Restore Smooth Shifting to Your Trailblazer
Is your 2006-2009 Chevrolet Trailblazer suffering from jerky shifts, getting stuck in gear, or throwing transmission codes? These are classic signs of a failing Transmission Control Module (TCM). As a technician with over 20 years of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good vehicle. This T42 TCM, part number 24235754, is the definitive solution. We pre-program it to your vehicle’s specific VIN, so it arrives ready for a true plug-and-play installation, eliminating the need for a costly trip to the dealership.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Trailblazer with an intermittent ‘limp mode’ issue. No specific solenoid codes, just a generic P0700 (Transmission Control System Malfunction). The problem only happened after driving for 30+ minutes on a hot day. After checking the wiring and fluid, I suspected the TCM was failing under heat. We swapped in one of our VIN-programmed modules, and the problem vanished. The original TCM’s internal circuits were breaking down when temperatures rose, a common failure point I’ve diagnosed on hundreds of these GM platforms.
Is Your Trailblazer Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s highly likely this module is the culprit.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or transmission warning light is on.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Complete failure to shift up or down.
- ✔ Decreased fuel economy and potential transmission overheating.
Your Step-by-Step Guide to a 30-Minute Fix
Installing your new 2006-2009 Trailblazer TCM is a straightforward job for any DIYer or professional mechanic. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work.
- Locate the Module: On the 2006-2009 Trailblazer, the TCM is typically found 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 the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in the same location and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any stored DTCs from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 module is a direct-fit replacement for the 2006-2009 Trailblazer TCM and is also compatible with a wide range of other GM vehicles. It interchanges with part numbers including 24234503, 24252114, and 24235754. Please verify your vehicle in the list below:
- Chevrolet Trailblazer: 2006-2009 (8 cylinder models for 06-07)
- GMC Envoy / Envoy XL: 2006-2009 (8 cylinder models for 06-07)
- Chevrolet Silverado & GMC Sierra: 2007-2013 (various configurations)
- Chevrolet Tahoe & GMC Yukon: 2007-2009
- Chevrolet Impala & Monte Carlo: 2006-2011
- Pontiac G6 & Grand Prix: 2006-2010
- Chevrolet Cobalt & HHR: 2006-2011
- Saturn Vue & Aura: 2007-2010
- Saab 9-7X: 2006-2009
- …and many more GM models from 2006-2014.
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, just like an OEM part installed at the dealership.