Is your GMC Envoy feeling sluggish, unpredictable, or just not itself? The Powertrain Control Module (PCM) is the central command center for your engine and transmission, and when it falters, it can cause a cascade of frustrating issues. This isn’t just about a check engine light; it’s about the confidence you have in your vehicle every time you turn the key. Our professionally programmed PCM is the definitive solution, designed to restore the smooth performance and unwavering reliability you depend on.
We take the complexity out of the repair. Simply provide your vehicle’s VIN during checkout, and our technicians will flash this module with the latest, most stable GM software specific to your Envoy. It arrives at your door ready to install, eliminating the need for expensive dealership programming or specialized tools. Get ready to rediscover a responsive throttle, smooth shifting, and the peace of mind that comes from a solid, dependable repair.
An Expert’s Note: The Ghost in the Machine
I once had a customer with a 2006 Trailblazer—a cousin to your Envoy—that had been to three different shops. It had bizarre, intermittent stalling issues that no one could pinpoint. After swapping sensors and checking wiring harnesses for weeks, we finally traced it to a failing PCM. The moment we installed a VIN-programmed unit like this one, the vehicle came back to life. It wasn’t just a fix; it was a restoration. The owner went from being ready to sell the truck for scrap to planning his next family road trip. That’s the power of getting the vehicle’s ‘brain’ right.
Warning Signs Your PCM is Failing
- âś” A persistent Check Engine Light that won’t go away, especially with codes like P0601, P0602, or P0606.
- âś” Unexplained stalling or rough, erratic idling.
- âś” Noticeable loss of engine power and poor acceleration.
- âś” Decreased fuel efficiency that costs you money at the pump.
- âś” Harsh or delayed transmission shifting.
- âś” Failure to pass state emissions inspections.
- âś” The engine cranks but refuses to start.
Guided Installation for Your 2006 Envoy PCM
Replacing your PCM is a straightforward job you can tackle with basic hand tools. Follow these steps for a confident installation.
- Safety First: Begin by disconnecting the negative terminal on your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your 2006 Envoy, the PCM is typically found in the engine bay, mounted on the driver’s side (LH) near the firewall or inner fender.
- Disconnect the Harnesses: Carefully unplug the large electrical connectors from the old PCM. There are usually release tabs or levers; be gentle to avoid damaging them.
- Remove the Old Unit: Unbolt the old module from its mounting bracket and set it aside.
- Install the New PCM: Mount your new, pre-programmed PCM securely onto the bracket.
- Reconnect and Secure: Plug the electrical harnesses back into the new module. You should hear and feel a solid ‘click’ as they lock into place.
- Power Up: Reconnect the negative battery terminal and tighten it securely.
- Final Steps: In some cases, a security relearn procedure may be needed. This simple process, often called a ‘key cycle,’ syncs the new PCM with your vehicle’s anti-theft system. Instructions are readily available online or in your owner’s manual.
Tailored Fit for Your Ride
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your make, model, and engine to ensure perfect compatibility.
- Buick Rainier: 2006 (4.2L)
- Chevrolet Colorado: 2004-2006
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- GMC Canyon: 2004-2006
- GMC Envoy, Envoy XL: 2006 (4.2L)
- Hummer H3: 2006
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280: 2006
- Isuzu i-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
This unit replaces 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.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module arrives fully programmed to your vehicle’s specific VIN with the latest GM updates. It is a plug-and-play solution, though a simple security relearn procedure may be required after installation.
Where is the PCM located on my 2006 Envoy?
The PCM is typically located in the engine compartment on the driver’s side (LH side), near the firewall or attached to the inner fender well.
How do I provide my VIN?
You can enter your Vehicle Identification Number (VIN) during the checkout process. This is crucial for us to program the module correctly for your specific vehicle.
What if my part number isn’t listed?
The part numbers listed are the most common ones this module replaces. If you are unsure, please contact us with your VIN, and our team of experts will verify compatibility for you.
Is this a guaranteed fix for my vehicle’s problems?
While a faulty PCM is the cause of many common engine performance issues, proper vehicle diagnosis is key. This part will resolve any problems directly caused by a failing PCM. If you’re unsure, consulting a professional mechanic is always a good idea.