End Your Transmission Troubles with a Reliable, Programmed TCM
If your 2006 Chevrolet TrailBlazer EXT is suffering from jerky shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re dealing with a loss of performance and safety. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). The T42 module, in particular, is the brain of your automatic transmission, and when it fails, the symptoms can range from poor fuel economy to a complete inability to drive. This is the definitive solution: a high-quality, direct-fit 2006 TrailBlazer EXT TCM, pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Phantom Shifting Problem
I once had a 2006 TrailBlazer EXT in my bay with a classic complaint: “It shifts fine when it’s cold, but after 20 minutes on the highway, it starts banging into gear and sometimes gets stuck in 3rd.” The customer had already replaced two shift solenoids with no luck. After connecting my scan tool, I saw no hard codes, just a history of intermittent solenoid circuit faults. Experience told me this wasn’t a mechanical issue. The TCM on these GMT360 platform vehicles is mounted in the engine bay where it’s exposed to constant heat cycles. Over time, the internal circuit boards develop micro-fractures that only cause issues when the module gets hot. We installed a VIN-programmed TCM, and the problem was solved instantly. It’s a textbook example of how replacing the right electronic part saves hundreds in wasted diagnostic time and parts.
Is Your TrailBlazer Showing These Signs of TCM Failure?
A failing TCM can mimic other transmission problems, but there are several tell-tale signs. If you’re experiencing any of the following, there’s a strong chance your module is the culprit.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in “limp mode,” usually in 2nd or 3rd gear, with no ability to upshift or downshift.
- ✔ The Check Engine Light or a dedicated transmission warning light is illuminated on your dash.
- ✔ Your scan tool shows Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or U-series communication codes.
- ✔ A noticeable drop in fuel efficiency as the transmission isn’t shifting at the optimal points.
- ✔ Complete failure to engage a gear from Park or Neutral.
Your 30-Minute Path to Smooth Shifting
One of the best features of this module is its straightforward installation. You don’t need a vehicle lift or specialized transmission tools. For the DIYer, this is a job you can confidently tackle in your driveway in under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On your 2006 TrailBlazer EXT, the TCM is typically found in the engine compartment on the driver’s side (LH side).
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid breaking the plastic tabs. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module securely onto the bracket and firmly reconnect the electrical harnesses until they click into place.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the ECU. Start the vehicle and enjoy restored performance!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for part number 24243901 and other service numbers. While it is guaranteed to fit your 2006 TrailBlazer EXT, it is also compatible with a wide range of other General Motors vehicles. Please verify your specific model and options below.
This part fits the following vehicles:
- TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
- ENVOY 06-09 Transmission; (LH engine compartment)
- SAAB 9-7X 06-09 Transmission; (LH engine compartment)
- RAINIER 06-07 Transmission
- SILVERADO, SIERRA, TAHOE, YUKON, SUBURBAN, AVALANCHE (07-13, typically next to battery)
- EXPRESS & SAVANA VANS (06-14, typically RH engine compartment)
- IMPALA, MONTE CARLO, LACROSSE, GRAND PRIX (06-11, typically under air cleaner housing)
- COBALT, G5, G6, HHR, ION (06-11, typically on or near LH strut tower)
- And many more models. Please use our vehicle selector tool to confirm an exact match.
Frequently Asked Questions About This 2006 TrailBlazer EXT TCM
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your engine computer and other systems right out of the box, eliminating the need for an expensive programming service at a dealership.
Do I need any special tools for installation?
No. Basic hand tools, like a socket set to remove the mounting bolts and disconnect the battery, are all that’s required. The entire process is designed to be simple for both professional technicians and DIY enthusiasts.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. Replacing a faulty module with this pre-programmed unit is a very common and effective fix for a P0700 code, especially when accompanied by other solenoid or shifting-related codes.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it at your convenience, making the transaction simple and hassle-free.
What kind of warranty is included?
This module comes with a one-year warranty, giving you confidence and peace of mind in your repair.