Restore Your Truck’s Performance with a Pre-Programmed TCM
If your 2007-2013 GMC Sierra 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a loss of power, reliability, and fuel economy. As a mechanic with over two decades of experience under the hood, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring a perfectly good truck to a standstill. This isn’t just a part; it’s the brain of your automatic transmission, and when it falters, your whole driving experience suffers. This T42 TCM, part number 24240449, is the definitive solution, arriving pre-programmed to your truck’s VIN for a true plug-and-play fix.
Case Study: The Sierra Stuck in Limp Mode
A customer brought in his ’09 Sierra 1500, complaining it wouldn’t shift past 2nd gear—a classic limp mode symptom. The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a specific part, my experience with these GM trucks told me to check the source. After confirming the wiring harness was intact, we swapped in a VIN-programmed T42 module. The codes cleared, the truck shifted perfectly on the test drive, and the customer avoided a costly and unnecessary internal transmission repair. This is the most common failure I see for these symptoms.
Is Your Sierra Showing These Telltale Signs?
A faulty TCM doesn’t always mean total failure. It often starts with small, frustrating issues. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Hard, jerky, or erratic gear shifts that make driving uncomfortable.
- ✔ The truck refuses to shift, getting stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0751, or other solenoid-related faults are present.
- ✔ A noticeable drop in fuel efficiency as the transmission isn’t operating in the optimal gear.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
Your 30-Minute Path Back to Smooth Shifting
One of the best features of this module is that it eliminates the need for a trip to the dealership for programming. This is a repair you can confidently handle in your own driveway with basic tools. For the 2007-2013 Sierra 1500, the process is especially straightforward.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Sierra, the TCM is typically mounted right next to the battery in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket. There are usually just a few small bolts holding it in place.
- Install the New Module: Bolt the new, pre-programmed TCM into the same location. Securely reconnect the wiring harnesses, making sure they click into place.
- Final Steps: Reconnect the battery terminal. Start the truck and let it idle for a few minutes. If you have a basic scan tool, it’s a good practice to clear any stored codes. Take a test drive to confirm the smooth shifting has returned.
Verified Fitment For Your GM Truck & More
This T42 TCM is a direct replacement for part number 24240449 and other service numbers. While it is a perfect fit for the 2007-2013 Sierra 1500 Transmission Control Module, it is also compatible with a wide range of other GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Always verify your specific model and year, but key compatible vehicles include:
- ✔ GMC Sierra / Chevrolet Silverado (2007-2013)
- ✔ GMC Yukon / Chevrolet Tahoe / Suburban (2007-2009)
- ✔ GMC Savana / Chevrolet Express Vans (2006-2014)
- ✔ Chevrolet Colorado / GMC Canyon (2008-2012)
- ✔ Hummer H3 (2008-2010)
- ✔ And many other Buick, Cadillac, Pontiac, and Saturn models.
Frequently Asked Questions
Frequently Asked Questions
Do I really not need to go to the dealer for programming?
That’s correct. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you time and the typical $100-$200 dealership programming fee.
What is the warranty on this Sierra 1500 Transmission Control Module?
This part is backed by our one-year, hassle-free warranty. We stand by the quality of our electronics because we know how critical they are to your vehicle’s operation.
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 faulty TCM is the root cause, and replacing it will resolve the code and any accompanying specific codes (like for solenoids). However, you should always ensure the wiring and transmission itself are in good health.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a job that takes less than 30 minutes. The location next to the battery on the Sierra makes it one of the easiest TCMs to access.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it without the hassle of shipping it back to us.