Is Your 2006 Envoy Experiencing Baffling Electrical Problems?
As a technician with over two decades of experience, I’ve seen it all when it comes to the GM GMT360 platform, which includes your 2006 GMC Envoy. If you’re dealing with a frustrating no-start condition, intermittent stalling, a check engine light that throws a dozen unrelated codes, or a transmission that shifts harshly for no reason, the root cause is often the one component you can’t easily test: the Powertrain Control Module (PCM).
The PCM is the brain of your vehicle, managing everything from fuel injection and spark timing to transmission shift points. When it starts to fail, the symptoms can seem random and impossible to diagnose, leading many owners and even some shops down expensive rabbit holes of replacing perfectly good sensors and parts.
The Real-World Diagnosis of a Failing PCM
A customer’s 2006 Trailblazer came into my shop last month with these exact symptoms. It would run fine for a week, then refuse to start for a day. The dashboard was lit up with codes for the O2 sensors, throttle body, and even a transmission solenoid. My scan tool would intermittently lose communication with the PCM. After verifying the wiring harness and grounds were solid—a critical first step—it was clear the PCM itself was internally faulty. Heat, vibration, and age had taken their toll on the delicate circuit board.
The Direct, Reliable Solution: A VIN-Programmed PCM
This isn’t a part you can just pull from a junkyard and plug in. Modern vehicles like your Envoy have sophisticated anti-theft systems (GM’s Passlock/VATS) that are tied directly to your vehicle’s unique Vehicle Identification Number (VIN). This PCM is the correct, hassle-free solution because we handle the most critical step for you.
- Pre-Programmed to Your VIN: Simply provide us with your Envoy’s VIN during checkout, and we will flash the module with the latest GM-certified software specifically for your vehicle’s configuration. This ensures all systems communicate correctly.
- Eliminates Guesswork: Stop throwing money at sensors. A failing PCM is a common issue on these 4.2L engines, and this replacement directly addresses the core problem.
- Plug-and-Play Installation: Once you receive the module, the physical installation is straightforward. After swapping the part, you will need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes, three consecutive times. No expensive dealer tools required.
Guaranteed Compatibility for Your Vehicle
This Powertrain Control Module is a direct replacement for service number 12569773 and is guaranteed to fit a wide range of GM vehicles from that era. Please verify your part number or match your vehicle in the list below to ensure proper fitment.
This module is a confirmed fit for the following vehicles:
- 2006 GMC Envoy (4.2L)
- 2006 GMC Envoy XL (4.2L)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2006 Buick Rainier (4.2L)
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280 & i-350
- 2006 Saab 9-7x (6-cylinder)
It also replaces a wide range of alternative part numbers, including: 12588650, 12591647, 12597521, 12606369, and more. Restore your Envoy’s proper function and get back on the road with confidence.