Restore Your Envoy’s Performance and Reliability
If you’re dealing with frustrating engine problems in your 2006 GMC Envoy, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty engine computer can cause everything from a simple Check Engine Light to a vehicle that won’t start at all. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. This replacement 2006 Envoy PCM is the definitive solution, arriving at your door pre-programmed with the latest GM software updates, tailored specifically to your vehicle’s VIN.
Forget about expensive dealership visits and the hassle of programming. We handle the complex part for you. Simply provide your VIN during checkout, and we’ll flash the module so it’s ready for a straightforward, plug-and-play installation. This restores factory performance, smooths out engine operation, and ensures all related systems are communicating correctly.
Case Study: A Tricky Diagnosis
I remember a 2006 Trailblazer—which shares the exact same platform and 4.2L engine as the Envoy—that came into my bay with a bizarre, intermittent no-start condition. The owner had already replaced the battery and starter. It would crank but wouldn’t fire, yet after sitting for an hour, it would start right up. There were no hard fault codes, only a stored U0100 (Lost Communication with ECM/PCM) code. After checking all the power and ground circuits to the PCM, we found that the module itself was failing internally when it got warm. Swapping in a pre-programmed PCM like this one solved the problem instantly. These intermittent issues are classic signs of a failing computer.
Is Your Envoy Showing These Symptoms?
- ✔ Check Engine Light is on with PCM-specific codes (e.g., P0601, P0602, P0606).
- ✔ Your vehicle fails to start or has an intermittent no-start condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or erratic engine idling and stalling.
- ✔ Harsh or incorrect shifting from the automatic transmission.
- ✔ Communication errors with scan tools or other modules (U-codes).
A Straightforward Guide to Installation
Replacing your 2006 Envoy PCM is a job most DIYers can handle in under an hour with basic tools. This module is typically located in the engine bay on the driver’s side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the 4.2L Envoy, find the PCM mounted to the driver’s side of the engine block.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held by a few bolts.
- Install the New PCM: Mount your new, pre-programmed PCM and securely plug in the wiring harness connectors. You should hear a click as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You may need to perform a simple security relearn. Turn the key to the ‘ON’ position for 10-15 minutes, then turn it off for 10 seconds. Repeat this two more times. The vehicle should then start and run correctly.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12569773 and other interchangeable numbers listed below. It is guaranteed to fit the following vehicles:
- 2006 Buick Rainier: 4.2L Engine
- 2004-2006 Chevrolet Colorado
- 2006 Chevrolet Trailblazer & Trailblazer EXT: 4.2L Engine
- 2004-2006 GMC Canyon
- 2006 GMC Envoy & Envoy XL: 4.2L Engine
- 2006 Hummer H3
- 2006 Isuzu Ascender: 4.2L Engine
- 2006 Isuzu i-280 & i-350
- 2006 Saab 9-7X: 6-Cylinder Engine (matches ID 12569773 or 12597521)
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
Frequently Asked Questions
Do I need to do anything after I buy this 2006 Envoy PCM?
Yes. After your purchase, you must send us your vehicle’s 17-digit VIN. We cannot ship the module until we have programmed it with your specific vehicle information.
Is any additional programming required once I install it?
No. This module comes fully programmed and ready for installation. In some cases, a simple key-cycle security relearn procedure (as outlined in our installation guide) is needed, but this does not require any special tools.
How do I know if this part number will fit my vehicle?
Our fitment list is comprehensive. As long as your vehicle’s make, model, year, and engine match our compatibility list, this module will work. It replaces a wide range of original part numbers.
What if my original part number isn’t 12569773?
That’s okay. This module is a direct replacement for all the part numbers listed in the description. As long as your old module’s number is on our list, this part is the correct fit for your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls engine performance and also communicates with the Transmission Control Module (TCM) to manage shift points. If the PCM is faulty, it can cause poor shifting, and a replacement will resolve this.