Tired of Erratic Shifting in Your GMC Canyon?
If your 2008-2012 GMC Canyon is struggling with harsh shifts, getting stuck in gear, or throwing transmission codes, the problem often points directly to a failing Transmission Control Module (TCM). As a mechanic with over two decades of diagnostic experience, I’ve seen countless GM trucks and SUVs sidelined by this exact issue. The TCM is the electronic brain of your automatic transmission, and when it fails, it can cause a cascade of frustrating and potentially damaging problems. This isn’t just an annoyance; it’s a critical component for your truck’s performance and safety.
A Technician’s Notebook
I recently had a 2011 Canyon come into the shop. The owner was fed up. The truck would randomly refuse to shift out of 2nd gear (classic limp mode) and had a persistent Check Engine light. His scanner showed a P0752 code for a stuck shift solenoid. He’d already replaced the solenoid, but the problem remained. This is a classic red herring. After a quick check of the wiring, I knew the culprit was the TCM. The internal drivers that control the solenoids had failed. We installed one of our pre-programmed modules, and in less than an hour, the truck was shifting perfectly. The customer saved hundreds by avoiding a dealership visit for programming.
Is Your Canyon Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s time to consider a replacement. Ignoring these symptoms can lead to more severe transmission damage down the line.
- ✔ Unpredictable or harsh gear changes that slam into gear.
- ✔ The vehicle is stuck in a single gear, often called “limp mode,” refusing to upshift or downshift.
- ✔ Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0752, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
Straightforward Installation to Get You Driving Again
One of the best features of this module is that it’s designed for a hassle-free installation. Because we program it to your vehicle’s VIN before shipping, you can skip the expensive trip to the dealership. For the 2008-2012 Canyon TCM, the process is simple enough for a confident DIYer.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the GMC Canyon and Chevy Colorado, the TCM is typically found in the right-hand rear of the engine compartment. It’s a silver box with electrical connectors.
- Remove the Old Unit: Carefully unplug the wiring harnesses. They have locking tabs, so be gentle. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your Vehicle
This T42 Transmission Control Module is a direct replacement for part number 24243921 and is compatible with a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. While this page focuses on the GMC Canyon, it also fits:
- GMC Canyon (2008-2012) – Transmission; (RH rear engine compartment)
- Chevrolet Colorado (2008-2012) – Transmission; (RH rear engine compartment)
- Hummer H3 (2008-2010) – Transmission; (RH rear engine compartment)
- And many other GM cars, trucks, and SUVs including the Silverado, Sierra, Tahoe, Yukon, Impala, and more from 2006-2014. Please verify your part number or contact us for fitment confirmation.
Frequently Asked Questions
What exactly is VIN programming and why is it important?
VIN programming is the process where we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures the TCM communicates perfectly with your truck’s engine computer and other systems, controlling shift points and pressures exactly as the factory intended. It makes the part truly plug-and-play.
Do I need to take my truck to a dealer or mechanic after installation?
No. Our VIN programming service eliminates the need for any additional, expensive programming at a dealership. Once installed, the module is ready to go. The only recommended step is to clear any old codes with a scan tool.
Where is the TCM located on my 2010 GMC Canyon?
For the 2008-2012 GMC Canyon and its sibling, the Chevrolet Colorado, the Transmission Control Module is located in the engine bay, on the right-hand (passenger) side, towards the rear firewall.
What if I still have a Check Engine Light after installing the new TCM?
First, ensure you have cleared all Diagnostic Trouble Codes (DTCs) with a scan tool after installation. If a code returns, it may indicate a separate, underlying issue (like a wiring problem or a faulty sensor) that the original failing TCM was masking or contributing to.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and shipping costs.