Fix Your Truck’s Shifting Problems for Good
If you’re dealing with a 2007-2013 Chevrolet Silverado 1500 that’s shifting harshly, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by a faulty Transmission Control Module (TCM). This isn’t just an annoyance; it’s a critical failure that compromises your truck’s performance and reliability. This OEM-quality T42 TCM, part number 24239926, is the direct-fit, pre-programmed solution to restore the crisp, predictable shifting you depend on.
A Technician’s Notebook: The Intermittent Limp Mode Nightmare
A customer brought in his ’09 Silverado 1500 with a frustrating problem: it would randomly refuse to shift past 3rd gear, but only after it was fully warmed up. No check engine light at first, just a gutless feeling on the highway. After a few cycles, a P0700 (Transmission Control System Malfunction) would finally pop up. We checked the fluid, wiring, and solenoids—all fine. The culprit? The original TCM was failing internally under heat, causing intermittent communication loss. Replacing it with a pre-programmed T42 module like this one solved the issue instantly. It’s a common failure point I’ve diagnosed on dozens of these trucks.
Is Your Silverado Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are subtle at first. If you’re experiencing any of the following, your TCM is the likely cause. Addressing it now can prevent more costly damage down the road.
- âś” Harsh, slamming shifts or delayed gear engagement.
- âś” The truck is stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” Check Engine Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- âś” Failure to upshift or downshift correctly, leading to poor acceleration.
- âś” A noticeable drop in fuel economy or signs of the transmission overheating.
- âś” Unpredictable electrical behavior related to the transmission.
Your 30-Minute Path to Smooth Shifting
One of the best features of this module is that it’s designed for a straightforward installation. You don’t need a professional lift or specialized tools. For most 2007-2013 Silverado 1500 TCM replacements, the module is located right 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 Old TCM: On your Silverado, you’ll typically find the TCM mounted next to the battery in the engine compartment. It’s a silver box with a few 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 Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, making sure they click to confirm a solid connection.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the truck and allow it to idle for a few minutes. If you have a basic OBD2 scanner, it’s a good practice to clear any stored fault codes. Take a test drive to confirm the shifting is smooth and responsive.
Verified Fitment for Your GM Truck or SUV
This T42 TCM is a direct replacement for part number 24239926 and is interchangeable with many other GM service numbers, ensuring broad compatibility. While it’s a perfect fit for the 2007-2013 Silverado 1500, it also fits a wide range of other vehicles. Please verify your specific model and options below.
This part will fit these makes and models with these options:
- CHEVROLET SILVERADO 1500 PICKUP 07 (new style, smooth door skin), (next to battery)
- CHEVROLET SILVERADO 1500 PICKUP 08 (next to battery)
- CHEVROLET SILVERADO 1500 PICKUP 09-13 (next to battery), w/o hybrid option
- GMC SIERRA 1500 PICKUP 07 (new style, smooth door skin), (next to battery)
- GMC SIERRA 1500 PICKUP 08 (next to battery)
- GMC SIERRA 1500 PICKUP 09-13 (next to battery), w/o hybrid option
- CHEVROLET AVALANCHE 1500 07-08 (next to battery)
- CHEVROLET TAHOE 07-09 (next to battery)
- GMC YUKON 07-09 (next to battery)
- …and many other GM models from 2006-2014 including Express/Savana vans, HHR, Cobalt, G6, LaCrosse, and more. Refer to the full fitment list for details.
What does ‘VIN Programmed’ mean for me?
What does ‘VIN Programmed’ mean for me?
It means we flash the module with your vehicle’s specific Vehicle Identification Number (VIN) before we ship it. This ensures it has the correct software and shift strategies for your exact truck. You can install it right out of the box without needing an expensive trip to the dealership for programming. It’s a true plug-and-play solution.
Is this a difficult part for a DIYer to install?
Not at all. For the 2007-2013 Silverado 1500, the TCM is easily accessible in the engine bay, usually next to the battery. With basic hand tools, the swap takes less than 30 minutes. Our installation guide above walks you through the simple process.
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 the source of the failure, replacing it with this module will resolve the root cause and allow the code to be cleared permanently.
Do I need to send my old part back?
No. There is no core charge for this part. You can keep or dispose of your old module, making the repair process faster and more convenient for you.