Restore Your Envoy’s Performance and Reliability
Is your 2006 GMC Envoy XL acting up? Experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as the brain for your engine and transmission. When it falters, your vehicle’s performance suffers. This isn’t just an annoyance; it’s a problem that can leave you stranded. We offer a dependable and straightforward solution: a replacement PCM, programmed specifically for your vehicle.
Forget the hassle and expense of a dealership visit. We flash this module with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures perfect compatibility and optimal performance right out of the box. This is the most efficient way to get your Envoy XL running smoothly again, restoring its power, shifting, and fuel efficiency to factory standards.
A Technician’s Notebook
I remember a 2006 Trailblazer—which shares this exact platform with the Envoy XL—that came into my bay with a bizarre, intermittent no-start condition. The owner had already replaced the battery and starter. The scan tool would sometimes communicate and other times throw a U0100 (Lost Communication with ECM/PCM) code. After checking the wiring harness and grounds, we focused on the PCM itself. Heat soak was causing an internal failure. Instead of towing it to a dealer for a costly replacement and programming session, we sourced a VIN-programmed module like this one. The swap took less than 30 minutes, a simple security relearn followed, and the truck fired up every single time. It’s a textbook fix for these symptoms.
Is Your Envoy Exhibiting These PCM Failure Signs?
A failing computer can cause a wide range of symptoms. If you’re noticing any of the following, a faulty PCM is a very likely culprit:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100
- ✔ Engine cranks but refuses to start
- ✔ Unexplained stalling or rough running, especially when warm
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel mileage
- ✔ Other warning lights (ABS, Security) illuminating randomly
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your new 2006 Envoy XL Powertrain Control Module is a job most DIYers can handle with basic tools. Follow these steps for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the 2006 Envoy XL with the 4.2L engine, the PCM is located on the driver’s side of the engine bay, mounted to the engine block itself.
- Disconnect the Connectors: Carefully release the locking tabs and unplug the electrical wiring harnesses from the old module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New PCM: Mount your new, pre-programmed module onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the wiring harnesses firmly back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple key-on/key-off security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the vehicle’s anti-theft system to recognize the new module.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. We guarantee compatibility if your vehicle is on this list and you provide your VIN for programming. This unit is an exact replacement for part numbers including 12597521, 12589311, 12606373, and 19209820.
- 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 program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and it will arrive ready to install with the latest GM software.
What is a ‘security relearn’ and is it difficult?
A security relearn syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that does not require special tools. It typically involves a 30-minute key-on/key-off sequence that you can easily do in your driveway. We can provide instructions if needed.
Where is the PCM located on my 2006 Envoy XL?
For the 2006 Envoy XL with the 4.2L inline-6 engine, the PCM is mounted on the driver’s side (LH) of the engine itself.
How do I give you my VIN?
You can add your VIN to the notes section during checkout. If you forget, don’t worry—we will contact you via email after your purchase to request it before we program and ship your part.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (common codes P0601-P0606) or related communication errors, then yes, this new module will resolve the issue once installed correctly.