If your 2008-2012 GMC Canyon is struggling with harsh shifts, getting stuck in gear, or throwing transmission codes, you’re likely dealing with a failed Transmission Control Module (TCM). I’ve seen this exact issue hundreds of times in my 20+ years in the shop. A faulty TCM can make your reliable truck feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical failure that compromises your vehicle’s performance and fuel economy. Don’t let a bad module sideline your truck or force an expensive trip to the dealership.
This is a direct-replacement, OEM-quality T42 Transmission Control Module (part number 24243901) that arrives at your door fully programmed to your Canyon’s specific Vehicle Identification Number (VIN). This means no extra programming fees, no special tools, and no waiting for a dealership appointment. It’s designed to be a true plug-and-play solution that restores the precise, smooth shifting you expect from your vehicle. It directly communicates with the engine computer and transmission solenoids to manage gear changes, torque converter lockup, and line pressure, effectively resolving the root cause of many frustrating transmission problems.
Case Study: A Tricky Diagnosis
A customer brought in his 2011 GMC Canyon complaining of intermittent ‘limp mode’ where the truck would refuse to shift past 2nd gear, and the check engine light was on. His local shop had already replaced two shift solenoids, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) code. Instead of just chasing solenoid codes, we looked at the live data. We saw erratic commands from the TCM. After confirming the wiring harness was intact, we identified the TCM as the culprit. We installed one of our VIN-programmed modules, and the truck was shifting perfectly within 30 minutes. The customer saved hundreds by avoiding further incorrect part replacements and a dealership visit.
Is Your Canyon Showing These Telltale Signs?
- âś” Unpredictable, harsh, or delayed gear shifts that slam into gear.
- âś” The truck is stuck in a single gear (often called ‘limp mode’).
- âś” A lit Check Engine Light or Transmission Warning Light is on your dash.
- âś” Your scan tool shows Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- âś” A noticeable drop in fuel efficiency or a feeling of sluggish acceleration.
- âś” Complete loss of communication with the transmission module.
A Straightforward Guide to Your 2008-2012 Canyon TCM Installation
Installing this module is a job most DIYers can handle in their own driveway in under an hour. For the 2008-2012 GMC Canyon, the TCM is typically located in the engine bay on the right-hand (passenger) side, near the rear of the engine compartment. Always confirm the location on your specific vehicle before starting.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the Module: Find the TCM on the RH rear of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical wiring harnesses. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in the same location. Securely fasten the bolts and reconnect the wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the engine and let it idle for a few minutes. While not always required, using a basic scan tool to clear any stored historical codes is good practice. Take your Canyon for a test drive to confirm the smooth shifting performance.
Verified Fitment for Your Vehicle
This T42 TCM, part number 24243901, is a confirmed fit for the 2008-2012 GMC Canyon. It is also compatible with a wide range of other GM vehicles. Please verify your part number or contact us with your VIN to ensure perfect compatibility.
Also Fits: Chevrolet Colorado (08-12), Hummer H3 (08-10), GMC Savana (06-14), Chevrolet Silverado (07-13), GMC Sierra (07-13), Chevrolet Tahoe (07-09), and many more GM models. This module interchanges with part numbers 24252114, 24234503, 24243921, and others.
Frequently Asked Questions
Is this part really plug-and-play?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your truck’s other systems right out of the box, with no need for a trip to the dealer for expensive programming.
Do I need to return my old TCM (core charge)?
No, there is no core charge for this part. You can keep your old module or dispose of it responsibly without the hassle of returning it.
What tools are required for installation?
Basic hand tools are all that’s needed. A simple socket set to remove the mounting bolts and a flathead screwdriver to help release the connector clips are typically sufficient. No specialized electronic tools are required.
What if my part number is slightly different?
This module replaces many different GM service numbers. The provided fitment list shows a wide range of compatible vehicles and interchange part numbers. If you’re unsure, please send us your VIN, and our experts will verify the correct fitment for you.
What kind of warranty is included?
This transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.