario
I’ve seen countless Express and Savana work vans roll into my shop with the same complaint: “It slams into gear, and the check engine light is on.” The driver is frustrated because their van is unreliable. After a quick scan, I almost always find a P0700 (Transmission Control System Malfunction) code, often accompanied by solenoid-specific codes. The root cause is typically internal failure of the original TCM due to years of heat cycles and vibration. Replacing it with a generic module that needs dealer programming just adds time and expense. This pre-programmed module is the exact fix I use to provide a permanent, one-and-done repair.
Key Symptoms of a Failing GM T42 TCM
If your vehicle is exhibiting any of these behaviors, a failing TCM is the likely cause. Addressing it promptly can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Failure to upshift or downshift properly.
- ✔ Decreased fuel economy and potential for transmission overheating.
- ✔ Complete loss of communication with the module.
A Straightforward Guide to Installation
You can install this module yourself in under 30 minutes, saving you time and labor costs. For the 2006-2014 Express 3500 TCM, it’s located in the engine compartment for easy 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 Express/Savana vans, the TCM is typically mounted on the right-hand (passenger) side of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts holding the old module in place.
- Install the New Module: Mount the new TCM and securely tighten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Reconnect Battery: Reattach the negative battery terminal. Your new module is pre-programmed and ready to go. We recommend clearing any stored DTCs with a basic scan tool after installation.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, 4L70E, and 4L80E). While this is the correct module for the 2006-2014 Express 3500 Van, it also fits many other models. Please verify your part number or consult the list below.
Interchangeable Part Numbers: 24239926, 24242391, 24234503, 24252114, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.
Partial Fitment List:
- Chevrolet Express / GMC Savana 1500, 2500, 3500 (2006-2014)
- Chevrolet Silverado / GMC Sierra 1500, 2500 (2007-2013)
- Chevrolet Tahoe / GMC Yukon (2007-2009)
- Chevrolet Impala (2006-2011)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- …and many more GM cars, trucks, and SUVs.
What does “VIN Programmed” mean for me?
What does “VIN Programmed” mean for me?
It means the module arrives at your door ready for installation. We flash it with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software. This ensures it communicates perfectly with your van’s engine and other systems, eliminating the need for an expensive trip to the dealership for programming.
Do I need any special tools for this job?
No special tools are required. Basic hand tools, like a socket set to remove the mounting bolts and disconnect the battery, are all you need. The entire process is designed to be straightforward for both DIYers and professional technicians.
Will this fix my P0700 check engine light code?
Yes, in most cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it with this pre-programmed unit will resolve the issue and allow you to clear the code for good.
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. This saves you the hassle and cost of return shipping.