End Your Transmission Headaches with a Plug-and-Play Solution
If your 2006 Chevrolet Trailblazer EXT is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As an experienced technician, I’ve seen countless GM vehicles sidelined by this exact issue. The TCM is the brain of your automatic transmission, and when it fails, it creates frustrating and potentially unsafe driving conditions. This T42 TCM, part number 24239224, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a seamless, no-hassle installation.
Forget about expensive dealership visits and the need for specialized programming tools. We handle the complex part for you. By programming the module with the latest GM software updates before it ships, we ensure it communicates perfectly with your vehicle’s engine computer and other systems right out of the box. This restores the precise, smooth shifting and reliable performance you expect from your Trailblazer.
Case Study: The Ghost in the Transmission
A customer brought in a 2006 Trailblazer EXT with a maddeningly intermittent problem. It would shift perfectly for days, then suddenly start slamming into gear or refuse to upshift, throwing a P0750 solenoid code. They had already replaced the shift solenoid with no luck. After connecting my diagnostic scanner and monitoring live data, I noticed the command signals from the TCM were dropping out randomly, especially after the engine bay warmed up. The problem wasn’t the solenoid; it was the TCM itself. Heat-related stress had caused a micro-fracture on the circuit board. Installing a pre-programmed 2006 Trailblazer EXT TCM like this one resolved the issue instantly and permanently, saving the customer from further misdiagnosis and costly part-swapping.
Is Your Trailblazer Showing These Symptoms?
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in a single gear (often called “limp mode”).
- ✔ The Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750, P0751, etc.).
- ✔ Inability to shift up or down, leading to poor acceleration and fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
Replacing the TCM on your Trailblazer is a job most DIYers can complete in under 30 minutes with basic hand tools. This module is typically located in the engine compartment for easy access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard systems.
- Locate the Module: On the 2006 Trailblazer EXT, the TCM is found in the left-hand (driver’s side) 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. Start the vehicle and let it run for a minute. While our programming resolves most codes, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes to ensure a clean slate.
Verified Vehicle Compatibility for Part 24239224
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2006 Trailblazer EXT TCM, it is also compatible with the following models. Please verify your specific model and options.
- Chevrolet: Trailblazer (8 cyl), Trailblazer EXT (8 cyl), Tahoe, Silverado, Suburban, Express, Impala, Monte Carlo, HHR, Cobalt, Colorado, Avalanche
- GMC: Envoy (8 cyl), Envoy XL (8 cyl), Yukon, Sierra, Savana, Canyon
- Buick: Rainier, LaCrosse, Lucerne, Allure, Rendezvous
- Cadillac: DTS
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This module interchanges with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239926, 24240400, and more.
Frequently Asked Questions
Does this module really come programmed to my VIN?
Yes. During checkout, you will provide your vehicle’s 17-digit VIN. We use this to load the exact GM-specified software for your Trailblazer’s configuration, ensuring it works correctly right out of the box.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set are all you need to unbolt the old module and install the new one. The most important part is that no programming tools are needed.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us.
What if I still have a Check Engine Light after installation?
Our programming clears all module-related faults. However, your vehicle may have stored old codes in its main computer (PCM). We recommend using a standard OBD2 scanner to perform a final “clear codes” function after installation to turn off the light.
What kind of warranty is included?
This transmission control module comes with a one-year warranty, covering any defects in materials or workmanship for your peace of mind.