Is Your Envoy or Trailblazer Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic shifting, stalling, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. Your vehicle’s computer is its brain, and when it starts to fail, it can cause a host of problems that make your reliable truck feel unpredictable. This isn’t just an inconvenience; it’s a matter of dependability. Get your truck back to starting every time and running smoothly with this direct-fit, professionally programmed engine computer, specifically for models like your 2006 GMC Envoy PCM 12569773.
Common Symptoms of a Failing GM PCM & Your Solution
A faulty PCM can manifest in many ways. You might be seeing diagnostic trouble codes (DTCs) like P0601, P0602, or P0606, which point directly to an internal computer failure. Other common signs include:
- Engine stalling or cutting out while driving
- Harsh or unpredictable automatic transmission shifts
- Complete failure to start, even with a good battery and starter
- Poor fuel economy and reduced engine power
- Communication errors with diagnostic scan tools
This unit is the definitive solution. We take a quality, tested module and flash it with the latest official GM software updates, precisely matched to your vehicle’s Vehicle Identification Number (VIN). This ensures that once installed, it communicates perfectly with all other systems in your truck, restoring the performance and reliability you depend on.
Features & Benefits
- ✔ Plug-and-Play Installation: Arrives programmed to your specific VIN. Simply install the module, and you’re ready to go—no expensive trip to the dealership for programming is required.
- ✔ Latest GM Software: We flash each computer with the most current GM calibration, ensuring optimal engine performance, fuel efficiency, and transmission shifting.
- ✔ Guaranteed Compatibility: A direct replacement for part number 12569773 and many others (see full list), ensuring a perfect fit and function for your Envoy, Trailblazer, Rainier, H3, and more.
- ✔ Solves Common Issues: The correct fix for internal PCM failure codes (P0601), communication errors, and other puzzling running problems.
- ✔ Rigorously Inspected: Every module is thoroughly inspected and tested to ensure it’s ready for years of dependable service.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
An Expert’s Take on the GMT360 Platform
As a technician, I’ve worked on hundreds of these GMT360 trucks—the Trailblazers, Envoys, and their siblings. They are tough, well-built vehicles with engines that can last for well over 200,000 miles. However, after 15+ years of heat cycles, vibration, and exposure to the elements, the original PCM is a known weak point. The electronics inside simply wear out. In the past, a replacement meant towing the vehicle to a dealer for a costly new unit and programming. This pre-programmed module changes the game. It’s the exact solution I’d use in my own shop to get a customer’s truck back on the road quickly, affordably, and correctly.
Frequently Asked Questions
Where do I provide my vehicle’s VIN?
After you complete your purchase, you can add your VIN to the order notes or send it to us in a message. We must have your VIN to program the module before we can ship it.
Is this really a plug-and-play installation?
Yes, this PCM comes fully programmed. In most cases, you can simply install it and start the vehicle. Some GM vehicles may require a simple, 10-minute security relearn procedure (often called a CASE relearn) which you can do yourself without any special tools. Instructions are readily available online for this process.
Will this fit if my original part number is different?
Yes, this module is a direct replacement for a wide range of part numbers, including 12588650, 12591647, 12604438, and many others listed in the description. As long as your vehicle is on the compatibility list, we will program it correctly for your VIN.
What tools are needed to replace the PCM?
You will only need basic hand tools, typically a socket set to disconnect the battery and unbolt the module’s mounting bracket and connectors. The PCM on these vehicles is usually located in the engine bay and is easily accessible.
Will this fix my specific problem?
If your vehicle has been properly diagnosed with a faulty PCM, this is the correct solution. It is specifically designed to resolve issues like internal module failure codes (e.g., P0601), communication faults, and other symptoms directly caused by the engine computer. We always recommend confirming the diagnosis before ordering.