If your 2007-2013 GMC Sierra 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by this exact issue. The TCM is the brain of your automatic transmission, and when it fails, it can make your reliable workhorse feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical failure that compromises your truck’s performance and your peace of mind.
We offer a dependable, direct-fit solution. This T42 Transmission Control Module, part number 24240449, is meticulously prepared and programmed to your truck’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, restoring the crisp, smooth shifting you expect from your Sierra.
Case Study: A Tricky Diagnosis
A customer brought in his ’08 Sierra 1500 with a frustrating problem. It would intermittently drop into ‘limp mode’ (stuck in 3rd gear) with a P0700 code, but only after driving for 20-30 minutes. We checked the fluid, solenoids, and wiring harness—all looked good. On a hunch, I monitored the TCM data stream on a long test drive. Right as the truck warmed up, the command signals from the TCM became erratic just before it faulted. The internal electronics of the original module were failing under heat. Swapping in a pre-programmed T42 module like this one solved the issue immediately. The heat-soak was the key, a classic symptom of a failing TCM I’ve seen hundreds of times.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2007-2013 Sierra 1500 TCM problems:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The truck is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inconsistent or no upshifting/downshifting.
- ✔ Poor fuel mileage and a feeling of sluggish performance.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. You don’t need specialized tools, and the entire process can be done in under 30 minutes. For most Sierra 1500 models in this year range, the TCM is located right next to the battery in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Find the TCM, which is typically a silver box with two large electrical connectors, mounted next to the battery.
- Disconnect and Remove: Carefully unplug the two wiring harness connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the two wiring harness connectors, ensuring they click and lock into position.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the system’s memory. Start the truck and enjoy restored shifting performance.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24240449 and interchanges with several other GM service numbers, including 24252114, 24234503, and 24240400. While it is a perfect fit for the 2007-2013 Sierra 1500 TCM, it also fits a wide range of other GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Please verify your specific model in the list below:
Partial Fitment List:
- GMC Sierra 1500 Pickup (2007-2013): Located next to battery.
- Chevrolet Silverado 1500 Pickup (2007-2013): Located next to battery.
- GMC/Chevrolet Savana/Express Vans (2006-2014): Located in RH engine compartment.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Located next to battery.
- Chevrolet Impala (2006-2011): Located under lower air cleaner housing.
- Pontiac G6 (2006-2010): Located on LH strut tower.
- …and many more GM models from 2006-2014.
Do I need to have this module programmed by a dealer?
Do I need to have this module programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before shipping. It arrives ready to install, saving you hundreds of dollars and the hassle of a dealership visit.
Is this a new or used part?
This is a high-quality, OEM-spec replacement part that has been expertly prepared and programmed for your vehicle. It is backed by our one-year warranty for your peace of mind.
What if I install it and still have problems?
While this module solves the most common transmission electronic faults, shifting issues can also be caused by mechanical problems, solenoids, or wiring. We recommend having a proper diagnosis performed if you are unsure. Our expert support team is also available to help you troubleshoot.
Is there a core charge for my old module?
No, there is no core charge. You are not required to send your old, faulty module back to us, making the process faster and more convenient for you.