Bring your GMC Envoy XL back to life with a powertrain control module that’s built for reliability and engineered for a perfect fit. If you’re battling a persistent check engine light, erratic engine behavior, or frustrating transmission shifting problems, a failing PCM is often the hidden culprit. This isn’t just a replacement part; it’s a complete solution, arriving at your doorstep fully programmed with the latest GM software updates, specifically tailored to your vehicle’s unique VIN. Say goodbye to expensive dealership programming fees and complex diagnostic headaches. This is the straightforward, dependable fix that restores your vehicle’s performance and your peace of mind.
Warning Signs and How to Overcome Them
A vehicle’s PCM is its brain, and when it starts to falter, the symptoms can be confusing and widespread. Recognizing these signs early can save you from further complications and get you back on the road faster. If your SUV is exhibiting any of the following, it’s time to consider a PCM replacement:
- ✔ Illuminated Check Engine Light: Often accompanied by critical diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error), P0606 (PCM Processor Fault), or other communication errors.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or a significant drop in fuel economy.
- ✔ Intermittent Stalling: The engine may shut off unexpectedly while driving or idling, creating a dangerous situation.
- ✔ Harsh or Incorrect Shifting: Your transmission may shift erratically, get stuck in a gear, or feel clunky between shifts.
- ✔ Engine Misfires: The PCM controls spark and fuel delivery, and a fault can lead to persistent misfires that aren’t resolved by new spark plugs or coils.
- ✔ Complete No-Start Condition: In severe cases, a failed PCM can prevent the engine from starting at all, even with a good battery and starter.
From the Garage Bay: The Phantom Stall
We once worked with a customer whose 2006 Trailblazer had a maddeningly intermittent stalling issue. It would run perfectly for days, then suddenly die at a stoplight. Multiple shops had replaced sensors and fuel system components to no avail. The issue was a hairline crack on the PCM’s circuit board that would only cause a fault when the engine bay reached a specific temperature. Installing a pre-programmed PCM didn’t just fix the stall; it restored the owner’s trust in their vehicle for their family’s daily commute. It’s a powerful reminder of how this single component is the key to a dependable drive.
Guided Installation for Your 2006 Envoy XL PCM
Replacing your PCM is a manageable job that you can tackle with basic hand tools. Our pre-programmed module eliminates the most complicated step, allowing for a direct, plug-and-play process. Follow these steps for a confident installation:
- Safety First: Begin by disconnecting the negative terminal from 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, attached to the inner fender or firewall.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and gently pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the mounting brackets holding the old PCM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM in the same location, securing it with the original bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which is a simple process that can be found in your owner’s manual or online. Once complete, start the engine and enjoy your smooth-running vehicle!
Tailored Fit for Your Ride
This powertrain control module is a direct-fit replacement for a wide range of GM vehicles, ensuring seamless integration. Please verify your make, model, and engine size below. This unit is compatible with the following 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.
- 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)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because this module comes pre-programmed to your VIN, the complex part is done. However, you will likely need to perform a simple security relearn procedure (often called a CASE relearn or anti-theft relearn). This typically involves a sequence of key turns and waiting periods and does not require any special tools.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
Is this a used part?
This is a high-quality, inspected, and verified component that has been expertly prepared for service. Each unit is flashed with the latest official GM software to ensure optimal performance and longevity, providing a reliable alternative to a new dealership part.
Will this fix my check engine light?
If the check engine light is caused by an internal fault in your old PCM (like codes P0601 or P0606), then this part is the correct solution. It’s always best to have your vehicle properly diagnosed to ensure the PCM is the root cause of the issue before ordering.
What if my part number is not on the list?
The part numbers listed are the most common compatible units. If your original module’s part number is not on the list but your vehicle is, please contact us with your VIN. We can verify compatibility and ensure you get the correct component for your application.