Restore Your Silverado’s Shifting Performance
Is your 2007-2013 Silverado 1500 letting you down with harsh shifting, getting stuck in gear, or throwing transmission codes? A faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating issues. As the electronic brain of your automatic transmission, the TCM dictates every shift, clutch pressure, and torque converter operation. When it fails, your truck’s reliability and drivability suffer. This OEM-quality T42 TCM, part number 24256960, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Misleading Solenoid Code
I had a 2011 Silverado 1500 come into the shop last month. The owner was frustrated because he’d already replaced two shift solenoids himself trying to fix a persistent P0752 (Shift Solenoid ‘A’ Stuck On) code and a nasty 2-3 gear bang-shift. The new solenoids didn’t change a thing. After a quick check of the wiring harness, I suspected the TCM. The internal drivers that control the solenoids often fail from years of heat and vibration. We installed one of our VIN-programmed modules, and the problem was solved instantly. It’s a classic case where the code points to a component, but the root cause is the controller itself. This is why a quality, correctly programmed Silverado 1500 Transmission Module is often the real fix.
Is Your Silverado Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ The truck is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the module.
Your 30-Minute Path to a Smooth-Shifting Truck
One of the best features of this module is its straightforward installation. You don’t need specialized tools or a trip to the dealership. For a typical 2007-2013 Silverado 1500, the process is simple and can be done in your own driveway.
- 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 your Silverado, the TCM is typically mounted on a bracket right next to the battery in the engine compartment.
- 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 VIN-programmed module into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- 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 good practice to clear any stored transmission codes. Take a test drive to confirm the smooth shifting performance.
Verified Fitment For These GM Vehicles
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E). While this page focuses on the Silverado 1500 Transmission Module, it is also compatible with the following models. Please verify the location note for your specific vehicle.
- Chevrolet Silverado 1500 Pickup (2007-2013): (new style ’07), next to battery, w/o hybrid
- Chevrolet Tahoe/Suburban/Avalanche (2007-2009): next to battery
- GMC Sierra 1500 Pickup (2007-2013): (new style ’07), next to battery, w/o hybrid
- GMC Yukon / Yukon XL (2007-2009): next to battery
- Chevrolet Express / GMC Savana Vans (2006-2014): RH engine compartment
- Cadillac DTS (2006-2011): RH front engine compartment
- Buick Lucerne / LaCrosse / Allure (2006-2011): LH engine compartment or under air cleaner
- Pontiac Grand Prix / G6 (2006-2010): Lower air cleaner housing or LH strut tower
- Hummer H3 (2008-2010): RH rear engine compartment
- And many other GM models from 2006-2014. See full list for details.
Why is VIN programming so important for this part?
Why is VIN programming so important for this part?
VIN programming loads your truck’s specific software and calibration files onto the module before it ships. This ensures the TCM communicates perfectly with your engine computer (ECM) and other systems, controlling shift points, line pressure, and torque converter lockup exactly as the factory intended. It makes the installation truly plug-and-play and avoids a mandatory, costly programming session at a GM dealership.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the ECM to turn on the Check Engine Light. It means the TCM has stored its own specific codes. If the root cause is an internal failure of the TCM, then replacing it with this module will resolve the P0700 and the underlying specific codes (like those for solenoids or pressure switches).
Is this a difficult part for a DIY mechanic to install?
Not at all. For a Silverado 1500, this is one of the easier electronic components to replace. It’s located in the engine bay with easy access, requiring only basic hand tools to unbolt the module and disconnect the wiring. The entire job typically takes less than 30 minutes.
What’s the difference between a TCM and an ECM?
The Engine Control Module (ECM) is the main computer for the engine, managing fuel, spark, and emissions. The Transmission Control Module (TCM) is a separate computer dedicated solely to managing the automatic transmission’s functions. They work together but are distinct units.
Do I need to return my old module?
No, there is no core charge for this part. You can keep your old module or dispose of it without the hassle of returning it for a refund.