Restore Flawless Shifting to Your GMC Canyon
If you’re dealing with the frustration of a transmission that won’t shift correctly, gets stuck in gear, or triggers warning lights on your 2008-2012 GMC Canyon, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a reliable truck feel unpredictable. This OEM-quality T42 TCM, corresponding to part number 24239926, is the definitive solution, arriving pre-programmed to your truck’s VIN for a true plug-and-play repair.
A Technician’s Notebook: The Intermittent Shifting Mystery
A customer brought in his 2010 GMC Canyon complaining of intermittent, harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), but only after driving for 30+ minutes. The check engine light was on with a P0756 (Shift Solenoid ‘B’ Performance) code. We checked the fluid, wiring, and even the solenoid itself, but everything looked fine. From experience, I know these T42 modules, located in the hot engine bay (RH rear on the Canyon), can fail from heat soak. We swapped in a VIN-programmed module, and the problem vanished instantly. The original TCM’s internal circuits were breaking down when they got hot, a classic failure I’ve diagnosed hundreds of times.
Is Your GMC Canyon Exhibiting These Transmission Problems?
A failing TCM doesn’t get better on its own. It’s the brain of your automatic transmission, and when it malfunctions, you’ll notice. Check if any of these symptoms sound familiar:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored, especially P0700, P0751, P0756, or other solenoid-related faults.
- ✔ Complete loss of shifting capability or refusal to go into gear.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. You don’t need specialized tools or a trip to the dealership. The entire process should take less than 30 minutes.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On your 2008-2012 Canyon, the TCM is typically found in the engine compartment on the right-hand (passenger) side, towards the rear.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount your new, VIN-programmed module in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory. Start the truck and enjoy smooth shifting!
Verified Vehicle Compatibility
This module is a direct-fit replacement for the specified GMC Canyon and is also compatible with a wide range of other GM vehicles. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24239926, and more.
Primary Fitment:
- GMC CANYON: 2008, 2009, 2010, 2011, 2012 (Transmission; RH rear engine compartment)
- CHEVROLET COLORADO: 2008, 2009, 2010, 2011, 2012 (Transmission; RH rear engine compartment)
- HUMMER H3: 2008, 2009, 2010 (Transmission; RH rear engine compartment)
This part also fits many other GM cars, trucks, and SUVs from 2006-2014, such as the Silverado, Tahoe, Yukon, Savana, Impala, and more. Please verify your part number to ensure compatibility.
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your truck’s engine computer and other systems right out of the box, eliminating the need for an expensive programming service at a dealership.
Do I need to send my old part back?
No, there is absolutely no core charge or need to return your old module. You can dispose of it or keep it without any hassle.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. This module often resolves the underlying transmission issue that caused the P0700, but you should always diagnose the specific codes (like P0751, P0756, etc.) that are present alongside it.
Is this a reliable, long-term fix?
Absolutely. This module is built to meet or exceed OEM specifications for performance and durability. It comes with a one-year warranty, giving you confidence that you’re making a lasting repair for your Canyon.