Is your 2006 GMC Envoy XL feeling unpredictable? Stalling at intersections, shifting erratically, or displaying a stubborn Check Engine Light can turn every drive into a source of stress. The Powertrain Control Module (PCM) is the operational brain of your vehicle, and when it falters, the symptoms can be confusing and frustrating. This is your direct, reliable solution to restore order and bring back the smooth, dependable performance you rely on.
We provide a meticulously prepared PCM, flashed with the latest GM software updates and specifically programmed to your vehicle’s unique VIN. This critical step ensures seamless communication between all your vehicle’s systems, just as the factory intended. Forget about expensive dealership visits for programming or the uncertainty of a junkyard part. This module arrives at your doorstep ready for a straightforward installation, empowering you to take control of the repair and get back on the road with confidence.
Warning Signs and How to Overcome Them
A failing PCM can mimic a wide range of other issues. If you’re experiencing any of the following, this module is the likely solution to put these problems behind you for good:
- ✔ Persistent Check Engine Light: Especially with Diagnostic Trouble Codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Erratic Engine Behavior: Unexplained stalling, rough idling, hesitation during acceleration, or a sudden drop in power.
- ✔ Poor Fuel Economy: A noticeable and sudden decrease in your vehicle’s MPG as the engine struggles with incorrect fuel and air mixtures.
- ✔ Harsh or Incorrect Shifting: The transmission may shift hard, late, or not at all, as it’s not receiving the correct signals from the PCM.
- ✔ No-Start Condition: In severe cases, the vehicle may crank but refuse to start because the PCM isn’t managing the ignition or fuel systems properly.
- ✔ Communication Errors: Your diagnostic scan tool may be unable to communicate with the PCM, indicating a total failure.
Guided Installation to Restore Peace of Mind
You don’t need to be a master mechanic to complete this repair. Our VIN-programming service handles the complex part, leaving you with a simple component swap. Here’s how you can get it done:
- 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 XL, the PCM is typically found in the engine bay, on the driver’s side (LH engine). It’s a metal box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses from the old module. They have locking tabs that need to be released. Once disconnected, unbolt the old PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location. Securely plug in the wiring harnesses, ensuring they click into place. A firm connection is vital.
- Reconnect and Start: Reconnect the negative battery terminal. Your vehicle may require a security relearn procedure, which often involves turning the key to the ‘ON’ position for 10-15 minutes before starting. This allows the vehicle’s systems to recognize the new module.
A Mechanic’s Story: The Ghost in the Machine
A customer brought in a 2006 Trailblazer (a sibling to the Envoy) that was driving him crazy. He’d replaced O2 sensors, the mass airflow sensor, and even the throttle body chasing a rough idle and stalling issue. His scanner gave him a dozen different codes that seemed to change every week. He was about to give up. We suspected the source wasn’t a sensor, but the computer interpreting the data. After installing a properly programmed PCM, every single issue vanished. The engine idled smoothly, the transmission shifted perfectly, and the check engine light stayed off. It’s a powerful reminder that sometimes, the problem isn’t the components, but the conductor of the orchestra—the PCM itself.
Tailored Fit for Your Ride
This Programmed 2006 Envoy XL PCM is a direct-fit replacement for a wide range of GM vehicles and part numbers. Please verify your model and part number below to ensure a perfect match.
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
Fits:
- 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
What does “VIN Programmed” mean?
It means we flash the module with the specific software and settings for your exact vehicle using the Vehicle Identification Number (VIN) you provide. This ensures it works correctly with your engine, transmission, and options, making the installation plug-and-play without needing a trip to the dealer.
Do I need to do anything after I install it?
In most cases, you will need to perform a security relearn procedure, also known as a CASE relearn. This is a simple process that typically involves turning the key to the ‘on’ position for 10-15 minutes. This allows the anti-theft system to synchronize with the new PCM. Instructions are included with your order.
Is this a new or used part?
This is a professionally prepared original equipment (OE) unit. Each module undergoes a thorough inspection and testing process to ensure it meets or exceeds factory specifications for performance and reliability before being programmed for your vehicle.
Will this fix my transmission shifting problems?
Yes, in many cases it will. The PCM controls transmission shift points, line pressure, and torque converter lockup. If the PCM is faulty, it can cause a wide variety of shifting issues, and replacing it with our Programmed 2006 Envoy XL PCM is often the correct solution.
What is your warranty policy?
We stand behind our work with a comprehensive warranty. Please see the warranty tab on this page for full details, but rest assured that you are protected against defects in our programming and the module itself.