Is Your 2006 Trailblazer EXT Running Rough?
There’s nothing more frustrating than a vehicle that won’t run correctly. If your 2006 Chevrolet Trailblazer EXT is experiencing baffling issues like stalling, poor fuel economy, a persistent Check Engine Light, or a no-start condition, the problem might be its electronic brain: the Powertrain Control Module (PCM). The PCM is the central command center for your engine’s performance and efficiency, and when it fails, it can cause a wide range of confusing and performance-robbing symptoms.
Don’t let a faulty computer keep your reliable SUV off the road. This is a direct-fit replacement Powertrain Control Module for your vehicle, part number 12589311. The best part? We take the guesswork and expensive dealership visits out of the equation. We will program this module specifically for your vehicle using your unique Vehicle Identification Number (VIN). This ensures that it communicates perfectly with your Trailblazer’s existing systems, just as the original did from the factory, but with the benefit of the latest software updates from GM.
From the Diagnostic Bay
We had a 2006 Envoy come into the shop with a classic complaint: intermittent stalling at stop lights and a check engine light that would come and go. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump based on advice from forums and another shop. The problem persisted. When we hooked up our scanner, we saw erratic data from multiple sensors. Instead of chasing ghosts and replacing more good parts, we focused on the common denominator—the PCM. A faulty processor was corrupting the data signals. We installed a VIN-programmed PCM, and the truck ran perfectly. It’s a powerful reminder that the computer’s health is just as critical as the mechanical parts it controls.
Common Symptoms of a Failing 2006 Trailblazer EXT PCM
- ✔ Check Engine Light: The light is on, and you may have error codes that are difficult to diagnose or point to multiple sensor failures (e.g., P0601, P0606).
- ✔ Engine Stalling or Misfiring: Your Trailblazer may stall unexpectedly while driving or at idle, and you might feel random engine misfires or hesitation during acceleration.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s gas mileage can be a sign the PCM is not managing the fuel mixture correctly.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can happen if the PCM is not properly signaling the fuel injectors or ignition system.
- ✔ Shifting Problems: The PCM also communicates with the transmission control module. A faulty PCM can lead to harsh shifting, getting stuck in gear, or other automatic transmission issues.
- ✔ Failed Emissions Test: Incorrect engine management from a failing PCM can easily cause your vehicle to fail a state emissions inspection.
The Simple, Reliable Solution
Replacing your PCM doesn’t have to be a complicated or costly process. Our service is designed to get you back on the road quickly and affordably. When you order from us, you’re getting a quality component that has been meticulously prepared for your specific vehicle. We flash it with the most current GM-released software, which can often resolve issues that were present even in the original factory programming. All we need is your VIN to make it happen.
This is a plug-and-play solution. In most cases, once you receive the module, the installation is as simple as disconnecting the battery, swapping the old module for the new one, and reconnecting the battery. No trip to the dealer for expensive programming is required. You may need to perform a security relearn procedure, which is a simple process that can be done in your driveway and we can provide instructions for.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and SUVs from this era. It is compatible with the following part numbers:
12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821
It will fit the following vehicles:
- 2006 Buick Rainier (4.2L)
- 2004-2006 Chevrolet Colorado
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2004-2006 GMC Canyon
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280
- 2006 Isuzu i-350
- 2006 Saab 9-7x (6-cylinder)
Frequently Asked Questions
Do I need to send my old PCM (core) back?
No core charge or return is required for this part. You can keep your old module or dispose of it responsibly.
Is this really a plug-and-play part?
Yes, for most vehicles. We program the module with your VIN, so it’s ready to be installed. Some vehicles may require a simple security relearn procedure (also known as a CASE relearn), which involves a series of key turns. We can provide instructions for this procedure.
Where do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for it to function in your vehicle.
What if my part number isn’t listed?
Please contact us with your vehicle’s year, make, model, and VIN. The listed part numbers are the most common, but there may be others. We can verify compatibility for you to ensure you get the right part.
Will this fix my vehicle’s problem for sure?
While this PCM will solve issues caused by a faulty module, it’s important to ensure your vehicle has been properly diagnosed. A PCM failure can mimic other problems, such as bad sensors or wiring. We recommend a thorough diagnosis by a qualified technician to confirm the PCM is the root cause of your issues.