Restore Your Trailblazer’s Heartbeat
Is your 2006 Trailblazer EXT acting up? Stalling at lights, hesitating on acceleration, or flashing a stubborn check engine light can turn any drive into a stressful ordeal. You rely on your SUV for everything, and when its brain—the Powertrain Control Module (PCM)—isn’t functioning correctly, it affects every aspect of performance and safety. This isn’t just a faulty part; it’s a loss of confidence in your vehicle. We’re here to restore that confidence with a reliable, straightforward solution.
This genuine Powertrain Control Module is the definitive answer to your vehicle’s electronic woes. We take the guesswork and high dealership costs out of the equation. Before this module ever leaves our facility, it is meticulously programmed with the latest GM software updates, tailored specifically to your vehicle’s unique VIN. This ensures that when it arrives, it’s ready to communicate perfectly with your engine, transmission, and all related systems, restoring the smooth, predictable performance you remember.
A Mechanic’s Notebook: The Trailblazer That Wouldn’t Cooperate
I once had a 2006 Trailblazer in the shop that was a real head-scratcher. The owner had already replaced two oxygen sensors and a MAP sensor trying to fix a rough idle and terrible gas mileage. The codes were all over the place. After checking the wiring and confirming the new sensors were good, I hooked up my scope to the PCM connectors. The signal processing was erratic—the computer was failing internally. We installed one of our VIN-programmed modules, and it was like flipping a switch. The engine smoothed out instantly, the fuel trims corrected themselves, and the owner called me a week later, ecstatic about his fuel savings and the return of his dependable daily driver. Sometimes, the problem lies right at the source.
Is Your Vehicle Showing These Warning Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution to get you back on the road safely:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) pointing to internal module failure, such as P0601, P0606, or U-series communication codes.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
Guided Installation for a Confident Fix
Replacing your 2006 Trailblazer EXT PCM is a manageable task that you can complete with basic hand tools. Our pre-programmed module makes it a plug-and-play process, getting you back behind the wheel faster.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all systems are powered down.
- Locate the Module: On your Trailblazer, the PCM is typically found on the driver’s side of the engine compartment, mounted to the inner fender or firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, VIN-programmed module in the same location. Securely reconnect the electrical harnesses, ensuring they click into place.
- Reconnect Power: Reattach the negative battery terminal and tighten it securely.
- Final Steps: In some cases, a security relearn procedure may be necessary, which can often be done without special tools. Your vehicle’s service manual will have the specific, simple steps. This ensures your key and anti-theft system recognize the new module.
Tailored Fit for Your Ride
This module is a direct replacement for part number 12589311 and is guaranteed to be compatible with the following vehicles and options. Please verify your vehicle is on this list to ensure a perfect match.
- BUICK RAINIER (2006): Electronic Control Module; (LH engine), 4.2L
- CHEVROLET COLORADO (2004-2006): Electronic Control Module; (RH firewall)
- CHEVROLET TRAILBLAZER (2006): Electronic Control Module; (LH engine), 4.2L
- CHEVROLET TRAILBLAZER EXT (2006): Electronic Control Module; (LH engine), 4.2L
- GMC CANYON (2004-2006): Electronic Control Module; (RH firewall)
- GMC ENVOY (2006): Electronic Control Module; 4.2L (LH engine)
- GMC ENVOY XL (2006): Electronic Control Module; (LH engine), 4.2L
- HUMMER H3 (2006): Electronic Control Module; (RH firewall)
- ISUZU ASCENDER (2006): Electronic Control Module; 4.2L (LH engine)
- ISUZU I-280 (2006): Electronic Control Module; (RH firewall)
- ISUZU I-350 (2006): Electronic Control Module; (RH firewall)
- SAAB 9-7X (2006): Electronic Control Module; (LH engine), 6 cylinder
This unit also replaces a wide range of interchangeable part numbers, including: 12569773, 12588650, 12589585, 12591647, 12593531, 12594430, 12596783, 12597521, 12597776, 12600818, 12604438, 12606369, 12606398, 19209820, and more.
Don’t let a faulty computer keep you sidelined. Order your pre-programmed 2006 Trailblazer EXT PCM today and rediscover the peace of mind that comes from a reliable, smooth-running vehicle.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit VIN. You can also add it as a note during checkout. We cannot ship your part until we have this information to ensure it is programmed correctly for your specific vehicle.
Will I need to do anything after installing the module?
Because this module is pre-programmed, it is a plug-and-play installation. However, on many GM vehicles, a simple security relearn procedure (also known as a “key relearn”) is required for the engine to start. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without any special tools.
Where is the PCM located on my 2006 Trailblazer?
On the 2006 Trailblazer with the 4.2L engine, the Powertrain Control Module (PCM) is located in the engine bay on the driver’s side, mounted against the inner fender wall.
Is this a new or used part?
This is a high-quality, genuine OEM component that has been thoroughly inspected, tested, and programmed with the latest software. This process ensures you receive a reliable part that meets or exceeds original factory performance standards without the high cost of a new-from-dealer unit.
What if my original part number isn’t 12589311?
This module is a direct replacement for a wide range of part numbers used in these vehicles. As long as your vehicle’s make, model, year, and engine match the fitment list, this programmed module will function correctly, even if the number on your old part is different.