If your 2006-2014 Chevrolet Express 1500 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 costly downtime. As a technician with over two decades of experience, I’ve seen countless work vans sidelined by a faulty Transmission Control Module (TCM). The TCM is the brain of your automatic transmission, and when it fails, it can mimic a major mechanical problem, leading to expensive misdiagnoses. This T42 TCM, part number 24243921, is the direct, reliable solution to get your van back on the road and working as hard as you do.
This isn’t just a replacement part; it’s a complete solution. We pre-program each module to your van’s specific Vehicle Identification Number (VIN) before it ships. This means you can skip the expensive trip to the dealership for programming. It arrives ready for a true plug-and-play installation, restoring the precise shift logic and communication your 4L60E or 4L65E transmission needs to operate smoothly and efficiently.
Case Study: The ‘Slipping’ Work Van
A local contractor brought in his 2011 Express 1500, convinced the transmission was shot. It was slamming into gear and occasionally wouldn’t shift past 2nd. Another shop had quoted him over $3,000 for a transmission rebuild. I hooked up my scan tool and saw the classic P0700 general fault code, along with a few intermittent solenoid circuit codes. Instead of condemning the transmission, I checked the TCM. After seeing no external damage, we swapped in a VIN-programmed T42 module. The total repair time was under 25 minutes. The codes cleared, the van shifted perfectly, and the owner saved thousands. It’s a textbook example of why you should always suspect the TCM first with these symptoms.
Is Your Express Van Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” Vehicle is stuck in “limp mode” (usually second or third gear).
- âś” The Check Engine Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- âś” Failure to upshift or downshift, leading to poor acceleration and performance.
- âś” A noticeable decrease in fuel economy.
- âś” Complete loss of communication with the transmission.
A Straightforward Guide to Your 2006-2014 Express 1500 TCM Installation
You don’t need to be a master mechanic to install this part. The job is simple and typically takes less than half an hour with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On 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. Press the release tabs firmly. Then, unbolt the old TCM from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed module in place and tighten the bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the van and test drive to confirm smooth shifting.
Verified Compatibility for GM Vehicles
This T42 TCM is a direct replacement for part number 24243921 and other service numbers. It is engineered for a wide range of 2006-2014 General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. While this page focuses on the Express 1500, this module also fits:
- âś” Chevrolet Silverado, Tahoe, Suburban, Impala, Cobalt, HHR
- âś” GMC Sierra, Yukon, Savana
- âś” Cadillac DTS, Buick LaCrosse, Lucerne
- âś” Pontiac G6, Grand Prix, and many others.
This module is interchangeable with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24252114, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.
Frequently Asked Questions
Do I need to take this TCM to the dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
Where is the TCM located on my 2006-2014 Express Van?
On the Chevrolet Express and GMC Savana vans from this era, the Transmission Control Module is located in the engine bay, on the right-hand (passenger) side.
Will this fix a P0700 trouble code?
Yes, very often. P0700 is a generic code indicating the TCM has detected a fault. Replacing a failing TCM is a common and effective way to resolve this code and the underlying specific codes it has stored.
What tools do I need for installation?
Installation requires only basic hand tools, typically a simple socket set to remove the mounting bolts and a flathead screwdriver to help with the connector tabs if they are stubborn.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it at your convenience without the hassle of returning it.
How does the VIN programming work?
During checkout, you will provide your vehicle’s 17-digit VIN. Our technicians use this number to load the latest GM-certified software and specific calibration files for your van’s exact configuration, ensuring perfect compatibility.