End the Guesswork and Get Back on the Road with Confidence
Is your GMC Envoy XL feeling sluggish, unpredictable, or just not itself? A persistent check engine light, rough idling, or sudden stalling can turn any drive into a stressful ordeal. These aren’t just annoyances; they’re signs that your vehicle’s brain—the Powertrain Control Module (PCM)—may be failing. It’s time to stop worrying and restore the dependable performance you rely on. This module is the definitive solution, arriving at your doorstep fully programmed to your vehicle’s specific VIN with the latest GM software updates. It’s not just a replacement part; it’s a new lease on life for your engine.
Warning Signs and How to Overcome Them
If your vehicle is experiencing any of the following, a faulty PCM is a likely culprit. Replacing it can restore your vehicle’s health and your peace of mind.
- ✔ Unexplained Check Engine Light: Often with communication error codes like U0100 or internal fault codes such as P0601, P0606, or P060A.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or a significant drop in fuel economy.
- ✔ Erratic Shifting or Transmission Issues: The PCM controls transmission logic, so harsh shifts or getting stuck in gear can point to a module failure.
- ✔ Engine Stalling or No-Start Condition: The most frustrating symptom of all. A failing PCM can prevent the engine from starting or cause it to shut off unexpectedly.
- ✔ Intermittent Electrical Problems: Gauges behaving erratically or other strange electronic behavior can sometimes be traced back to the central computer.
From the Garage Bay: The Trailblazer That Wouldn’t Quit
I remember a customer, Mark, with a 2006 Trailblazer—a cousin to the Envoy. He’d been chasing a ghost for months. Multiple shops, new sensors, and hundreds of dollars later, his truck still stalled randomly at intersections. He was at his wit’s end, ready to sell it for scrap. We diagnosed a failing PCM. After installing one of our pre-programmed modules, the change was immediate. The engine purred, the power returned, and the stalling vanished. Mark called a week later, overjoyed. He’d just completed a 500-mile road trip without a single hiccup. It’s not just about fixing a part; it’s about restoring that feeling of trust in your vehicle.
Your Simple Path to a Smooth-Running Engine
You don’t need a professional lift or a complex set of tools for this job. With some basic hand tools and a bit of patience, you can get this done right in your driveway.
- Safety First: Always begin by disconnecting the negative terminal on your vehicle’s battery. This prevents any electrical shorts and protects both you and the vehicle’s electronics.
- Locate the Old Module: On your 2006 Envoy XL, the PCM is typically found in the engine bay, on the driver’s side, mounted near the firewall or inner fender. It’s a silver metal box with several large wiring harness connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location. Securely plug in the wiring harnesses, ensuring each connector clicks firmly into place.
- Reconnect and Verify: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure (often called a CASE relearn), which can typically be done with a simple key-on/key-off sequence or by a qualified technician with a scan tool. Start the engine and enjoy the renewed performance!
Guaranteed Compatibility for Your 2006 Envoy XL PCM
This module is a direct replacement for a wide range of part numbers and is confirmed to fit the following vehicles. We program it specifically for your VIN to ensure perfect function.
- 2006 Buick Rainier (4.2L)
- 2004-2006 Chevrolet Colorado
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2004-2006 GMC Canyon
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280 & i-350
- 2006 Saab 9-7x (6 cylinder)
This part directly replaces OEM 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 any programming myself?
No. We handle all the programming for you. Simply provide us with your vehicle’s VIN during checkout, and we will flash the module with the latest GM-certified software for your specific vehicle. It will be ready for installation upon arrival.
What is a security or CASE relearn?
After installation, your vehicle’s anti-theft system needs to sync with the new PCM. This is called a security relearn. Additionally, a Crankshaft Variation Relearn (CASE) may be needed to ensure the misfire detection system is accurate. Many vehicles will do this automatically, but some may require a simple key cycle procedure or a scan tool to complete.
Is this a used part?
This is a high-quality, OEM-sourced component that has been meticulously inspected, tested, and prepared to function as new. It is loaded with fresh, vehicle-specific software directly from the manufacturer’s database.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
What if I have issues after installation?
We stand behind our work. Our team of experienced technicians is here to help you through the process. If you encounter any issues, please contact us immediately for expert support and troubleshooting assistance.