Is Your Van’s Transmission Acting Up?
If your 2006-2014 Chevrolet Express 2500 is suffering from harsh shifting, delayed gear engagement, or has the dreaded check engine light illuminated with transmission-related codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a cascade of problems that mimic catastrophic transmission failure, leading to costly misdiagnoses. This genuine quality T42 TCM, service number 24239926, is the definitive solution to restore your vehicle’s performance and reliability.
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 was convinced the 4L80E transmission was shot and was bracing for a multi-thousand dollar bill. After pulling the codes, we saw a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of immediately quoting a new transmission, we checked the TCM. After swapping in a VIN-programmed module like this one, all the codes cleared, and the van shifted perfectly. A 30-minute fix saved the owner a massive headache and a huge expense. Never underestimate the importance of the TCM.
Symptoms of a Failing T42 TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear, with limited power.
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ The transmission may seem to slip between gears or fail to engage from Park to Drive or Reverse.
- ✔ Unexplained electrical issues that seem to be related to the transmission’s operation.
Why Choose Our Programmed 2006-2014 Express 2500 TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest challenge when replacing a modern electronic module is programming. Our service eliminates that obstacle entirely. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the TCM has the latest GM software and is perfectly calibrated for your van’s specific configuration. The result is a true plug-and-play installation that requires no expensive trips to the dealership for programming. Simply install the module, clear any old codes, and get back on the road.
Built to meet and exceed original equipment standards, this T42 TCM provides a dependable and long-lasting repair for your workhorse van. It’s a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, and many more, making it a versatile solution for numerous GM trucks, vans, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 Transmission Control Module (TCM) is a small computer that acts as the central command for your vehicle’s automatic transmission. It reads data from various sensors (like vehicle speed and engine RPM) to control shift solenoids, manage torque converter lockup, and regulate fluid pressure for smooth and precise gear changes.
Is this module truly plug-and-play?
Yes. Because we program the module to your vehicle’s VIN before shipping, it arrives ready for installation. You will not need any special tools or a trip to the dealership for additional programming. It’s designed to be a straightforward DIY or mechanic-friendly repair.
Where is the TCM located on my Express 2500?
On the 2006-2014 Chevrolet Express and GMC Savana vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side. Always disconnect the vehicle’s battery before starting the replacement process.
Will this fix specific error codes like P0700?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, a faulty TCM is the root cause. Replacing a failing module with this pre-programmed unit will resolve the underlying issue that triggers P0700 and related solenoid codes, clearing the check engine light after installation and a code reset.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle, simplifying the repair process for you.