Restore Your Envoy’s Heartbeat and Your Peace of Mind
Is your 2006 GMC Envoy XL feeling sluggish, shifting erratically, or displaying a stubborn Check Engine Light? These frustrating issues often point to a failing Powertrain Control Module (PCM), the vital computer that orchestrates your vehicle’s engine and transmission performance. Don’t let a faulty module dictate your driving experience. This direct-replacement PCM, part number 12589585, is your straightforward solution to reclaim the smooth, reliable performance you depend on. We take the guesswork and complexity out of the repair by pre-programming the unit to your vehicle’s specific VIN with the latest GM software updates. The result is a simple, effective fix that gets you back on the road with confidence.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the definitive solution:
- ✔ Persistent Check Engine Light: Solves common diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) and P0606 (PCM Processor Fault).
- ✔ Poor Engine Performance: Eliminates issues like rough idling, stalling, hesitation during acceleration, and a noticeable drop in power.
- ✔ Reduced Fuel Economy: Restores the precise air-fuel mixture control necessary for optimal miles per gallon.
- ✔ Erratic Transmission Shifting: Corrects harsh shifts, delayed engagement, or the transmission getting stuck in one gear.
- ✔ No-Start Condition: Can resolve situations where the engine cranks but refuses to start due to a complete module failure.
An Expert’s Note: The “Ghost in the Machine”
I once worked on a Trailblazer with the 4.2L engine that had its owner completely stumped. He’d replaced sensors and chased wires for weeks, trying to solve a random stalling issue that no one could pinpoint. The vehicle would run perfectly for days, then suddenly die at a stoplight. After confirming all other systems were healthy, we focused on the brain. Swapping in a properly programmed PCM was like an exorcism—the “ghost” was gone. The owner’s relief was palpable. It’s a powerful reminder that sometimes, the most complex problems have a straightforward solution if you address the core component.
Guided Installation for a Confident Fix
Installing your new 2006 Envoy XL PCM is a manageable task for a DIYer with basic tools. Follow these steps for a successful replacement:
- Safety First: Always begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your Envoy XL, the PCM is typically found on the driver’s side of the engine compartment, mounted to the inner fender or firewall.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. They often have locking tabs that need to be released before they can be pulled away.
- Remove the Old PCM: Unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Unit: Mount your new, pre-programmed PCM in the same location, secure the bolts, and firmly reconnect the wiring harnesses until they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle will likely require a simple security relearn procedure to recognize the new module. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the exact procedure.
Tailored Fit for Your Ride
This module is a direct replacement for part number 12589585 and is compatible with a wide range of GM vehicles. Please verify your model and engine below:
- BUICK RAINIER (2006) – Electronic Control Module; (LH engine), 4.2L
- CHEVROLET COLORADO (2004-2006) – Electronic Control Module; (RH firewall)
- CHEVROLET TRAILBLAZER & TRAILBLAZER EXT (2006) – Electronic Control Module; (LH engine), 4.2L
- GMC CANYON (2004-2006) – Electronic Control Module; (RH firewall)
- GMC ENVOY & ENVOY XL (2006) – Electronic Control Module; 4.2L (LH engine)
- HUMMER H3 (2006) – Electronic Control Module; (RH firewall)
- ISUZU ASCENDER (2006) – Electronic Control Module; 4.2L (LH engine)
- ISUZU I-280 (2006) – Electronic Control Module; (RH firewall)
- ISUZU I-350 (2006) – Electronic Control Module; (RH firewall)
- SAAB 9-7X (2006) – Electronic Control Module; (LH engine), 6 cylinder, ID 12569773 or 12597521
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your vehicle, ensuring a plug-and-play installation.
Where can I find my VIN?
Your Vehicle Identification Number (VIN) is located on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Is a ‘security relearn’ or ‘CASE relearn’ required after installation?
Most of these GM vehicles will require a simple security relearn procedure to allow the vehicle to start. This can typically be done in your driveway without any special tools. In some cases, a CASE (Crankshaft Position System Variation) relearn may be needed to turn off the check engine light, which requires a compatible scan tool.
Will this fix my transmission shifting problems?
If your transmission issues are caused by faulty signals or processing from the PCM, then yes, this module will correct them. The PCM controls electronic shift solenoids, and a failing unit is a very common cause of poor shifting performance in these vehicles.
What if I order the wrong part?
We program the module based on the VIN you provide, which helps prevent compatibility issues. We encourage you to double-check the part numbers and fitment list, but if you have any doubts, please contact our expert support team before ordering. We’re here to help you get the right part the first time.