Is Your Trailblazer EXT Shifting Erratically or Stuck in Gear?
If you’re behind the wheel of a 2006 Chevy Trailblazer EXT and experiencing the frustration of harsh shifts, delayed gear engagement, or a check engine light that points to the transmission, you’re not alone. Over my 20+ years in the shop, I’ve seen countless GMT360 platform vehicles like yours come in with what seems like a catastrophic transmission failure. The good news? Often, the culprit isn’t the transmission itself, but its electronic brain: the Transmission Control Module (TCM).
Just last month, a customer brought in his ’06 Trailblazer EXT. It was slamming into second gear and occasionally getting stuck in limp mode. He was worried about a multi-thousand dollar transmission rebuild. After a quick scan revealed a solenoid circuit code, we identified the true source of the problem—a failing T42 TCM. A simple replacement had him back on the road with a smooth-shifting vehicle the same day.
Common Symptoms of a Failing Trailblazer EXT TCM:
- âś” Sudden, harsh, or jerky gear changes.
- âś” The vehicle refuses to shift out of a single gear (limp mode).
- âś” An illuminated Check Engine Light or Transmission Warning Light.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, or other solenoid-related faults.
- âś” A noticeable drop in fuel economy due to inefficient shifting.
- âś” Complete loss of communication with the module, preventing shifting altogether.
The Direct-Fit Solution: A 2006 Trailblazer EXT Transmission Control Module Programmed to Your VIN
Don’t let a faulty module sideline your SUV. This OEM-quality T42 TCM, part number 24235340, is the definitive solution. The most critical feature is our pre-programming service. We flash the module with your vehicle’s specific VIN and the latest GM software before it even ships. This means it arrives ready for a true plug-and-play installation, eliminating the need for an expensive and time-consuming trip to the dealership for programming.
Expert Pro Tip: Before you install your new TCM, take a close look at the main electrical harness connector. On these Trailblazers, the module is in the left-hand (driver’s side) engine compartment, where it can be exposed to the elements. I’ve found that moisture can cause green corrosion on the pins, leading to poor communication. Cleaning the connector with an electronics-safe contact spray ensures a perfect connection and prevents future issues.
Plug-and-Play Installation: No Dealer Visit Required
You can have your Trailblazer EXT running smoothly again in under 30 minutes with basic hand tools. Here’s a simple guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the TCM: On your 2006 Trailblazer EXT, the module is located in the engine compartment on the driver’s side (LH side).
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt it 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.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to run for a moment. The new module will sync with your vehicle’s systems, restoring proper transmission function. Clear any stored codes with a basic scan tool if needed.
Guaranteed Compatibility and Performance
This module is a direct replacement for a wide range of GM part numbers, ensuring a perfect fit and function. It is built to meet or exceed original equipment standards for long-lasting reliability and is backed by our one-year warranty. Restore the precise, smooth shifting your Trailblazer EXT was designed to have.
This part is interchangeable with the following service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.