If your 2007-2013 GMC Sierra 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is often not the transmission itself, but its electronic brain: the Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless truck owners worry about a costly transmission rebuild when a simple, direct-replacement TCM was the real solution. This T42 Transmission Control Module, corresponding to part number 24239224, is the definitive fix for those frustrating and often misdiagnosed powertrain issues.
This isn’t just a part in a box. We pre-program it to your truck’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures it communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming. For a busy mechanic, that means faster turnaround times in the bay. For the DIYer, it means a weekend project that saves you hundreds of dollars and gets your reliable truck back on the road where it belongs.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Sierra 1500 with a classic complaint: it would randomly refuse to shift out of 3rd gear (limp mode) and had a P0700 code. Another shop had quoted him over $3,000 for a transmission overhaul, suspecting internal clutch failure. After hooking up my scan tool, I noticed erratic voltage readings from the shift solenoids. Instead of tearing down the transmission, I inspected the TCM. Sure enough, there were signs of internal circuit failure, a common issue in these T42 modules after years of heat cycles. We installed a VIN-programmed 2007-2013 Sierra 1500 TCM, cleared the codes, and the truck shifted perfectly. The customer saved thousands and was back to work the next day. Never underestimate the electronics.
Is Your Sierra’s Transmission Acting Up?
A failing TCM can mimic a major mechanical failure. Before you condemn your transmission, check if your truck is exhibiting these common symptoms. Replacing the 2007-2013 Sierra 1500 TCM is often the solution.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The truck is stuck in “limp mode,” usually in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid codes), or other communication errors.
- ✔ Poor acceleration and a sudden drop in fuel economy.
- ✔ The transmission seems to slip between gears or fails to downshift properly.
Your 30-Minute Path to a Smooth-Shifting Sierra
Installation is a straightforward process that most DIYers can complete in their driveway. For the 2007-2013 Sierra 1500, the TCM is conveniently located right next to the battery in the engine compartment.
- 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: Open the hood and find the TCM mounted next to the battery tray on the driver’s side.
- Disconnect and Remove: Carefully unclip the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While our VIN programming handles the critical setup, it’s 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 smooth, reliable shifting.
Verified Fitment for Your General Motors Vehicle
While this is the primary solution for the 2007-2013 Sierra 1500 TCM, this versatile T42 module is also a direct replacement for a wide range of GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Please verify your part number (interchangeable numbers include 24252114, 24234503, 24239224, and others) or use the fitment list below.
- GMC Sierra 1500 Pickup (2007-2013): Located next to the battery.
- Chevrolet Silverado 1500 Pickup (2007-2013): Located next to the battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Located next to the battery.
- Chevrolet Avalanche 1500 (2007-2008): Located next to the battery.
- GMC Savana / Chevrolet Express Vans (2006-2014): Located in the RH engine compartment.
- Hummer H3 (2008-2010): Located in the RH rear engine compartment.
- …and many other GM models from 2006-2014. See the full list for details.
Do I need to take this part to a dealer for programming?
Do I need to take this part to a dealer for programming?
No. We handle all the programming before we ship it to you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for plug-and-play installation, saving you time and money.
Will this fix a P0700 check engine light code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is faulty, replacing it with this pre-programmed unit will resolve the root cause and allow the code to be cleared.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of shipping it back to us.
How do I know if I need a TCM or a new transmission?
While symptoms can overlap, TCM failure is typically electronic in nature (erratic behavior, specific codes like P0700, solenoid faults). A major mechanical failure might involve loud grinding noises, a complete loss of movement, or burnt, dark transmission fluid. A proper diagnosis with a scan tool is the best way to be certain, but a faulty TCM is a very common and less expensive starting point for these symptoms.