Restore Crisp, Reliable Shifting to Your GMC Canyon
If your 2008-2012 GMC Canyon is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a common failure point: the Transmission Control Module (TCM). As a mechanic with over two decades of diagnostic experience, I’ve seen countless GM trucks and SUVs sidelined by a faulty TCM. The symptoms can start small, like a slight hesitation between gears, but they often escalate into serious drivability and safety issues, including limp mode or a complete loss of communication with the transmission.
This T42 Transmission Control Module is the definitive solution. It arrives at your door fully pre-programmed to your truck’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. It’s a true plug-and-play fix designed for both professional technicians and determined DIYers who want to get their truck running right again without the hassle. This module directly resolves the root cause of many electronic transmission faults, giving you back the smooth performance and dependability you expect from your Canyon.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Canyon complaining of intermittent ‘no-shift’ conditions and a check engine light. His local shop had already replaced a shift solenoid, but the problem persisted. After connecting my scan tool, I saw the classic P0700 (Transmission Control System Malfunction) code, but also intermittent communication loss codes. Instead of just throwing more parts at it, we inspected the TCM. After 20 minutes of diagnostics, we confirmed the module itself was failing internally. We installed one of our pre-programmed TCMs, and the truck has been shifting perfectly ever since. This is a prime example of how a failing module can mimic other component failures.
Is Your GMC Canyon Exhibiting These Telltale Signs?
- ✔ Harsh, slamming shifts or erratic gear changes.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0755, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A sudden drop in fuel economy or signs of the transmission overheating.
- ✔ Complete failure to shift gears or loss of communication with the module.
A Straightforward Guide to Installation
For the 2008-2012 GMC Canyon, this is a repair you can confidently tackle in your own driveway. The entire process typically takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On your Canyon, the TCM is typically found in the engine compartment on the right-hand (passenger) side, near the rear of the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. 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 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!
Verified Vehicle Compatibility
This module, part number 24238856, is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the 2008-2012 Canyon TCM, it also fits other models. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Partial Fitment List:
- 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: 2007-2013 (Location: next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (Location: next to battery)
- Chevrolet Express / GMC Savana Vans: 2006-2014 (RH engine compartment)
- Chevrolet Impala: 2006-2011 (Lower air cleaner housing)
- Pontiac G6 / Cobalt / HHR: 2006-2011 (LH strut tower area)
- And many more GM models from 2006-2014.
Frequently Asked Questions
Does this module really not require dealer programming?
That’s correct. We program the module to your vehicle’s VIN before it ships. This makes the installation process simple, saving you hundreds of dollars and the hassle of a dealership visit. It’s ready to install right out of the box.
Do I need to send my old part back (core charge)?
No, there is absolutely no core charge. You can keep your old part or dispose of it at your convenience, making the transaction simple and straightforward.
What if I’m not sure if the TCM is my problem?
Common symptoms include erratic shifting and codes like P0700. If you’re unsure, we recommend consulting a professional mechanic for a diagnosis or contacting our expert support team with your vehicle’s symptoms and any trouble codes you’ve read.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you confidence and peace of mind in your repair.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming.