Is Your Chevy Colorado Shifting Erratically?
If your 2008-2012 Chevrolet Colorado is experiencing harsh shifting, delayed gear engagement, or has a check engine light illuminated, a faulty Transmission Control Module (TCM) is a very likely culprit. The TCM is the electronic brain of your truck’s automatic transmission, responsible for managing shift points, torque converter clutch operation, and fluid pressure. When it fails, it can cause a wide range of drivability issues, from annoying hiccups to leaving you stranded in limp mode.
From the Diagnostic Bay
We had a 2010 Colorado come into the shop with classic symptoms of a failing transmission—slipping between gears and a P0700 code. The owner had already spent a few hundred dollars replacing a couple of shift solenoids, believing they were the issue. After the new solenoids didn’t fix the problem, he brought it to us. A quick scan and data stream analysis showed that the TCM was sending erratic commands to the very solenoids he had just replaced. The internal circuitry of the original module had failed. We installed one of our VIN-programmed T42 TCMs, cleared the codes, and the truck was shifting perfectly within 30 minutes. It’s a common story: chasing symptoms instead of the root cause can be costly. A faulty TCM can mimic many other transmission problems, making proper diagnosis key.
Symptoms of a Failing 2008-2012 Colorado TCM
A failing TCM doesn’t always mean a complete transmission failure. Often, the signs are subtle at first and worsen over time. Pay close attention if your truck exhibits any of the following behaviors, as they point directly to a compromised transmission computer.
- ✔ Harsh or Erratic Shifting: Your truck may slam into gear, hesitate, or shift at the wrong times.
- ✔ Stuck in Gear / Limp Mode: The transmission may refuse to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Transmission Warning Lights: The Check Engine Light or a dedicated transmission warning light will often illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (e.g., P0750, P0751).
- ✔ Delayed Engagement: A noticeable delay when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup can lead to a sudden drop in your MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM at all.
The Direct-Fit, Programmed Solution
Replacing your TCM shouldn’t require a trip to the dealership and expensive programming fees. This genuine GM T42 Transmission Control Module, service number 24241806, arrives at your door pre-programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the correct software and shift strategies for your Colorado’s exact configuration, making installation a true plug-and-play process. Simply provide your VIN at checkout, and we handle the rest. This module is built to OEM specifications for reliability and longevity, restoring the smooth, predictable performance you expect from your vehicle.
This module is a direct replacement for a wide range of original part numbers, including 24252114, 24234503, 24230461, 24241806, and more, ensuring broad compatibility across the GM family of vehicles from 2006-2014 that use the 4-speed automatic 4L60E, 4L65E, or 4L70E transmissions.
Frequently Asked Questions
Why is VIN programming necessary for this TCM?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it communicates correctly with the Engine Control Module (ECM) and other vehicle systems, controlling shift points and pressures exactly as the manufacturer intended. Without it, the transmission will not function correctly.
Is this a difficult part to install myself?
For the 2008-2012 Colorado, the TCM is located in the right-hand rear of the engine compartment, making it reasonably accessible. With basic hand tools, the installation can typically be completed in under 30 minutes. The most important steps are to disconnect the battery before you begin and to ensure the connectors are fully seated on the new module.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep your old module, which saves you the time, cost, and hassle of return shipping.
How do I know if this part number is correct for my vehicle?
While this part fits 2008-2012 Colorado models, it’s always best to verify. You can match the part number on your existing module to 24241806 or one of the interchangeable numbers listed. Alternatively, use our website’s vehicle lookup tool or contact our expert support with your VIN, and we can guarantee the correct fitment.
What happens if I don’t clear the codes after installation?
While the new module will resolve the root cause of the problem, the old fault codes may remain stored in the vehicle’s computer system. This can keep the check engine light on. Disconnecting the battery often clears them, but using a basic OBD2 scan tool to clear any stored and pending transmission codes is the best practice for a clean slate.