If your 2008-2012 Chevrolet Colorado is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your reliable truck feel unpredictable and unsafe. This T42 series TCM, corresponding to part number YNXS, is the definitive, hassle-free solution. It arrives expertly programmed to your truck’s specific VIN, eliminating the need for expensive dealership flashing and ensuring a true plug-and-play repair.
A Technician’s Notebook
I remember a 2010 Colorado that came into my bay with a classic case of intermittent transmission woes. The owner had already replaced a shift solenoid on another mechanic’s advice, but the problem persisted: harsh 1-2 shifts when cold, and occasionally it would refuse to shift out of 3rd gear on the highway. A scan showed a generic P0700 code. After checking the wiring harness for damage, we focused on the TCM. In these trucks, heat cycles and vibration can cause internal fractures on the circuit board. We installed one of our VIN-programmed T42 modules, and the difference was immediate. The shift points were crisp and correct, and the problem never returned. It’s a textbook example of why throwing parts at a problem is less effective than accurately diagnosing the electronic controller first.
Is Your Colorado Exhibiting These Telltale Signs?
A failing TCM doesn’t heal itself; it only gets worse. If you’re experiencing any of the following, it’s time for a replacement:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” Your truck is stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” The Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- âś” Inability to upshift or downshift, leading to poor acceleration and terrible gas mileage.
- âś” The transmission seems to slip between gears.
- âś” Unexplained communication errors with the transmission system.
Why a Programmed 2008-2012 Colorado TCM is the Smart Fix
This isn’t just a replacement part; it’s a complete solution. The T42 TCM is the command center for your 4L60E or similar 4-speed automatic transmission. It precisely controls shift solenoids, manages torque converter clutch lockup, and monitors transmission fluid temperature and pressure. Our process ensures this module works perfectly with your vehicle’s existing systems right out of the box.
Your Step-by-Step Installation Guide
- âś” Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- âś” Locate the Module: On the 2008-2012 Colorado and Canyon, the TCM is typically located in the engine compartment on the right-hand (passenger) side, towards the rear.
- âś” Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- âś” Install the New TCM: Mount the new, pre-programmed module in the same location and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- âś” Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes from the system. Start the truck and test drive to confirm smooth shifting.
Will This Fit My Truck?
This transmission control module is guaranteed to be a direct-fit replacement for the following vehicles and configurations:
- Chevrolet Colorado 2008, 2009, 2010, 2011, 2012 (Transmission; RH rear engine compartment)
- GMC Canyon 2008, 2009, 2010, 2011, 2012 (Transmission; RH rear engine compartment)
- Hummer H3 2008, 2009, 2010 (Transmission; RH rear engine compartment)
It is also a compatible replacement for a wide range of other GM vehicles from 2006-2014 that use the T42 TCM. This part interchanges with service numbers 24252114, 24234503, 24230461, 24240449, and YNXS.
Frequently Asked Questions
Why is VIN programming so important?
VIN programming loads your truck’s specific software and calibrations onto the module. Without it, the TCM won’t communicate correctly with the engine computer and other systems, leading to continued shifting problems or a no-start condition. Our service saves you a trip to the dealer and a hefty programming fee.
Is this installation difficult for a DIYer?
Not at all. If you can use a basic wrench and disconnect a battery, you can do this job. The module is easily accessible in the engine bay, and the entire process typically takes less than 30 minutes.
What does “no core charge” mean?
It means you don’t have to pay an extra deposit and go through the hassle of sending your old, broken part back to us. You can keep it or dispose of it yourself, simplifying your repair process.
Will this fix a P0700 transmission code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, the fault is internal to the TCM itself. Replacing a faulty TCM is a very common and effective way to resolve a P0700 code and the more specific codes it has stored.
What is the warranty on this part?
This module is backed by our one-year warranty, giving you confidence and peace of mind in your repair.