Restore Crisp, Decisive Shifting to Your GMC Canyon
Is your 2008-2012 GMC Canyon suffering from frustrating transmission problems like harsh shifting, getting stuck in gear, or a persistent check engine light? As a technician with over two decades of experience, I’ve seen countless GM trucks sidelined by a faulty Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, and when it fails, it can cause a cascade of issues that make your truck unreliable. This T42 TCM, part number 24238856, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Canyon complaining of intermittent ‘limp mode’—it would get stuck in 3rd gear, but only after driving for 20+ minutes. There were no hard solenoid codes, just a generic P0700 (Transmission Control System Malfunction). After checking the wiring and fluid, my experience pointed straight to the TCM. Heat soak was causing internal connections to fail. We installed one of our VIN-programmed T42 modules, and the problem was solved in under an hour, saving the customer hundreds compared to a dealership visit for diagnostics and programming.
Is Your Canyon Exhibiting These Transmission Faults?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely fix for your 2008-2012 Canyon TCM issues:
- ✔ Unpredictable or jarring shifts between gears.
- ✔ The transmission refusing to shift up or down.
- ✔ Vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs), such as P0700, P0750, or other solenoid-specific codes.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
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. For the GMC Canyon, the TCM is typically found in the engine bay, making access easy.
- 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 the 2008-2012 Canyon, the TCM is located in the right-hand rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the previous failure. Start the truck and enjoy smooth shifting!
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2008-2012 Canyon TCM, it is also compatible with the following models. Always verify your part number (24238856) or contact us with your VIN.
- GMC Canyon: 2008-2012 (RH rear engine compartment)
- Chevrolet Colorado: 2008-2012 (RH rear engine compartment)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Chevrolet Silverado / GMC Sierra 1500/2500/3500: 2006-2013 (Varies, often next to battery)
- Chevrolet Tahoe / Suburban / GMC Yukon: 2007-2009 (Next to battery)
- Chevrolet Express / GMC Savana Vans: 2006-2014 (RH engine compartment)
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we flash the module with your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software before we ship it. This ensures it communicates perfectly with your truck’s other computers (like the ECM) right out of the box, eliminating the need for expensive dealership programming.
Do I need to send my old TCM back (core charge)?
No, there is absolutely no core charge or need to return your old part. You can dispose of it or keep it, making the process hassle-free.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases where the TCM itself is the source of the failure, replacing it with this programmed module will resolve the root cause and allow the code to be cleared permanently.
Is this a difficult part to install for a DIYer?
Not at all. For the GMC Canyon, it’s one of the more accessible modules. With basic hand tools and our guide, most people can complete the swap in under 30 minutes.
What kind of warranty is included?
This module is backed by a comprehensive one-year warranty, giving you peace of mind and confidence in your repair.