Restore Smooth, Reliable Shifting to Your GMC Canyon
If your 2008-2012 GMC Canyon is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a common failure of the Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good truck. This T42 Transmission Control Module, part number 24239926, is the definitive, hassle-free solution to get your vehicle operating correctly again.
The beauty of this module lies in our pre-programming service. We flash it with your truck’s specific Vehicle Identification Number (VIN) and the latest GM software updates before it even ships. This means it arrives at your door ready for a true plug-and-play installation, completely eliminating the need for an expensive trip to the dealership for programming. This is the exact fix I’d perform in my own shop to solve shifting problems efficiently and permanently.
A Technician’s Notebook: The Case of the Hesitant Hummer H3
A customer brought in a Hummer H3 with a classic complaint: intermittent, bone-jarring shifts and a persistent check engine light. The codes pointed to a solenoid circuit failure (P0752), but testing the solenoids themselves showed they were fine. After years of diagnosing these GM platforms, I knew the real culprit was likely the T42 TCM. Internal circuit board failures can cause the module to send faulty commands, mimicking a solenoid issue. We installed a VIN-programmed TCM, cleared the codes, and the truck shifted like it just rolled off the assembly line. This is the same reliable fix for your 2008-2012 Canyon TCM.
Is Your Truck Showing These Symptoms?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time for a replacement:
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ Vehicle stuck in “limp mode,” often locked in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as the general P0700 or specific solenoid codes like P0750, P0751, P0752, etc.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable drop in fuel economy as the transmission operates inefficiently.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. The process is simple and can be completed in under 30 minutes with basic hand tools. For the GMC Canyon and Chevy Colorado, the TCM is conveniently located in the right-hand rear of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Find the TCM on the right-hand (passenger side) rear of the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. You’ll hear a ‘click’ when they’re seated correctly.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory.
Will This Fit My Vehicle?
This T42 TCM is guaranteed to fit a wide range of General Motors vehicles. While it’s the perfect solution for the 2008-2012 Canyon TCM, it also fits many other popular models. Please verify your vehicle is on the list below.
- 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)
- Chevrolet Silverado & GMC Sierra (2007-2013) – Transmission; (next to battery)
- Chevrolet Tahoe & GMC Yukon (2007-2009) – Transmission; (next to battery)
- Chevrolet Express & GMC Savana (2006-2014) – Transmission; (RH engine compartment)
- And many more GM cars, trucks, and SUVs. This module interchanges with part numbers 24252114, 24234503, 24239926, and others.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you time and money.
Is there a core charge for my old part?
Absolutely not. There is no core charge, so you can keep or dispose of your old module without any hassle.
Will this fix my P0700 transmission code?
Yes. A P0700 code is a general fault code indicating the TCM has detected a problem. Replacing a faulty TCM with this programmed unit will resolve the underlying issue causing the code.
What kind of warranty is included?
This module is backed by our solid one-year warranty, giving you peace of mind and confidence in your repair.
What if I have trouble with the installation?
Our team of experienced automotive experts is here to help. If you have any questions during the process, you can contact us for support.