If your 2006-2014 Chevrolet Express 1500 Van is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re dealing with costly downtime. As a technician with over two decades of experience, I know that a faulty Transmission Control Module (TCM) is one of the most common culprits behind these issues on the GM 4L60E and 4L80E transmissions. This T42 TCM, part number 24241806, is the definitive, reliable solution to get your workhorse van back in service without a trip to the dealership.
A Technician’s Notebook: The Case of the Limp-Mode Express
A local contractor brought in his 2011 Express 1500, complaining it was stuck in what felt like third gear and the check engine light was on. His scanner showed a P0700 (Transmission Control System Malfunction) and a handful of solenoid codes. He was worried he needed a full transmission rebuild, which would put his van out of commission for days. In my shop, I’ve seen this exact scenario hundreds of times. Before condemning thousands of dollars in hard parts, the first thing we check is the TCM. These T42 modules are known to fail internally, causing erratic signals to the solenoids. We swapped in a VIN-programmed module, cleared the codes, and the van was shifting perfectly within the hour. He was back on the job the same day, having avoided a massive repair bill and lost income.
Is Your Work Van Showing These Red Flags?
A failing TCM doesn’t just get worse over time; it can cause permanent damage to your transmission. If you’re experiencing any of the following, it’s time to address the problem:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of a single gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A sudden drop in fuel economy or signs of the transmission overheating.
- ✔ Intermittent electrical issues that seem to affect the transmission’s performance.
Why Our Programmed Express 1500 Van TCM is the Smart Fix
This isn’t just a replacement part; it’s a complete solution designed for reliability and ease of use. We take the guesswork and extra steps out of the repair process.
- ✔ Plug-and-Play Installation: Each module is pre-programmed to your van’s specific Vehicle Identification Number (VIN). This ensures it communicates perfectly with your vehicle’s computer systems right out of the box. No expensive dealer programming or special tools are required.
- ✔ Restored Performance: By precisely managing shift points, torque converter lockup, and line pressure, this module restores the smooth, efficient operation you depend on. It corrects the root cause of many common transmission faults.
- ✔ OEM-Standard Quality: Built to meet or exceed original equipment specifications and backed by a one-year warranty, you can trust this module to withstand the demands of daily work and heavy loads.
- ✔ No Core Charge: We don’t require you to send back your old, faulty part. This saves you the time, hassle, and expense of dealing with core returns.
A Straightforward Guide to Installation
For the Chevrolet Express and GMC Savana vans, this is a very accessible DIY job that can be completed in under 30 minutes with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the Module: On your Express 1500 Van, the TCM is typically located in the engine compartment on the right-hand (passenger) side, often mounted near the battery or firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, pre-programmed TCM in the same location and securely fasten it. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD-II scan tool to clear any stored transmission codes after the installation is complete.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24241806 and other service numbers. While it fits a wide range of GM vehicles, it is confirmed for the following models (check your specific location as noted):
- CHEVROLET EXPRESS 1500 / 2500 / 3500 VAN (2006-2014): Transmission; (RH engine compartment)
- GMC SAVANA 1500 / 2500 / 3500 VAN (2006-2014): Transmission; (RH engine compartment)
- CHEVROLET SILVERADO & GMC SIERRA (2007-2013): Transmission; (next to battery)
- CHEVROLET TAHOE & GMC YUKON (2007-2009): Transmission; (next to battery)
- CHEVROLET IMPALA (2006-2011): Transmission; (lower air cleaner housing)
- …and many other Buick, Cadillac, Pontiac, Saturn, Hummer, and Saab models as listed in the fitment data.
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. The main benefit of our service is that the module comes pre-programmed to your VIN. This eliminates the need for dealership programming, saving you time and money. It is a true plug-and-play solution.
How does the VIN programming work?
During checkout, you will provide us with your vehicle’s 17-digit VIN. We use this information to load the latest GM-approved software and calibrations specific to your Express Van’s configuration, ensuring perfect compatibility.
Will this fix my transmission codes like P0700?
Yes. If the TCM itself is the source of the fault, replacing it with this programmed module will resolve the codes. A P0700 is a general code indicating the TCM has detected a problem. This part often fixes the underlying issue causing that code and related solenoid faults.
What is the warranty on this part?
This Transmission Control Module comes with a one-year replacement warranty, giving you peace of mind and confidence in your repair.
Is this a new or used part?
This is a high-quality, tested component built to OEM standards. It’s guaranteed to restore function and is backed by our warranty, providing a reliable and cost-effective alternative to a new dealer part.