If your 2006-2014 Chevrolet Express 2500 work van is suffering from transmission woes like harsh shifting, getting stuck in gear, or a persistent check engine light, you’re not just dealing with an annoyance—you’re losing time and money. As a technician with over two decades of experience, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can bring a dependable workhorse to a grinding halt. This T42 TCM, part number 24235754, is the reliable, straightforward solution to get your van back in service without the high cost and hassle of a dealership visit.
This isn’t just a replacement part; it’s a complete fix. We pre-program the module to your van’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems right out of the box. You can bypass the need for expensive scan tools or programming appointments, making this an ideal repair for both professional shop owners and savvy DIYers.
A Technician’s Notebook: The Limp Mode Express Van
A local contractor brought in his ’09 Express 2500, complaining it was stuck in what felt like third gear and wouldn’t shift. The check engine light was on, and his fuel economy had plummeted. He was worried he was looking at a full transmission rebuild. I pulled the codes and saw the classic P0700 (Transmission Control System Malfunction). After checking the wiring harness for damage, I pinpointed the T42 TCM as the culprit—a common failure point due to heat cycles and vibration. Instead of a multi-thousand-dollar rebuild, we installed one of these VIN-programmed modules. In under an hour, the van was shifting smoothly, the code was gone, and the customer was back on the job. It’s a textbook example of how the right part saves a massive headache.
Is Your Express Van Showing These Red Flags?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Inconsistent or no response from the transmission when shifting from Park to Drive or Reverse.
- ✔ Poor fuel mileage and a feeling of sluggish performance.
Your Solution: The 2006-2014 Express 2500 TCM
This module is engineered to OEM specifications to restore the performance and reliability you depend on. It directly controls shift points, torque converter clutch lockup, and line pressure, ensuring your transmission operates exactly as the manufacturer intended. By replacing your failing unit, you’re not just clearing a code; you’re protecting your transmission from the premature wear and tear that erratic performance can cause.
Get Your Van Back to Work: A Simple Installation Guide
You don’t need to be a master mechanic to install this part. The process is straightforward and can be completed in your own driveway in about 30 minutes.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the vehicle’s computer systems.
- Locate the Module: On the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. 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. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes from the system’s memory.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct-fit replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page is focused on the 2006-2014 Express 2500 TCM, it is also compatible with the following models. Please verify your part number (interchange numbers include 24234503, 24252114, 24235754, and more) for a perfect match.
- Chevrolet: Express/Savana 1500/2500/3500 (06-14), Silverado 1500/2500 (07-13), Tahoe (07-09), Suburban 1500 (07-08), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado (08-12), and more.
- GMC: Sierra 1500/2500 (07-13), Yukon/Yukon XL 1500 (07-09), Savana 1500/2500/3500 (06-14), Canyon (08-12), Envoy (06-09).
- Buick: LaCrosse (06-09), Lucerne (06-11), Rainier (06-07).
- Cadillac: DTS (06-11).
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10).
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07).
- Hummer: H3 (08-10).
- Saab: 9-7X (06-09).
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for plug-and-play installation, saving you hundreds of dollars in dealership fees.
What is the warranty on this part?
This transmission control module is backed by our one-year warranty, giving you peace of mind and confidence in your repair.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the root cause. Replacing it with this pre-programmed unit is a very common and effective solution for clearing this code and the underlying issue.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it locally without the hassle of shipping it back to us.