Is Your Truck Experiencing These Common Failure Symptoms?
The Powertrain Control Module, or PCM, is the central brain of your vehicle’s engine and transmission. When it begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. If you’re noticing any of the following issues with your GMC Envoy, Trailblazer, Rainier, or other compatible vehicle, a failing engine computer could be the culprit.
- ✔ Persistent Check Engine Light: The check engine light (CEL) stays on, often with communication error codes (U-codes) or multiple random sensor codes.
- ✔ Poor Engine Performance: You may experience a noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: A faulty PCM can’t properly manage the air-fuel mixture, leading to a sudden and unexplained drop in your MPG.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode).
- ✔ Engine Stalling or No-Start: The most severe symptom is the engine stalling intermittently while driving or failing to start at all, even with a good battery and starter.
- ✔ Communication Issues with Scan Tools: Your mechanic may be unable to communicate with the PCM using a diagnostic scan tool, pointing directly to a module failure.
From the Diagnostic Bay
A customer brought in their 2006 Trailblazer with the 4.2L engine, complaining of a rough idle and a P0300 (Random Misfire) code that just wouldn’t go away. They had already replaced all the spark plugs, ignition coils, and even the camshaft position sensor based on advice from forums. The problem persisted. When we hooked up our scope, we noticed the injector pulse width was erratic on multiple cylinders. Instead of chasing more sensors, we checked the PCM’s driver circuits and found they were failing under load. We installed a correctly programmed PCM, performed the required security relearn, and the engine immediately smoothed out. The customer had spent hundreds on parts they didn’t need when the core issue was the computer itself. This is a classic case where diagnosing the brain, not just the symptoms, saves time and money.
The Direct Solution: A Plug-and-Play PCM
Stop chasing ghosts in the machine and replace the core component. This Powertrain Control Module (part number 12606374) is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and complexity out of the repair by programming the module specifically for your vehicle using the VIN you provide. This means it arrives at your door with the latest GM-certified software already loaded, ready for a straightforward installation.
Why Choose Our Pre-Programmed 2006 Envoy PCM?
When you purchase from us, you’re not just getting a part; you’re getting a complete solution. Our process ensures a seamless repair experience.
- VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring all factory options and parameters are correctly configured. This is not a generic, one-size-fits-all product.
- Latest GM Software Updates: Your module will be loaded with the most recent software updates from General Motors. These updates often address factory bugs, improve transmission shifting, and enhance overall engine efficiency.
- Simple Installation: Because the unit is pre-programmed, the installation process is significantly simplified. In most cases, you will only need to perform a security relearn procedure, which can often be done without a specialized scan tool.
- Guaranteed Compatibility: This module is a direct replacement for a wide range of original equipment part numbers, ensuring a perfect fit and function.
Guaranteed Fitment and Compatibility
This Electronic Control Module is a direct replacement for 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 is verified to 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
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. You can typically add it as a note during checkout or reply to your order confirmation email. We cannot ship the module until we have this information.
Is this a plug-and-play installation?
For the most part, yes. The module arrives with the correct engine and transmission software for your vehicle. However, on most GM vehicles of this era, you will need to perform a security relearn procedure (also known as a Passlock or anti-theft relearn) to sync the new PCM with your vehicle’s keys. This procedure typically takes about 30 minutes and can be done without any special tools.
Will I need to have a dealer program this?
No. The main programming is already completed by us before shipment. This saves you the time and expense of a trip to the dealership. The only remaining step is the security relearn, which you or your mechanic can perform.
What if my original part number is not on your list?
Please contact us with your vehicle’s VIN and the part number from your original module. GM often supersedes part numbers, and we can verify if this module is the correct, updated replacement for your specific application.
Is this the same as an ECM or an ECU?
Yes. The terms Powertrain Control Module (PCM), Engine Control Module (ECM), and Engine Control Unit (ECU) are often used interchangeably. For this specific vehicle platform, the module controls both the engine and the transmission, so PCM is the most accurate term.