End Your Silverado’s Shifting Nightmares for Good
Is your 2007-2013 Silverado 1500 pickup giving you trouble? If you’re dealing with banging gears, a truck that won’t shift, or a stubborn check engine light, a faulty Transmission Control Module (TCM) is the likely culprit. As a technician with over two decades of experience under the hood, I’ve seen countless GM trucks sidelined by TCM failure. This isn’t just an annoyance; it’s a problem that affects your truck’s reliability and your safety on the road. This T42 series TCM, part number 24256960, is the definitive, hassle-free solution to restore the crisp, smooth shifting you depend on.
A Technician’s Notebook: The Case of the Ghostly Glitch
A customer brought in his ’09 Silverado 1500 with a classic complaint: intermittent, bone-jarring shifts and occasionally getting stuck in third gear. No rhyme or reason. He’d already replaced a shift solenoid with no luck. After hooking up my scan tool, I saw the dreaded P0700 code—a general transmission fault. Digging deeper, I noticed communication dropouts from the TCM. In my shop, I’ve diagnosed hundreds of these T42 module failures. The internal circuit boards can develop micro-fractures from years of heat cycles and vibration, causing exactly these kinds of unpredictable electrical gremlins. We swapped in a VIN-programmed module, and the truck was shifting perfectly within 30 minutes. It’s a common story, and this part is the reliable fix.
Is Your Truck Showing These Telltale Symptoms?
A failing TCM doesn’t heal itself; it only gets worse. If you’re experiencing any of the following, it’s time for a replacement. Ignoring these signs can lead to permanent transmission damage.
- âś” Harsh, slamming shifts or delayed gear engagement.
- âś” Vehicle stuck in “limp mode” (usually 2nd or 3rd gear) with reduced power.
- âś” Check Engine Light or Transmission Warning Light is on.
- âś” Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750-P0758 (solenoid circuit faults), or U-series communication codes.
- âś” Failure to upshift or downshift, leading to poor acceleration and terrible fuel mileage.
- âś” The gear selector indicator on the dash may be blank or incorrect.
The Critical Advantage: Pre-Programmed for Your Silverado
The biggest headache with replacing electronic modules used to be the mandatory, expensive trip to the dealership for programming. We eliminate that step entirely. When you order, we flash this 2007-2013 Silverado 1500 TCM with your truck’s specific Vehicle Identification Number (VIN) and the latest GM software. This ensures it communicates flawlessly with your vehicle’s Powertrain Control Module (PCM) and other systems right out of the box. No special tools, no dealer appointments, no extra fees. It’s a true plug-and-play repair that saves you time and money.
A Straightforward Guide to Installation
Even if you’re a weekend warrior, you can handle this job in your own driveway in under an hour. For the 2007-2013 Silverado, the TCM is conveniently located 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: On your Silverado, the TCM is typically mounted right next to the battery. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. They have locking tabs, so don’t force them. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the truck and let it idle for a few minutes. While not always necessary, using a basic OBD2 scan tool to clear any old fault codes is a good final step.
Will This Fit My Vehicle?
This module is a direct replacement for part number 24256960 and other interchangeable numbers. It is guaranteed to fit the following vehicles, among many others:
- Chevrolet Silverado 1500 Pickup (2007-2013): Located next to the battery. (Note: 2007 models must be ‘new style’ with smooth door skin).
- Chevrolet Tahoe / Suburban 1500 (2007-2009): Found next to the battery.
- GMC Sierra 1500 Pickup (2007-2013): Located next to the battery. (Note: 2007 models must be ‘new style’ with smooth door skin).
- GMC Yukon / Yukon XL 1500 (2007-2009): Found next to the battery.
- Chevrolet Avalanche 1500 (2007-2008): Located next to the battery.
- Cadillac DTS (2006-2011)
- Chevrolet Impala (2006-2011)
- GMC Savana / Chevrolet Express Vans (2006-2014)
- Hummer H3 (2008-2010)
Do I need to have this module programmed by a dealer?
Do I need to have this module programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s VIN before shipping it. It arrives ready for immediate installation, saving you a trip to the dealership and their programming fees.
Is this compatible with my 4L60E or 4L70E transmission?
Yes, this T42 TCM is the correct controller for GM vehicles equipped with the 4L60E, 4L65E, and 4L70E 4-speed automatic transmissions within the specified model years.
What is a core charge? Do I need to send my old part back?
There is absolutely no core charge on this part. You are not required to return your old, faulty module to us. You can keep it or dispose of it at your convenience.
What kind of warranty is included?
We stand behind our parts with a one-year, hassle-free warranty. This module is built to meet or exceed OEM specifications for long-lasting reliability, whether you use your truck for daily driving or heavy-duty work.