Restore Peak Performance to Your GM Truck or SUV
Is your 2006 Chevrolet Trailblazer, GMC Envoy, or other compatible GM vehicle suffering from perplexing electrical issues, poor fuel economy, or a persistent Check Engine Light? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing your engine’s performance, fuel delivery, and transmission shifting. When it fails, it can cause a wide range of frustrating problems that can be difficult to diagnose. This replacement PCM, part number 12593531, is the definitive solution to get your vehicle running smoothly and reliably again.
We take the guesswork out of the repair process. Unlike a generic module from a parts store or salvage yard, this unit is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the correct software and calibrations for your engine, transmission, and factory options. It’s a true plug-and-play solution designed for a straightforward installation, getting you back on the road with confidence.
From the Diagnostic Bay
We had a 2006 GMC Envoy with the 4.2L engine come in with a classic case of “we’ve replaced everything.” The owner had already replaced the spark plugs, ignition coils, and even the throttle body chasing an intermittent stalling issue and a P0601 (Internal Control Module Memory Check Sum Error) code. The code would clear but always return within a day. After confirming power and grounds to the module were solid, we knew the original PCM was the culprit. Swapping in a VIN-programmed module like this one solved the problem instantly. The engine idled perfectly, the code was gone for good, and the customer was thrilled to have their reliable daily driver back. It’s a perfect example of how a faulty PCM can mimic other component failures, making a direct-fit, programmed replacement the most efficient repair.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The most common indicator, often with communication-related or internal processor fault codes (e.g., P0601, P0606).
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the PCM fails to correctly control ignition timing or fuel injection.
- ✔ No-Start Condition: Your vehicle may crank but refuse to start because the PCM is not activating the fuel pump or ignition system.
- ✔ Poor Fuel Economy: Incorrect air/fuel mixture calculations can lead to a noticeable drop in MPG.
- ✔ Harsh or Erratic Shifting: The PCM also controls transmission functions, and a failure can result in delayed, hard, or incorrect gear changes.
- ✔ Failure to Communicate: A diagnostic scan tool may be unable to connect with the PCM, indicating a major internal failure.
Your Solution: A VIN-Programmed 2006 Trailblazer PCM
Don’t let a faulty computer keep your truck off the road. This module is a direct replacement for a wide range of GM vehicles, including the Chevy Trailblazer, GMC Envoy, Hummer H3, and Isuzu Ascender equipped with the 4.2L inline-six engine, as well as Colorado and Canyon models. By providing us with your VIN during checkout, you ensure that the module you receive is loaded with the latest GM-certified software for your exact vehicle configuration. This eliminates the need for expensive dealership programming and complex setup procedures.
This unit is a direct replacement for numerous original part numbers, including: 12569773, 12588650, 12589311, 12593531, 12597521, 12604438, and many more. Please verify your part number or consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you place your order, and the module will arrive ready to be installed. It’s a plug-and-play solution.
What is the security relearn procedure?
After installation, you will likely need to perform a simple security relearn procedure, also known as the Passlock or anti-theft relearn. This process syncs the new PCM with your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle two more times. Instructions are readily available online for your specific model and are easy to follow.
Is this compatible with my 2006 Hummer H3?
Yes, this electronic control module is listed as a compatible part for the 2006 Hummer H3. It is also compatible with a wide range of other GM models from 2004-2006, including the Colorado, Canyon, Rainier, and Envoy. Always check the fitment list to be certain.
How do I provide my VIN?
You can add your 17-digit VIN in the notes section during checkout or send it to us in a message after you complete your purchase. We cannot program and ship your module without this information.
What if my original part number isn’t 12593531?
This module is a replacement for a large number of interchangeable GM part numbers. Please review the comprehensive list of compatible part numbers in the description. If your part number is on that list, this module will work for your vehicle once programmed to your VIN.