Is Your Express Van Shifting Erratically?
If your 2006-2014 Chevrolet Express 1500 is experiencing harsh shifting, getting stuck in gear, or throwing transmission-related check engine lights, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for controlling shift points, torque converter clutch engagement, and line pressure. When it fails, it can cause a cascade of performance issues that make your vehicle unreliable and unsafe to drive.
From the Diagnostic Bay
We had a 2011 Express 2500 work van come into the shop that was stuck in what the driver called ‘fail-safe’ mode. It wouldn’t shift out of 3rd gear, making it dangerously slow from a stop. The scanner pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). After checking the wiring and solenoids, which were fine, we identified the internal T42 module as the source of the fault. Instead of a costly trip to the dealer, we installed a VIN-programmed module just like this one. The van was shifting perfectly within an hour, and the customer was back on the road making deliveries the same day.
Symptoms of a Failing Express 1500 Transmission Module
A faulty TCM can manifest in several ways. Keep an eye out for these common warning signs, as addressing them promptly can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, slamming, or delayed gear engagement from Park to Drive or Reverse.
- ✔ Erratic or unpredictable upshifting and downshifting while driving.
- ✔ Vehicle entering “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Illuminated Check Engine Light or Transmission Warning Light on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0755, or other solenoid-specific codes.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission, resulting in a no-shift condition.
The Plug-and-Play Solution: VIN Programming Included
Don’t settle for a generic module that requires an expensive trip to the dealership for programming. This T42 Transmission Control Module comes expertly pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the latest GM software updates and is perfectly calibrated for your van’s engine, transmission (4L60E, 4L65E, 4L70E), and tire size. This process eliminates compatibility issues and allows for a straightforward, plug-and-play installation right out of the box. Simply provide your VIN at checkout, and we handle the rest.
Built to meet and exceed original equipment specifications, this module restores the precise electronic control your transmission needs for smooth, efficient operation. It is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24243901, and 24256960, making it a versatile solution for numerous GM trucks, vans, and SUVs from this era.
Installation Guide
Installing your new Express 1500 Transmission Module is a job most DIY mechanics can complete in under 30 minutes. On the 2006-2014 Savana and Express vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side. Always disconnect the vehicle’s battery before beginning the installation to prevent electrical damage and help reset the vehicle’s adaptive memory. After swapping the module, reconnect the battery and use a capable OBD2 scan tool to clear any stored diagnostic trouble codes. With no core charge, you can keep your old part without the hassle of returning it.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module is delivered to you pre-programmed using your vehicle’s VIN. This makes it a true plug-and-play part, saving you the time and expense of a dealership visit for software flashing.
Where is the TCM located on my 2012 Express 1500?
On most 2006-2014 Express and Savana vans, the Transmission Control Module is found in the engine bay, mounted on the right-hand (passenger) side. Always confirm the location before starting the replacement.
Will this part fix a P0700 check engine light code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you are experiencing shifting problems along with the P0700 code, replacing the TCM is the most probable fix.
Is this compatible with other GM vehicles besides the Express?
Yes, this T42 TCM is compatible with a vast range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E series. This includes models like the Silverado, Sierra, Tahoe, Yukon, Impala, and many more. Please check the fitment list to confirm for your specific vehicle.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.