Bring Your GMC Envoy Back to Peak Performance
Is your 2006 GMC Envoy suffering from frustrating and unpredictable issues? A flickering check engine light, rough idling, stalling at intersections, or abysmal fuel economy can turn a reliable SUV into a source of constant worry. These aren’t just annoyances; they’re classic signs that the brain of your vehicle, the Powertrain Control Module (PCM), is failing. It’s time to stop guessing and start fixing. This replacement PCM, part number 12589585, is the definitive solution to restore your vehicle’s health and your peace of mind.
We take the complexity out of the repair. Unlike a generic module from a parts store, this unit arrives at your doorstep fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures all factory settings, engine parameters, and transmission strategies are perfectly matched to your Envoy, just as it came from the factory. This means no expensive trips to the dealership for programming—just a straightforward installation to get you back on the road with confidence.
Is Your Vehicle Showing These Warning Signs?
- ✔ Check Engine Light: Persistent illumination, especially with codes like P0601, P0602, P0606, or other communication errors.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, or a general feeling that your engine is struggling.
- ✔ Erratic Shifting: The transmission may shift harshly, at the wrong times, or seem to get ‘stuck’ in a gear.
- ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the fuel-to-air ratio, leading to more stops at the pump.
- ✔ Stalling or No-Start: The engine may stall unexpectedly while driving or refuse to start at all, leaving you stranded.
- ✔ Communication Issues: Your mechanic’s scan tool may be unable to communicate with the engine computer.
Guided Installation for a Confident Fix
Replacing your 2006 Envoy PCM is a manageable job for a DIYer with basic tools. Follow these steps for a smooth installation and feel the satisfaction of fixing it yourself.
- Safety First: Begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your 2006 Envoy (and similar Trailblazer/Rainier models), the PCM is typically located on the driver’s side of the engine bay, near the firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are usually locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new module. This often involves cycling the key in the ignition and can be done without special tools. Instructions are readily available online or in your service manual.
An Expert’s Note: The Power of a Pre-Programmed Part
“I once had a customer with a 2006 Trailblazer, nearly identical to the Envoy, who was at his wit’s end. The dealership quoted him over a thousand dollars for a new computer and the labor to program it. His SUV was stalling randomly, making it unsafe for his family. He was skeptical about doing the job himself, but we sent him this exact pre-programmed module. An hour after it arrived, he called me, ecstatic. The installation was simple, the vehicle started right up, and the check engine light was finally off. He didn’t just save money; he regained the confidence that his family was safe on the road. That’s the real value here.”
Tailored Fit for Your Ride
This module is a direct replacement for part number 12589585 and is compatible with a wide range of GM vehicles. Please verify your model and engine below:
- BUICK RAINIER (2006) – 4.2L Engine
- CHEVROLET COLORADO (2004-2006)
- CHEVROLET TRAILBLAZER & TRAILBLAZER EXT (2006) – 4.2L Engine
- GMC CANYON (2004-2006)
- GMC ENVOY & ENVOY XL (2006) – 4.2L Engine
- HUMMER H3 (2006)
- ISUZU ASCENDER (2006) – 4.2L Engine
- ISUZU I-280 (2006)
- ISUZU I-350 (2006)
- SAAB 9-7X (2006) – 6 Cylinder Engine
Note: This unit replaces numerous part numbers, including 12569773, 12588650, 12591647, 12597521, and more.
Your Questions Answered
Do I need to do any programming myself?
No. We handle all the programming before we ship the module. We use the VIN you provide to load the latest GM-certified software specific to your vehicle, ensuring it works correctly right out of the box.
What is a security relearn or CASE relearn?
After installing the new PCM, your vehicle’s anti-theft system needs to sync with it. This is a simple ‘relearn’ procedure that usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. A CASE (Crankshaft Angle Sensor Error) relearn may be needed with a scan tool to optimize performance, but the vehicle will run without it.
Is this a used part?
This is a high-quality, inspected, and verified component sourced from original equipment. Each unit is thoroughly tested to ensure it meets or exceeds factory specifications before being programmed and shipped.
What information do you need from me?
After placing your order, you MUST provide us with your vehicle’s 17-digit VIN. This is crucial for us to program the module correctly. Without the VIN, we cannot process your order.
What if I install it and still have problems?
While this 2006 Envoy PCM resolves the vast majority of electronic issues, it’s important to ensure the root cause isn’t a different component (like a bad sensor or wiring). Our modules are backed by a warranty, and our expert support team is here to help you troubleshoot if any issues arise.