End the Frustration and Restore Your Vehicle’s Brain
Is your ride suffering from baffling electrical gremlins, poor performance, or a persistent check engine light? A failing Powertrain Control Module (PCM) can feel like a mysterious, expensive problem, turning your dependable vehicle into a source of constant worry. This unit is the definitive solution, arriving at your doorstep fully programmed with the latest GM software updates specifically for your vehicle. We take the guesswork out of the repair, using your VIN to ensure this module is a perfect match, restoring communication between your engine and transmission and getting you back on the road with confidence.
Warning Signs and How to Overcome Them
If you’re noticing any of these symptoms, a faulty module could be the culprit. Replacing it with our pre-programmed unit can restore your vehicle’s health and your peace of mind.
- ✔ Check Engine Light: A constant CEL, especially with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0605, or P0606.
- ✔ Erratic Shifting: Harsh, delayed, or unpredictable gear changes that make driving uncomfortable and unsafe.
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel or spark commands from the PCM.
- ✔ Poor Fuel Economy: A sudden drop in MPG as the engine’s air-fuel mixture is no longer being managed efficiently.
- ✔ Stalling or Misfiring: The engine may stall unexpectedly or run rough, indicating the PCM is failing to properly control ignition timing or fuel injectors.
- ✔ Failed Emissions Test: Inability to pass smog or emissions testing is a common indicator of a malfunctioning engine computer.
Guided Installation to Restore Peak Performance
Installing your new 2006 Envoy XL PCM is a straightforward process that you can tackle with basic hand tools. Follow these steps for a successful repair.
- Safety First: Disconnect the Battery. Before you begin, always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM. On most of these vehicles, the PCM is found in the engine bay, typically on the driver’s side near the firewall or inner fender.
- Disconnect the Wiring Harnesses. Carefully unclip and remove the electrical connectors from the old module. These connectors have locking tabs, so be gentle to avoid damage.
- Remove the Old Module. Unbolt the old PCM from its mounting bracket. It’s usually held in place by a few small bolts or nuts.
- Install the New Module. Mount your new, pre-programmed PCM onto the bracket and secure it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery. Reattach the negative battery terminal. The vehicle may need to perform a security relearn procedure, which typically involves cycling the key. Consult your owner’s manual for specific instructions if needed.
Tailored Fit for Your Ride
This module is a direct-fit replacement for a wide range of GM vehicles, ensuring seamless integration. Please verify your make, model, and year from the list below.
- 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.
Your Questions Answered
How do I provide my VIN number?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your module until we receive this information, as it is essential for programming.
Is this module truly plug-and-play?
Yes, for most vehicles. Because we program it to your VIN, it will integrate with your vehicle’s systems. In some cases, a simple security relearn procedure (often called a CASE relearn) may be required, which can be done without special tools.
What is a PCM and why is it so important?
The Powertrain Control Module, or PCM, is your vehicle’s main computer. It controls everything from engine timing and fuel delivery to transmission shifting and emissions systems. A healthy PCM is critical for a smooth, safe, and efficient ride.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old PCM (verified by codes like P0601-P0606), then this new module will resolve the issue. It’s always best to have a proper diagnosis to confirm the PCM is the root cause of your problem.
What happens if I don’t replace a failing PCM?
Ignoring a failing PCM can lead to more severe problems, including catalytic converter damage from an incorrect air/fuel mixture, transmission damage from harsh shifting, or leaving you stranded with a no-start condition. Addressing it promptly saves you money and stress.