If you’re dealing with erratic shifting, a check engine light, or your 2008-2012 Chevrolet Colorado is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of experience, I’ve seen this exact issue countless times on these otherwise tough trucks. The original TCM, part number 24234503, is a known failure point. This replacement T42 TCM is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play fix that restores factory performance without a trip to the dealership.
The TCM is the brain of your automatic transmission, controlling everything from shift points and line pressure to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the frustrating and sometimes dangerous symptoms you’re experiencing. Our module is built to meet or exceed OEM specifications, ensuring it can handle the demands of daily driving or heavy-duty work, giving you back the smooth, reliable performance you depend on.
From the Diagnostic Bay: The Case of the Stubborn Colorado
A customer brought in his ’09 Colorado, complaining it felt like it was “fighting him.” It would shift hard from 1st to 2nd, then hesitate before slamming into 3rd. He had a P0700 code, which is a general transmission fault request. After a quick scan, we found specific solenoid circuit codes. While this can sometimes point to an internal issue, my experience with these trucks immediately led me to the TCM. We swapped in one of our VIN-programmed modules, cleared the codes, and took it for a test drive. The shifting was immediately crisp and smooth, just like it left the factory. It’s a 30-minute fix that solves a major headache, and this is the part that does it.
Is Your Colorado Exhibiting These Telltale TCM Failure Signs?
A faulty 2008-2012 Colorado TCM will make its presence known. If you’re noticing any of the following, it’s time to consider a replacement. Ignoring these symptoms can lead to more significant transmission damage down the line.
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The truck getting stuck in a single gear (often 2nd or 3rd), known as “limp mode.”
- ✔ An illuminated Check Engine Light or Transmission Warning Light on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Poor acceleration and a noticeable drop in fuel economy.
- ✔ The transmission seems to slip out of gear or fails to engage properly from Park.
DIY Installation Guide: Get Your Colorado Shifting Smoothly
One of the best features of this module is its straightforward installation. You don’t need a professional lift or specialized tools. For the 2008-2012 Colorado and GMC Canyon, the TCM is located in the engine bay, making it easily accessible.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On your Colorado or Canyon, the TCM is typically found on the right-hand (passenger) side, towards the rear of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical harnesses. There may be a locking tab you need to slide or press. Once disconnected, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, VIN-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. Start the truck and let it idle for a few minutes. If you have a basic OBD2 scanner, it’s a good practice to clear any stored fault codes. Take the truck for a test drive to confirm the shifting issues are resolved.
Verified Fitment for Your GM Truck or SUV
This T42 Transmission Control Module, corresponding to part number 24234503, is the correct replacement for a wide range of General Motors vehicles. While this listing focuses on the 2008-2012 Colorado TCM, it is also compatible with the models listed below. Please verify your vehicle and part number to ensure a perfect match.
Interchangeable Part Numbers: 24242391, 24252114, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and others.
- Chevrolet Colorado (2008-2012)
- GMC Canyon (2008-2012)
- Hummer H3 (2008-2010)
- Chevrolet & GMC Full-Size Trucks & SUVs (Check specific year/model in the full fitment list)
Frequently Asked Questions
Does this module need to be programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming or dealer visits required. This saves you time and hundreds of dollars in dealership fees.
Is this a difficult part for a DIYer to install?
Not at all. For the Colorado and Canyon, the TCM is located in an easy-to-reach spot in the engine bay. With basic hand tools, the swap typically takes less than 30 minutes, making it a perfect job for a weekend mechanic.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this module, so you can keep your old part without any hassle or need to ship it back.
Will this fix a P0700 check engine light code?
A P0700 code is a general alert from the TCM to the main computer (ECM) that a transmission-related fault exists. This module often resolves the underlying issues (like solenoid faults) that trigger the P0700 code. After installation, you should clear all codes with a scanner.
What if I have a different GM vehicle?
This T42 TCM fits a very wide range of GM vehicles from 2006-2014, including the Silverado, Tahoe, Yukon, Impala, and many more. Please check our detailed fitment list or contact us with your VIN to confirm compatibility.