Restore Your Trailblazer’s Shifting Performance
If you’re dealing with a transmission that seems to have a mind of its own—slamming into gear, refusing to shift, or putting your dash lights on display—you’ve come to the right place. As a technician with over two decades of experience, I know the frustration of a faulty transmission control module (TCM). This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s reliability and safety. This T42 Transmission Control Module, part number 24252114, is the definitive solution for your 2006-2009 Chevrolet Trailblazer, arriving expertly programmed to your vehicle’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay: The Ghost in the Transmission
A few months back, a 2008 Trailblazer was towed into my shop. The owner was at his wit’s end. He described harsh, unpredictable shifts and said the truck was stuck in 3rd gear (limp mode). He’d already replaced two shift solenoids based on a generic P0758 code, but the problem persisted. After a quick scan, I saw the classic P0700 (Transmission Control System Malfunction) alongside the solenoid code. Experience told me the solenoids were likely fine; the TCM was the real culprit. These modules, especially on the GMT360 platform, are notorious for internal circuit failure due to heat and vibration. We installed one of our VIN-programmed TCMs, and in less than an hour, the Trailblazer was shifting as smoothly as the day it left the factory. This part saves you from chasing phantom issues and gets the diagnosis right the first time.
Is Your Trailblazer Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean total transmission failure. Often, it presents a series of electrical and performance-related symptoms. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” The vehicle is stuck in a single gear (often called ‘limp mode’).
- âś” Your Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0740, P0753, P0758, or other solenoid-related faults.
- âś” Inconsistent or complete loss of upshifting or downshifting.
- âś” A noticeable drop in fuel economy or the transmission overheating.
- âś” The vehicle fails to move or has intermittent communication with the scan tool.
The Definitive Solution for Your 2006-2009 Trailblazer TCM
This isn’t just a replacement part; it’s a complete repair solution. The most significant benefit is our professional VIN programming service. When you order, we flash the module with the latest GM software calibrated specifically to your Trailblazer. This eliminates the need for expensive dealership programming, saving you time and hundreds of dollars. It ensures that all shift points, torque converter lockup strategies, and diagnostic parameters are perfectly matched to your vehicle, restoring OEM performance and reliability right out of the box.
A Straightforward Guide to Installation
One of the best parts of this solution is how simple the installation is. You don’t need to be a master mechanic to get this done in your own driveway in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On your 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. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, pre-programmed TCM in the same location and securely fasten it. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the system often resets, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy your smooth-shifting ride!
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page is focused on the Trailblazer, it is also compatible with the following models. Please verify your part number (24252114) for a perfect match.
- Chevrolet Trailblazer: 2006-2009 (V8 models for 06-07) – Located in LH engine compartment.
- GMC Envoy / Envoy XL: 2006-2009 (V8 models for 06-07) – Located in LH engine compartment.
- Chevrolet Silverado & GMC Sierra 1500/2500: 2007-2013 (Check notes for specific locations, usually next to the battery).
- Chevrolet Tahoe & GMC Yukon: 2007-2009 – Located next to the battery.
- Chevrolet Impala / Monte Carlo: 2006-2011 – Located under the lower air cleaner housing.
- And many more models from Buick, Cadillac, Pontiac, Saturn, and Hummer.
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This is the biggest benefit we offer. We program the module to your vehicle’s VIN before shipping, so it’s ready for immediate installation without any additional programming or dealer visits.
Is there a core charge for my old part?
Absolutely not. You can keep your old module or recycle it at your convenience. There’s no need to worry about shipping it back to us.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. While this module often resolves the root cause (like an internal short that triggers other codes), you should always diagnose any other specific codes (e.g., for solenoids or sensors) that are present alongside it. In many cases, a faulty TCM is the primary failure.
What kind of warranty is included?
This module comes with a one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.
Where is the TCM located on my 2007 Trailblazer?
For the 2006-2009 Chevrolet Trailblazer, the Transmission Control Module is located in the engine bay on the driver’s side (left-hand side).