Fix Your GMC Canyon’s Shifting Problems for Good
If you’re dealing with a 2008-2012 GMC Canyon that’s shifting erratically, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable truck into a source of constant frustration. This T42 TCM, part number 24235732, is the definitive solution to restore your transmission’s performance and your peace of mind. It arrives pre-programmed to your truck’s specific VIN, making it a true plug-and-play fix that eliminates the need for an expensive trip to the dealership.
A Technician’s Notebook: The Intermittent Canyon
I once had a 2011 GMC Canyon in my bay that was a real head-scratcher. The owner complained of random, harsh 1-2 shifts and occasional slipping, but it wouldn’t act up consistently. We checked the fluid, scanned for codes (only a generic P0700 history code), and tested the solenoids, which all checked out. The issue seemed to disappear after the truck warmed up. After ruling out mechanical faults, we focused on the electronics. On these GM trucks, heat soak in the engine bay can cause the TCM’s internal connections to fail intermittently. We swapped in a VIN-programmed TCM, and the problem was solved instantly. The customer called a week later, thrilled that his truck drove like new again. This is a classic failure mode, and this module is the correct fix.
Is Your Canyon Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways, often getting progressively worse. If your truck is showing any of these signs, a failing module is the most likely culprit. In my shop, nine out of ten times these symptoms point directly to the TCM on this platform.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The truck is stuck in ‘limp mode’ (usually 2nd or 3rd gear) with limited power.
- ✔ The Check Engine Light or a transmission warning light is illuminated.
- ✔ You have active Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0751, P0756, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
A Straightforward Guide to Installation
One of the best features of this module is its ease of installation. For most DIYers with basic tools, this is a job that can be completed in under 30 minutes, saving you hundreds in labor costs. Your 2008-2012 Canyon TCM is located in the engine compartment for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s systems.
- Locate the Module: On the GMC Canyon and Chevy Colorado, the TCM is typically mounted on the right-hand (passenger side) rear of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the truck and let it idle for a few minutes. While not always necessary, using a basic scan tool to clear any stored fault codes is good practice. Take your truck for a test drive to confirm the smooth shifting performance.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2008-2012 Canyon TCM, it is also compatible with the following models. Please verify your part number (24235732) or service number for a perfect match.
- 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 varies, often next to battery)
- Chevrolet Tahoe, Suburban, Avalanche & GMC Yukon: 2007-2009 (Location varies, often next to battery)
- Chevrolet Express & GMC Savana Vans: 2006-2014 (RH engine compartment)
- And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-certified software onto the module before we ship it. This ensures the TCM communicates perfectly with your truck’s engine computer and other systems, just like one from the dealer, but without the high cost and hassle of a dealership visit.
Will this part fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. When you replace a faulty module with our pre-programmed unit, it typically resolves the root cause of the P0700 code and any related solenoid codes.
Is this a difficult part for a DIY mechanic to install?
Not at all. The TCM on the 2008-2012 GMC Canyon is located in an accessible spot in the engine bay. With basic hand tools (like a socket set), the swap takes less than half an hour. Our plug-and-play programming means no special computer tools are needed to complete the job.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process simpler and more convenient for you.
What is the warranty on this module?
This transmission control module is backed by our one-year, hassle-free warranty. We stand by the quality and reliability of our parts to ensure you can buy with complete confidence.