Restore Flawless Shifting to Your GMC Sierra 1500
Is your 2007-2013 GMC Sierra 1500 struggling with harsh shifts, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I’ve seen these symptoms countless times. The culprit is often a failing Transmission Control Module (TCM). This replacement T42 TCM, part number 24235732, is the definitive solution to restore your truck’s performance and reliability. It’s not just a part; it’s peace of mind, pre-programmed to your truck’s specific VIN for a true plug-and-play fix that eliminates the need for an expensive trip to the dealership.
From the Diagnostic Bay: The “Phantom” Shifting Problem
A customer brought in his ’08 Sierra 1500, complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). He’d already replaced a shift solenoid with no luck. After connecting my scan tool, I saw the classic P0700 code, which is just a general fault request from the TCM. Digging deeper, there were no specific solenoid codes, just erratic data from the module itself. This is a tell-tale sign. The internal logic of the original TCM was failing, causing it to send incorrect commands. Installing a VIN-programmed 2007-2013 Sierra 1500 TCM solved the issue instantly. The pre-programming ensured it communicated perfectly with the ECU and other systems, a step many people miss, leading to repeat repairs.
Is Your Truck Showing These Symptoms?
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear, with limited power.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid circuit faults), or U-series communication codes.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
- ✔ The transmission refuses to upshift or downshift, regardless of speed or throttle input.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to replace this module. For the GMC Sierra, the process is simple and can be done in your driveway in under 30 minutes. This guide will walk you through replacing your 2007-2013 Sierra 1500 TCM.
- Safety First: Begin by disconnecting the negative terminal from your truck’s battery. This prevents any electrical shorts and helps reset the vehicle’s electronic systems.
- Locate the Module: On your Sierra 1500, the TCM is conveniently located in the engine bay, right next to the battery. You can’t miss it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our VIN programming handles the critical setup, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the truck and enjoy smooth shifting!
Guaranteed Fitment for Your GM Vehicle
This T42 TCM is a direct-fit replacement for your 2007-2013 Sierra 1500 TCM and is also compatible with a wide range of other General Motors cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct interchange for part numbers 24252114, 24234503, 24235732, and more. Please verify your vehicle in the list below.
- GMC Sierra 1500 Pickup (2007-2013): Located next to battery. (For 2007, fits new body style with smooth door skin).
- Chevrolet Silverado 1500 Pickup (2007-2013): Located next to battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Located next to battery.
- Chevrolet Avalanche / Suburban 1500 (2007-2008): Located next to battery.
- GMC Savana / Chevrolet Express Vans (2006-2014): Located in RH engine compartment.
- Cadillac DTS (2006-2011): Located in RH front engine compartment.
- …and many other GM models from 2006-2014.
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and hundreds of dollars in dealership fees.
Is this a difficult part to install myself?
Not at all. For most trucks like the Sierra and Silverado, it’s located next to the battery and requires only basic hand tools. The entire job typically takes less than 30 minutes.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not have a core charge on this item, so you can keep your old part without any hassle or extra cost.
Will this fix a P0700 check engine light code?
Yes, in many cases. The P0700 code is a general code indicating the TCM has detected a fault. If the TCM itself is the source of the problem, replacing it with this programmed unit will resolve the code and the underlying issue.
What kind of warranty is included?
This part is backed by our one-year, hassle-free warranty, giving you confidence in the quality and durability of your repair.