Is Your Express 1500 Van Shifting Erratically?
If your 2006-2014 Chevrolet Express 1500 is experiencing harsh shifting, getting stuck in gear, or showing a check engine light with transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a host of frustrating and potentially damaging issues, leaving your reliable work van feeling unpredictable and unsafe.
This genuine OEM-quality T42 Transmission Control Module, service part number 24256960, is the definitive solution. We take the guesswork and high cost out of the repair by programming the module to your van’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives at your door ready for a simple, plug-and-play installation, with no need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2011 Express 2500 work van come into the shop that was stuck in third gear—classic limp mode. The driver had already replaced two shift solenoids based on a generic code reader, but the problem persisted. After a quick scan with our professional tool, we saw communication errors with the TCM. Instead of throwing more parts at it, we identified the root cause: the original module had failed internally. Installing a VIN-programmed T42 TCM like this one had the van shifting perfectly in under 30 minutes, saving the owner from further costly misdiagnoses.
Key Signs You Need a New Express 1500 Transmission Module
A failing TCM doesn’t just degrade performance; it can lead to more severe transmission damage if ignored. If you’re noticing any of the following symptoms, it’s time to inspect your TCM:
- ✔ Harsh Shifting and Gear Slipping: Abrupt, jerky gear changes or a feeling that the transmission is slipping between gears.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with TCM failure include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (e.g., P0751, P0756).
- ✔ Poor Fuel Economy: Inefficient shifting patterns caused by the faulty module can lead to a sudden drop in your van’s MPG.
Plug-and-Play Solution, Programmed for Your Van
The biggest hurdle in replacing modern electronic modules is the need for vehicle-specific programming. We eliminate that step. Simply provide your VIN during checkout, and our technicians will flash the module with the latest GM software updates for your exact vehicle configuration. This ensures perfect communication between the engine and transmission, restoring original performance and shift patterns right out of the box.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is an interchangeable part for numerous service numbers, including 24252114, 24234503, 24230461, and 24256960. Restore the reliability your work depends on and get back on the road with confidence.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module is pre-programmed to your vehicle’s VIN before shipping. 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 Express van?
On the 2006-2014 Savana and Express vans, the Transmission Control Module is typically located in the engine compartment on the right-hand (passenger) side.
Is this a difficult part to install myself?
Installation is straightforward for someone with basic mechanical skills. It usually involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in its place. The entire process often 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 this module often resolves the root cause of a P0700, it’s essential to scan for other, more specific codes (like solenoid or sensor codes) to confirm the diagnosis. A failing TCM is a very common cause for this code.
What if I order the wrong part?
We guarantee fitment based on the VIN you provide. Our team verifies compatibility before programming and shipping to ensure you get the correct part the first time. If you have any concerns, our expert support team is here to help you verify fitment before you order.