Restore Your Tahoe’s Performance with a Pre-Programmed TCM

If you’re dealing with the frustration of a 2007-2009 Chevrolet Tahoe that shifts harshly, gets stuck in gear, or throws transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can make a reliable SUV feel unpredictable and unsafe. The TCM is the brain of your automatic transmission, and when it fails, the symptoms can range from annoying to debilitating. This T42 series TCM, part number 24240449, is the definitive solution to get your vehicle operating smoothly and reliably again, without an expensive trip to the dealership.

We solve the biggest headache of this repair by programming the module to your vehicle’s specific VIN before it ships. This means it arrives ready for a true plug-and-play installation. You can bypass the costly programming fees and lengthy service appointments. This is the same high-quality component designed to restore the precise shifting logic your 4L60E, 4L65E, or 4L70E transmission needs. Don’t let a bad module sideline your truck; get the right part, programmed correctly, and get back on the road with confidence.

Is Your Tahoe Showing These Warning Signs?

• ✔ Harsh, banging shifts or erratic gear changes.
• ✔ 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 on with codes like P0700, P0750, or other solenoid-related DTCs.
• ✔ Delayed engagement when shifting from Park to Drive or Reverse.
• ✔ Poor acceleration and a noticeable drop in fuel economy.
• ✔ Complete loss of communication with the transmission module.

Your 30-Minute Path to Smoother Shifting

Installing your new TCM is a straightforward job that most DIYers can handle with basic tools. The module is typically located in the engine bay next to the battery.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
2. Locate the Old TCM: On your 2007-2009 Tahoe, find the module mounted next to the battery. It will have several large electrical connectors.
3. Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that may need to be pressed or pulled. Once disconnected, unbolt the module from its mounting bracket.
4. Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
5. Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for any warning lights. A short drive will allow the system to confirm proper operation. While not always necessary, clearing any stored codes with a basic scan tool is good practice.

Verified Fitment for Your Vehicle

This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2007-2009 Tahoe TCM, it is also compatible with the following models. Please verify your specific location as noted.

• Chevrolet Tahoe (2007-2009): Located next to the battery.
• Chevrolet Silverado 1500 (2007-2013): Located next to the battery.
• GMC Yukon / Yukon XL 1500 (2007-2009): Located next to the battery.
• GMC Sierra 1500 (2007-2013): Located next to the battery.
• Chevrolet Avalanche 1500 (2007-2008): Located next to the battery.
• Cadillac DTS (2006-2011): Located in the RH front engine compartment.
• Chevrolet Impala (2006-2011): Located under the lower air cleaner housing.
• Hummer H3 (2008-2010): Located in the RH rear engine compartment.
• …and many other GM cars, trucks, and SUVs from 2006-2014. This part is interchangeable with service numbers 24252114, 24234503, 24240449, and more.