Fix Your Truck’s Shifting Problems for Good
Is your 2008-2012 GMC Canyon struggling with erratic shifting, getting stuck in gear, or flashing a check engine light? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and potentially damaging issues. As a technician with over 20 years of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good truck. This OEM-quality T42 Transmission Control Module, part number 24240449, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay: The Case of the Limp-Mode Canyon
A customer brought in his ’09 Canyon, completely fed up. The truck would randomly get stuck in 3rd gear (limp mode), but only after it had been running for about 20 minutes. His local shop had already replaced a shift solenoid with no change. We scanned it and found a generic P0700 code. Experience told me to look beyond the transmission itself. After confirming the wiring harness was intact, the evidence pointed directly to the TCM. Heat-soak was causing an internal failure in the original module—a common issue I’ve diagnosed on hundreds of these GM platforms. We installed a pre-programmed unit, and the truck has been shifting perfectly ever since. This part saved the customer from a wild goose chase and a much more expensive repair bill.
Is Your GMC Canyon Displaying These Transmission Issues?
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are electronic. If you’re experiencing any of the following, this module is the likely fix you need.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear, often called “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift correctly.
- ✔ A noticeable drop in fuel economy.
- ✔ Intermittent loss of communication with the module (seen with a high-end scan tool).
Why Choose Our Pre-Programmed 2008-2012 Canyon TCM?
This isn’t just a replacement part; it’s a complete solution. The key benefit is our professional VIN programming service. We load your vehicle’s exact VIN and the latest GM software onto the module before it ships. This ensures that it communicates flawlessly with your truck’s engine computer and other systems right out of the box. You get optimal shift performance and reliability without the expensive trip to a dealership for programming. This is the same process they would use, but you get to do the simple installation yourself and save hundreds. This 2008-2012 Canyon TCM is built to meet or exceed original equipment standards for a long service life.
DIY Installation: Get Your Truck Back on the Road Fast
You don’t need to be a master mechanic to replace this module. With basic hand tools, you can have your truck running smoothly in under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the Module: On the 2008-2012 GMC Canyon, the TCM is typically found in the engine bay, on the right-hand (passenger) side, near the rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Bolt the new module into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Final Steps: Reconnect the negative battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes (DTCs). Start the vehicle and take it for a test drive to confirm the shifting issues are resolved.
Verified Vehicle Compatibility
This T42 TCM, part number 24240449, 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 many other models. Please verify your vehicle in the list below. Interchangeable part numbers include: 24252114, 24234503, 24230461, 24234274, 24235340, and more.
This part fits these makes and models with these options:
CANYON 08-12 Transmission; (RH rear engine compartment)
COLORADO 08-12 Transmission; (RH rear engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
…and many other GM cars, trucks, and SUVs from 2006-2014 including the Silverado, Tahoe, Impala, G6, and more as listed in the full fitment data.