Restore Flawless Shifting to Your GM Truck
If your 2007 GMC Sierra 2500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem is often a faulty Transmission Control Module (TCM). As a technician with over 20 years of experience diagnosing these exact issues, I can tell you that a failing TCM can mimic a major transmission failure, causing unnecessary stress and diagnostic headaches. This T42 TCM, part number 24234274, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
This module is the electronic brain of your 4L80E, 4L60E, or other compatible 4-speed automatic transmission. It precisely controls shift points, torque converter clutch engagement, and line pressure. When it fails, communication breaks down, leading to the frustrating symptoms you’re likely experiencing. By replacing it with our VIN-programmed unit, you’re not just swapping a part; you’re restoring the factory-intended communication and performance, effectively sidestepping a costly trip to the dealership for programming.
Case Study: The Sierra That Dodged a Rebuild
A customer brought in his ’07 Sierra 2500 work truck. It was stuck in limp mode (3rd gear only) and had a P0700 code. Another shop had quoted him over $3,000 for a transmission rebuild. After a quick scan, I suspected the TCM. In my shop, I’ve seen hundreds of these T42 modules fail due to heat cycles and vibration. We installed one of our pre-programmed modules, cleared the codes, and had him back on the road in under an hour. The fix wasn’t a new transmission; it was this exact 2007 Sierra 2500 TCM. He saved thousands and was back to work the same day.
Is Your Truck Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ 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 is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent loss of communication with the module, causing erratic behavior.
DIY Installation: A Straightforward 30-Minute Fix
You don’t need to be a professional mechanic to install this part. The location of the 2007 Sierra 2500 TCM makes it one of the easier electronic components to access. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the 2007 Sierra 2500 (new body style), the TCM is typically located in the engine bay, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct-fit replacement for a wide range of GM cars, trucks, and SUVs. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24234274, and more. Please confirm your vehicle is on the list below:
Partial Fitment List:
- GMC Sierra 1500/2500/3500 (2007-2013)
- Chevrolet Silverado 1500/2500/3500 (2007-2013)
- Chevrolet Tahoe / GMC Yukon (2007-2009)
- Chevrolet Suburban / GMC Yukon XL (2007-2008)
- Chevrolet Express / GMC Savana Van (2006-2014)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- …and many more GM models from 2006-2014.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN at checkout, and the module will arrive ready for immediate installation, saving you time and money.
What is the warranty on this part?
This module comes with a one-year warranty, giving you peace of mind and confidence in your repair. We stand behind the quality and reliability of our electronic components.
Is there a core charge for my old TCM?
No, there is absolutely no core charge. You can keep your old part or dispose of it without the hassle of shipping it back to us.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM. While a faulty TCM is a very common cause for this code, it’s essential to check for other specific codes (like for solenoids or sensors) that may accompany it. In many cases, replacing a bad 2007 Sierra 2500 TCM will resolve the P0700 code.
Where is the TCM located on other vehicles?
Location varies by model. Common spots include next to the battery (trucks/SUVs), under the air cleaner box (sedans like Impala/LaCrosse), on the LH strut tower (Cobalt/G6), or on the RH side of the engine compartment (Express/Savana vans).