Is Your Trailblazer Shifting Erratically or Stuck in Gear?
There’s nothing more frustrating than a vehicle you can’t rely on. If your 2006-2009 Chevy Trailblazer is experiencing harsh, delayed shifts, getting stuck in limp mode, or throwing transmission-related check engine light codes, a failing Transmission Control Module (TCM) is the most likely culprit. Over my 20+ years in the shop, I’ve seen hundreds of these GMT360 platform vehicles come in with these exact issues. The TCM is the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe.
“A customer’s 2008 Trailblazer came in last week with a classic case: stuck in 3rd gear and a P0753 Shift Solenoid ‘A’ Electrical code. He had already replaced the solenoid inside the transmission pan with no luck. The real problem wasn’t the solenoid, but the TCM itself. Before condemning the module, I always check the main connector at the TCM for any signs of green corrosion or backed-out pins. On these vehicles, moisture can get in and wreak havoc on the connection. After confirming the wiring was good, we installed one of our programmed modules, and the truck was shifting perfectly in under 30 minutes. It’s a common misdiagnosis that can save you a lot of time and money.”
The Direct-Fit Solution: No Dealership Required
This is a direct-replacement T42 TCM, part number 24235340, that arrives at your door pre-programmed to your Trailblazer’s specific Vehicle Identification Number (VIN). This critical step ensures the module communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. You get to skip the expensive trip to the dealership for programming, saving you time and hundreds of dollars in labor and fees. This is the definitive fix for the common issues caused by a faulty 2006-2009 Trailblazer Transmission Control Module.
Symptoms of a Failing Trailblazer TCM
If you’re experiencing any of the following, a new TCM is your solution:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0740, P0750, or other solenoid-specific codes are present.
- ✔ The transmission refuses to upshift or downshift.
- ✔ Poor fuel economy and a feeling of lost power.
- ✔ Complete loss of communication with the transmission module.
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new 2006-2009 Trailblazer Transmission Control Module is a straightforward job that most DIY mechanics can handle in their own driveway. For the Trailblazer, the module is conveniently located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the vehicle’s systems.
- Locate the TCM: On your Trailblazer, find the module mounted in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. 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 our programming handles the critical setup, it’s always a good practice to use a basic OBD2 scan tool to clear any old stored fault codes. Start the vehicle and enjoy smooth, correct shifting.
Guaranteed Compatibility and Reliability
This module is built to meet or exceed original equipment standards for a long service life. It is a direct replacement for multiple part numbers, ensuring a perfect fit for your vehicle. We stand behind our programming and product quality with a full one-year warranty. Restore the performance and dependability of your truck with this essential component.
This 2006-2009 Trailblazer Transmission Control Module is a direct replacement for the following part numbers:
Interchangeable with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, and YNXS.