If your 2006-2014 Chevrolet Express 3500 work van is experiencing harsh shifting, getting stuck in gear, or throwing transmission codes, you know that every minute of downtime costs you money. A faulty Transmission Control Module (TCM) is often the culprit, acting like a confused traffic cop for your transmission. This OEM-quality T42 TCM, part number 24252114, is the definitive solution to restore crisp, reliable shifting and get your van back on the job.
As a technician with over two decades of experience, I’ve seen firsthand how a failing TCM can sideline a perfectly good workhorse. The electronics inside these modules are susceptible to heat and vibration, especially in hardworking vehicles like the Express 3500. This leads to the frustrating symptoms you’re likely facing. The best part about this module? It arrives at your door pre-programmed to your van’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership and the hours they charge for programming. It’s a true plug-and-play fix that puts you back in control.
Case Study: A Tricky Diagnosis
A local contractor brought his 2011 Express 3500 into my shop, complaining of intermittent ‘no-shift’ conditions and a check engine light. The van would sometimes refuse to shift out of 2nd gear, a classic limp mode symptom. His scanner showed a generic P0700 (Transmission Control System Malfunction) and a specific solenoid code. He had already replaced the solenoid with no luck. After checking the wiring harness, we identified the T42 TCM as the source of the problem. Instead of a costly dealer part and programming fee, we installed one of our VIN-programmed modules. The entire job took less than 30 minutes, the codes were cleared, and the van was back on the road making him money the same afternoon. This is the kind of efficient, reliable repair this part provides.
Is Your Express Van Showing These Telltale Signs?
- ✔ Check engine light is on with transmission-related Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid circuit faults.
- ✔ The transmission shifts harshly, slams into gear, or hesitates between shifts.
- ✔ Your van is stuck in a single gear (limp mode), usually 2nd or 3rd, and will not upshift or downshift.
- ✔ You’re experiencing a sudden drop in fuel economy or the transmission seems to be overheating.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
A Straightforward Guide to Installation
Replacing the 2006-2014 Express 3500 TCM is a job most DIYers or any professional can handle quickly. In the Express and Savana vans, the module is conveniently located.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: On the Express/Savana platform, the T42 TCM is typically found in the engine compartment on the right-hand (passenger) side, mounted near the core support.
- Disconnect and Remove: Carefully unclip the electrical connectors. Use a small flathead screwdriver if needed, but be gentle to avoid breaking the plastic tabs. 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 connectors. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While our VIN programming handles the critical software, it’s always best 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 Fitment for Your General Motors Vehicle
While this part is a direct-fit solution for the 2006-2014 Express 3500, it is also compatible with a wide range of other GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. It is a direct replacement for part numbers 24252114, 24234503, 24242391, and others. Please verify your vehicle in the list below.
Partial Fitment List:
- CHEVROLET EXPRESS 3500 VAN (2006-2014) – Transmission; (RH engine compartment)
- CHEVROLET SILVERADO 1500 / 2500 (2007-2013) – Transmission; (next to battery)
- GMC SAVANA 1500 / 2500 / 3500 VAN (2006-2014) – Transmission; (RH engine compartment)
- CHEVROLET TAHOE / SUBURBAN (2007-2009) – Transmission; (next to battery)
- GMC YUKON / YUKON XL (2007-2009) – Transmission; (next to battery)
- HUMMER H3 (2008-2010) – Transmission; (RH rear engine compartment)
- And many more GM models…
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. This module is delivered fully programmed to your vehicle’s VIN. The service eliminates the need for any additional dealership programming, saving you time and money. Just install it and you’re ready to go.
What information do you need to program the TCM?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) at checkout. This ensures we load the exact correct software for your van’s specific configuration and options.
Is this a reliable part for a work vehicle?
Absolutely. This module is built to meet or exceed OEM specifications for performance and durability. It’s designed to withstand the demanding conditions of a commercial vehicle, providing a long-term solution to transmission issues.
What is a T42 TCM?
The T42 is the specific hardware platform used by General Motors for the transmission control module in a wide range of vehicles from this era. It is the electronic ‘brain’ that controls all shifting, torque converter lockup, and pressure regulation functions within the automatic transmission.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the process for you.