Restore Crisp, Reliable Shifting to Your Chevrolet Colorado
If your 2008-2012 Chevrolet Colorado is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM dictates every gear change and torque converter operation. When it fails, drivability suffers, fuel economy plummets, and you risk further damage to your transmission. This OEM-quality T42 TCM, part number 24241806, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play fix.
Over my 20 years in diagnostics, I’ve seen countless GM trucks and SUVs sidelined by TCM issues. The symptoms can be intermittent and frustrating, often leading to incorrect diagnoses of solenoids or even the transmission itself. A faulty module can cause erratic line pressure, leading to slipping clutches and burned fluid. Replacing it with a properly programmed unit like this one isn’t just a repair; it’s preventative maintenance that protects your entire drivetrain. This module ensures your transmission receives the correct commands, restoring the smooth, predictable performance you depend on for work or daily driving.
A Technician’s Notebook: The Case of the Hesitant H3
A customer brought in a Hummer H3 (which uses the same T42 TCM as the Colorado) with a complaint that baffled two other shops. It would occasionally refuse to upshift from 2nd gear after a cold start, but only on certain days. No hard codes were stored, just a generic P0700 (Transmission Control System Malfunction). We monitored live data and saw the command for the 2-3 shift was being sent, but the pressure control solenoid data was erratic. Instead of just replacing solenoids, we inspected the TCM. We found no visible damage, but experience pointed to an internal logic failure. We installed one of our VIN-programmed T42 modules, and the problem vanished instantly. The customer called a week later, thrilled that his truck was finally driving like new. It’s a classic example of how a failing module can create phantom symptoms that only a direct replacement can solve.
Is Your Colorado Showing These Telltale Signs of TCM Failure?
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Your scanner shows Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756, or other solenoid-related faults.
- ✔ The transmission shifts harshly, slams into gear, or hesitates between shifts.
- ✔ Your truck is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ You experience a sudden loss of power or a significant drop in fuel efficiency.
- ✔ The vehicle delays engaging into Drive or Reverse.
A Straightforward Guide to Your TCM Installation
Replacing the TCM on your Colorado is a job most DIYers can handle in under 30 minutes with basic tools. For the 2008-2012 Colorado and GMC Canyon, the module is located in the engine bay on the right-hand (passenger side) rear firewall.
- 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 several large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug in the wiring harness connectors, ensuring they click and lock into position.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s good practice to use a basic scan tool to clear any stored fault codes from other modules. Start the truck and enjoy smooth shifting!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page is focused on the 2008-2012 Colorado TCM, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- Chevrolet Colorado (2008-2012) – Transmission; (RH rear engine compartment)
- GMC Canyon (2008-2012) – Transmission; (RH rear engine compartment)
- Hummer H3 (2008-2010) – Transmission; (RH rear engine compartment)
- Chevrolet Silverado / GMC Sierra 1500, 2500 (2007-2013) – Transmission; (next to battery)
- Chevrolet Tahoe / Suburban / GMC Yukon (2007-2009) – Transmission; (next to battery)
- Chevrolet Express / GMC Savana Vans (2006-2014) – Transmission; (RH engine compartment)
- And many other GM cars, trucks, and SUVs from 2006-2014. Please check the full fitment list or contact us with your VIN to confirm.
Frequently Asked Questions
Do I need to take my truck to the dealership for programming?
No. This module comes fully programmed to your vehicle’s VIN number. It is ready for installation right out of the box, saving you hundreds in dealer fees and programming time.
What does “T42” refer to?
T42 is the hardware designation given by GM for this generation of 4-speed automatic transmission control modules. It ensures you are getting the correct controller architecture for vehicles like the Colorado, Silverado, and Tahoe equipped with transmissions like the 4L60E and 4L65E.
Is this a new or used part?
This is a high-quality, OEM-spec replacement part that has been expertly prepared and programmed for your vehicle. It is backed by our one-year warranty for your peace of mind.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the root cause is the TCM itself. While this module will resolve the issue if the TCM is faulty, you should always check for other specific codes (like solenoid or sensor codes) to confirm your diagnosis.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any extra hassle or fees.