End Frustrating Transmission Problems in Your GM Vehicle
If your 2006 Trailblazer EXT is suffering from harsh shifts, getting stuck in gear, or has the check engine light glaring at you, the problem is often not the transmission itself, but its electronic brain: the Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless drivers worry about a costly transmission rebuild when a simple, pre-programmed TCM was the real solution. This T42 Transmission Control Module, part number 24235732, is the definitive fix for these common and frustrating issues, restoring the crisp, reliable performance your vehicle had when it was new.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Sierra with a classic complaint: intermittent, bone-jarring shifts and occasionally getting stuck in 3rd gear (limp mode). He’d already been to another shop that quoted him for a full transmission replacement. On my scan tool, I saw a generic P0700 transmission fault code, but also intermittent communication loss codes with the TCM. Instead of condemning a perfectly good 4L60E transmission, we swapped in one of our pre-programmed T42 modules. The total time on the lift was under an hour. The customer drove away with a perfectly shifting truck, saving thousands of dollars. This is a story I’ve seen play out hundreds of times—the TCM is the culprit far more often than people think.
Is Your Vehicle Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs. This replacement 2006 Trailblazer EXT TCM is designed to correct these exact problems.
- ✔ Harsh, slamming, or erratic gear changes.
- ✔ The vehicle is stuck in limp mode (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Failure to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
A Straightforward 30-Minute Installation
One of the biggest advantages of this module is its simplicity. Because we program it to your vehicle’s specific VIN before shipping, you can skip the expensive trip to the dealership for programming. This is a job most DIYers can handle with basic tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On most compatible vehicles, the TCM is found in the engine compartment. Common locations include the left-hand (driver’s side) strut tower, next to the battery, under the air cleaner box, or on the right-hand (passenger’s side) of the engine bay. For your 2006 Trailblazer EXT, it’s typically in the LH engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new TCM into place and securely plug in the electrical connectors. You’ll hear a click when they are properly seated.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and ensure the check engine light is off. It’s a good practice to use a basic OBD2 scanner to clear any stored fault codes after the installation is complete.
Why Choose Our Pre-Programmed 2006 Trailblazer EXT TCM?
This isn’t just a replacement part; it’s a complete solution. By ordering from us, you get a reliable component that’s ready for immediate installation right out of the box. It restores critical functions like shift timing, torque converter lockup control, and line pressure, ensuring your transmission operates exactly as the manufacturer intended. With a one-year warranty and no core charge, it’s a hassle-free, dependable repair.
Verified Vehicle Compatibility List
This T42 TCM, including part number 24235732, is a direct replacement for a wide range of General Motors vehicles. Please verify your model and the module location noted below.
- Chevrolet Trailblazer EXT (2006): Transmission; (LH engine compartment), (8 cylinder)
- Chevrolet & GMC Trucks/SUVs: Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche (2007-2013, typically next to battery)
- Chevrolet & GMC Vans: Express, Savana (2006-2014, RH engine compartment)
- Chevrolet Cars: Cobalt, HHR, Impala, Monte Carlo, Malibu
- Buick & Cadillac: LaCrosse, Lucerne, Allure, DTS
- Pontiac & Saturn: G5, G6, Grand Prix, Aura, Ion, Vue
- Other GM: Hummer H3, Saab 9-7X, Envoy, Rainier, Colorado, Canyon
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you time and money.
Where is the TCM located on my 2006 Trailblazer EXT?
On the 2006 Trailblazer EXT with an 8-cylinder engine, the TCM is typically located in the left-hand (driver’s side) engine compartment.
Will this fix a P0700 transmission fault code?
Yes, in many cases. The P0700 code is a general fault request from the TCM. If the TCM itself is faulty and causing other codes (like for solenoids), replacing it will often clear the P0700 code and resolve the underlying issue.
What tools are required for installation?
You’ll typically only need basic hand tools, such as a socket set to remove the mounting bolts and possibly a small flathead screwdriver to help release the connector clips. The entire process usually takes less than 30 minutes.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any extra fees or the hassle of returning it.