Restore Your Van’s Shifting Performance and Reliability
If your 2006-2014 Chevrolet Express 1500 Van is suffering from erratic shifting, getting stuck in gear, or has a transmission warning light on, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good work van. This isn’t just an annoyance; it’s a reliability issue that costs you time and money. This T42 TCM, part number 24243901, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook
I remember a fleet customer with a 2011 Express 1500 that was intermittently dropping into limp mode (stuck in 3rd gear), especially on hot days after long drives. He’d already replaced a shift solenoid with no luck. After connecting my scan tool, I saw a generic P0700 code but also intermittent communication loss with the TCM. On these vans, the TCM is mounted in the right-hand side of the engine compartment, where it’s constantly exposed to heat cycles. Over years of service, this heat degrades the internal circuits. We swapped in a VIN-programmed module, and the problem was solved instantly. It’s a classic failure mode for these hard-working vehicles, and this part is the correct fix.
Is Your Express Van Showing These Warning Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” usually second or third gear, with limited power.
- ✔ Your Check Engine Light or a dedicated transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 (Transmission Control System Malfunction) or specific solenoid codes (e.g., P0751, P0756).
- ✔ The transmission refuses to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Complete loss of communication with the module, preventing diagnostics.
The Smart Fix: Why a Programmed Module is Essential
The real value of this module is the VIN programming we do before it ships. In the past, replacing a TCM meant installing the part and then towing the vehicle to a dealership for an expensive programming session. Our process eliminates that step entirely. We flash the module with the latest GM software specific to your 2006-2014 Express 1500 TCM, ensuring it communicates perfectly with your van’s engine controller and other systems right out of the box. This restores precise shift points, proper torque converter lockup, and accurate diagnostic reporting, safeguarding your transmission from further damage caused by incorrect commands.
Your 30-Minute Path to a Smooth-Shifting Van
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the TCM: On your Express Van, the TCM is located in the engine compartment on the right-hand (passenger) side.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab orientation to make reconnection easy. 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 good practice to use a basic OBD2 scanner to clear any old fault codes stored in other systems. Start the vehicle and enjoy restored performance.
Verified Compatibility for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24243901 and other service numbers. While this page is focused on the Express Van, it is also compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E, 4L80E). Please verify your part number or contact us with your VIN to ensure perfect fitment.
Fits:
- Chevrolet Express 1500/2500/3500 Van (2006-2014)
- Chevrolet Silverado, Tahoe, Suburban, Avalanche (2007-2013)
- GMC Sierra, Yukon, Savana Van (2007-2014)
- Cadillac DTS, Escalade
- Hummer H3
- And many more Buick, Pontiac, and Saturn models.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This is the biggest benefit of our service. We program the module to your vehicle’s VIN before shipping, so it’s ready for immediate installation without any extra steps or costs.
Is this installation difficult for a DIYer?
Not at all. If you can disconnect a battery and use a basic wrench, you can replace this module. It’s located in an accessible spot in the engine bay and typically takes less than 30 minutes to swap.
What is a core charge?
There is no core charge for this part. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating a fault was detected in the transmission control system. In many cases, a failing TCM is the root cause. Replacing the module often resolves the P0700 and any related specific codes.
What transmission does this work with?
This T42 TCM is designed for vehicles with the popular GM 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E.