If your 2008-2012 Chevrolet Colorado is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM trucks sidelined by a failed Transmission Control Module (TCM). The constant heat cycles in the engine bay, especially where this module is located on the Colorado (RH rear engine compartment), can degrade internal electronics over time, leading to frustrating and unpredictable driving behavior. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded.
This T42 TCM, part number 24238856, is the definitive solution. We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your truck’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives ready for a true plug-and-play installation, restoring the precise communication between your engine and the 4L60E transmission. It correctly manages shift points, torque converter lockup, and line pressure, bringing back the smooth, dependable performance you expect from your truck.
Case Study: A Tricky Diagnosis
A customer brought in his ’09 Colorado complaining of intermittent harsh downshifts and occasionally getting stuck in 3rd gear (limp mode), but only after driving for 30+ minutes. The check engine light was on with a general P0700 code. My initial scan showed no specific solenoid faults, which can be misleading. Based on experience, I suspected a heat-related failure in the TCM. After letting the truck cool, it would shift perfectly. We swapped in one of our pre-programmed T42 modules, and the problem was instantly resolved. The original module’s internal circuits were failing once they reached operating temperature—a classic symptom for these units.
Is Your Colorado Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the culprit:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0750-P0758).
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
A Straightforward Guide to Your TCM Replacement
One of the best parts of this solution is its simplicity. You don’t need to be a master mechanic to get your truck back on the road. The entire process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the 2008-2012 Colorado, the TCM is found in the engine compartment, typically mounted on the right-hand (passenger side) rear area.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as old plastic can be brittle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical 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 good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
The Reliable Fix for Your 2008-2012 Colorado TCM
Don’t settle for a temporary fix or pay expensive dealership programming fees. This module is built to meet or exceed OEM specifications and is backed by our one-year warranty, giving you peace of mind for the road ahead. It’s the most direct and reliable way to solve the electronic issues plaguing your transmission and restore your truck’s functionality.
Verified Vehicle Compatibility
This module is a direct fit for the following vehicles. Please ensure your vehicle and options match the description below.
- Chevrolet Colorado (2008-2012) – Transmission; located in RH rear engine compartment
- GMC Canyon (2008-2012) – Transmission; located in RH rear engine compartment
- Hummer H3 (2008-2010) – Transmission; located in RH rear engine compartment
- This module also fits a wide range of other 2006-2014 GM vehicles, including Silverado, Tahoe, Sierra, Yukon, Impala, and more. Verify your part number for an exact match. Interchangeable with: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24239224, and others.
Frequently Asked Questions
Does this module need to be programmed by a dealer?
No. This is the key benefit of our service. We program the module to your vehicle’s VIN before shipping, so it’s ready for installation right out of the box. This saves you time and the high cost of dealership programming.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, inspected and programmed to ensure reliability and performance. It is backed by a one-year warranty.
What is a core charge?
There is no core charge for this part. You are not required to send your old, faulty module back to us, which simplifies the repair process for you.
Will this fix a P0700 code on my Colorado?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the fault, replacing it with our programmed unit will resolve the code and the underlying issue.
What tools do I need for installation?
Basic hand tools are all that’s required, typically a socket set to remove the mounting bolts and possibly a small flathead screwdriver to help release the connector clips. No specialized electronic tools are needed.