Is Your Trailblazer Shifting Erratically or Stuck in Gear?
There’s nothing more frustrating than when your dependable 2006-2009 Chevy Trailblazer starts acting up. One minute it’s driving fine, the next you’re dealing with harsh, slamming shifts, a refusal to downshift, or the dreaded “limp mode” that leaves you stuck in a single gear. In my 20+ years as a technician, I’ve seen this scenario hundreds of times. More often than not, the culprit isn’t a catastrophic transmission failure, but a faulty Transmission Control Module (TCM). This module, part number 24235732, is the brain of your automatic transmission, and when it fails, it creates chaos.
“A customer’s 2008 Trailblazer came in last week with these exact symptoms. The check engine light was on, and it was stuck in 3rd gear, throwing a P0753 shift solenoid code. After confirming the solenoid’s wiring and resistance were good, we knew the driver circuit inside the original TCM had failed. We installed one of our VIN-programmed modules, cleared the codes, and had him back on the road in under an hour, shifting perfectly.”
The Direct Solution for Common Transmission Problems
This T42 Transmission Control Module is the definitive fix for these issues. It arrives at your door pre-programmed to your Trailblazer’s specific Vehicle Identification Number (VIN). This is the most critical feature, as it eliminates the need for an expensive trip to the dealership for programming. It’s a true plug-and-play solution designed to restore the precise, smooth shifting you expect from your vehicle.
Symptoms of a Failing 2006-2009 Trailblazer TCM:
- โ Harsh, delayed, or erratic gear changes.
- โ Vehicle is stuck in one gear (often 2nd or 3rd) and will not shift.
- โ Check Engine Light or Transmission Warning Light is illuminated.
- โ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- โ Poor fuel economy due to incorrect gear selection.
- โ Complete loss of communication with the transmission module.
Key Features & Benefits:
- โ VIN Programmed for Your Trailblazer: We flash the module with the latest GM software for your specific vehicle. This ensures perfect communication and performance right out of the box.
- โ Restores Proper Shifting: By precisely controlling shift points, line pressure, and torque converter lockup, this module brings back smooth and efficient operation.
- โ Built to OEM Standards: Engineered for reliability and longevity, this module is built to handle the demands of your vehicle, backed by our one-year warranty.
- โ No Core Charge: Keep your old part. There’s no need to worry about the hassle and expense of returning a core.
- โ Wide Interchange Compatibility: This module, also known by service number 24235732, replaces a wide range of part numbers including 24252114, 24234503, 24242391, and many more.
Plug-and-Play Installation: No Dealer Visit Required
Installing this module is a straightforward job for a DIYer with basic tools. On the 2006-2009 Trailblazer, you’ll find the TCM in the engine compartment on the driver’s side (LH side).
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the Module: Open the hood and find the TCM. On the Trailblazer, it’s typically mounted in the left-hand (driver’s side) of the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the locking tabs to avoid damage. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place and securely reconnect the electrical connectors.
- Final Steps: Reconnect the negative battery terminal. While the module is programmed, it’s always a good practice to use a scan tool to clear any stored DTCs from the vehicle’s memory. Start the vehicle and enjoy restored performance.
Expert Pro Tip: Check Your Grounds
Before installing the new TCM, take a moment to inspect the main chassis ground straps in the engine bay. On these GM platforms, a corroded or loose ground can cause voltage drops and communication errors that can mimic a failed module. Cleaning the ground connection points with a wire brush is a simple, five-minute step that ensures the new module has a stable connection and prevents future electrical gremlins.