Restore Your Envoy’s Performance and Reliability
Is your 2006 GMC Envoy suffering from frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty computer keep you off the road. This direct-fit 2006 Envoy Powertrain Control Module is the definitive solution, arriving at your door pre-programmed to your vehicle’s specific VIN for a straightforward installation.
From the Diagnostic Bay
We had a 2006 Trailblazer (which uses the same platform as the Envoy) come into the shop with a persistent P0300 random misfire code. The owner had already spent a small fortune replacing spark plugs, coils, and even the fuel injectors, but the problem remained. After hooking up our professional scan tool, we noticed that the fuel trim and injector pulse width data were completely erratic, pointing away from the components and toward the controller. A quick check of the PCM’s power and ground circuits confirmed they were solid. The culprit was an internally failing PCM. We installed a VIN-programmed unit just like this one, performed the security relearn, and the truck ran perfectly. It’s a common story: chasing expensive parts when the vehicle’s brain was the real issue all along.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Rough or unstable idling.
- ✔ Engine stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass emissions testing.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
Why Choose Our 2006 Envoy Powertrain Control Module?
Getting your vehicle back to factory-spec performance shouldn’t be a hassle. That’s why we handle the most critical step for you. When you order, you provide us with your vehicle’s VIN. Our technicians then program the module with the latest GM-certified software specific to your Envoy. This means the unit that arrives is ready to be installed without requiring an expensive trip to the dealership for programming. It’s a true plug-and-play solution that saves you time and money.
Guaranteed Compatibility
This PCM is a direct replacement for a wide range of GM trucks and SUVs from the mid-2000s. It is guaranteed to be 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 fits a variety of models including the GMC Envoy & Envoy XL, Chevy Trailblazer & Trailblazer EXT, Chevy Colorado, GMC Canyon, Hummer H3, Buick Rainier, Isuzu Ascender, and Saab 9-7X. Please verify the fitment data to ensure it matches your specific vehicle and engine option.
The Installation Process
Replacing the 2006 Envoy Powertrain Control Module is a manageable task for a confident DIYer. After disconnecting the battery, you’ll locate the old module (typically on the driver’s side of the engine bay), disconnect the wiring harnesses, and unbolt it. Install the new module, reconnect the harnesses and battery, and you’re almost done. The final step for many vehicles is a simple security relearn procedure (often called a ‘key-on/key-off’ cycle), which can be done without any special tools and ensures the new PCM communicates with your vehicle’s anti-theft system. Instructions for this are readily available online or in service manuals.
Frequently Asked Questions
What does the Powertrain Control Module (PCM) do?
The PCM is the main computer for your vehicle. It controls all aspects of engine performance, including fuel injection, ignition timing, emissions systems, and it works with the Transmission Control Module (TCM) to manage shifting. A healthy PCM is essential for a smooth, efficient, and reliable vehicle.
Do I need to program this module?
No. This is the biggest benefit of our service. We program the module to the specific VIN you provide before we ship it. This ensures it has the correct software for your vehicle’s engine, transmission, and options, saving you a trip to the dealer and costly programming fees.
Will this fix my check engine light?
If the check engine light is on due to an internal fault within the PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the trouble codes. The PCM can store codes for other failing sensors or components. This module will only fix problems directly caused by a faulty PCM.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is straightforward. It involves disconnecting the battery, unplugging a few electrical connectors, and removing a few bolts. The most important step after installation is performing the security relearn procedure, which does not require special tools.
What is a security relearn procedure?
This is a simple sequence of turning the ignition key on and off for set periods. It allows your vehicle’s anti-theft system (like GM’s Passlock or Passkey) to recognize and sync with the new PCM. Without this step, the vehicle may not start. The procedure typically takes about 30 minutes to complete.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.