Restore Your Envoy’s Peak Performance and Reliability
Is your 2006 GMC Envoy suffering from frustrating and unpredictable issues? A persistent check engine light, rough idling, poor fuel economy, or even a no-start condition can point directly to a failing Powertrain Control Module (PCM). This isn’t just an inconvenience; it’s a compromise on your vehicle’s safety and dependability. This module is the solution, arriving fully programmed to your vehicle’s specific VIN, ensuring a seamless and effective repair that brings back the smooth, confident drive you remember.
An Expert’s Note: The Ghost in the Machine
I once worked with a customer on a 2006 Trailblazer—the Envoy’s sibling—who had spent months and a small fortune chasing a random cylinder misfire. He’d replaced plugs, coils, and even injectors, but the problem persisted. The issue was a weak driver circuit inside the original PCM. It wasn’t failing completely, just intermittently, making it a nightmare to diagnose. Installing a correctly programmed replacement module didn’t just fix the misfire; it restored his faith in his vehicle. This part is often the key to solving those baffling electronic gremlins.
Warning Signs Your PCM is Failing
If you’re experiencing any of the following, a failing computer is the likely culprit. This replacement is designed to permanently solve these problems:
- ✔ Persistent Check Engine Light: Especially for codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Erratic Engine Behavior: Unexplained stalling, rough idling, hesitation during acceleration, or sudden power loss.
- ✔ Poor Fuel Economy: A faulty PCM can’t properly manage the engine’s fuel mixture, leading to wasted gas.
- ✔ Transmission Shifting Problems: Hard or delayed shifts can be caused by incorrect signals from the engine computer.
- ✔ Vehicle Won’t Start: The PCM controls the fuel and spark systems; if it fails, the engine may not start at all.
Your Direct 2006 Envoy PCM Replacement Solution
Forget the hassle and high cost of a dealership visit. We take the complexity out of the equation. By providing us with your vehicle’s VIN during checkout, our technicians will flash the module with the latest GM-certified software specific to your Envoy’s configuration. This ensures all systems—from the engine and transmission to the emissions equipment—function exactly as the factory intended. It’s a true plug-and-drive solution designed to get you back on the road quickly and confidently.
- Safety First: Begin by disconnecting the negative terminal on your vehicle’s battery to prevent any electrical shorts.
- Locate the Old Module: On your 2006 Envoy, the PCM is typically found in the engine bay, on the driver’s side, attached to the inner fender or firewall.
- Disconnect the Harnesses: Carefully unlatch and remove the electrical connectors from the old PCM. These connectors have locking tabs that need to be released before they can be pulled away.
- Swap the Units: Unbolt the old module from its mounting bracket. Secure your new, pre-programmed PCM in its place.
- Reconnect and Power Up: Firmly re-seat the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Security Relearn Procedure: After installation, you may need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. This allows the new PCM to sync with your vehicle’s anti-theft system.
Guided Installation to Restore Peace of Mind
Tailored Fit for Your Ride
This module is a guaranteed fit for the following vehicles and part numbers. It directly replaces: 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.
- 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
Do I need to provide my VIN?
Yes, providing your Vehicle Identification Number (VIN) is essential. We use it to load the precise, factory-correct software for your vehicle’s specific options and systems, ensuring a perfect match and seamless operation upon installation.
Is any additional programming needed after I install it?
In most cases, no dealer programming is required. However, you will likely need to perform a simple security relearn procedure (often called a ‘key-on’ relearn) which takes about 10-15 minutes. Some vehicles may also require a Crankshaft Variation Relearn (CASE relearn), which can be done with many professional-grade scan tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (like codes P0601, P0606, or other processor faults), then this part is the correct fix. It’s crucial to properly diagnose the cause of the light before ordering to ensure you’re addressing the root problem.
Where is the PCM located on my 2006 Envoy?
The Powertrain Control Module on a 2006 GMC Envoy with the 4.2L engine is located in the engine compartment, on the driver’s side, mounted near the firewall or inner fender well.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to a computer that only manages engine functions. A PCM (Powertrain Control Module) is more integrated and manages both the engine and the transmission, which is standard on most modern vehicles like your Envoy.