Restore Peak Performance to Your GM Vehicle
Is your truck, van, or SUV suffering from a persistent check engine light, poor running conditions, or a frustrating no-start issue? A failing Powertrain Control Module (PCM) is often the culprit, leaving you stranded and searching for a reliable solution. This is the definitive, hassle-free fix. We provide a high-quality replacement 2004 GM 12586243 PCM, professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This critical step ensures that when the module arrives at your door, it’s ready for a straightforward installation, getting you back on the road without an expensive trip to the dealership.
Common Symptoms of a Failing PCM & Your Direct Solution
If you’re experiencing any of the following, a faulty engine computer is the likely cause. This module is the solution for:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) related to the processor, such as P0601 or P0606
- Engine stalling, sputtering, or misfiring
- Harsh or erratic automatic transmission shifting
- Reduced fuel economy
- Complete no-start or no-spark condition
- Communication errors with diagnostic scan tools
Ordering our pre-programmed 2004 GM 12586243 PCM eliminates the guesswork and provides a direct path to resolving these complex electronic issues.
Features & Benefits You Can Count On
- ✔ VIN-Programmed for Your Vehicle: We flash the module with the latest GM-certified software updates using your VIN. This ensures perfect compatibility and function right out of the box.
- ✔ Skip the Dealership Hassle: Because the programming is done before we ship, you avoid the high costs and scheduling delays associated with dealership-level programming services.
- ✔ Restored Drivability: A properly functioning PCM is essential for optimal engine performance, smooth transmission shifting, and correct fuel delivery. Feel the difference a new brain makes for your vehicle.
- ✔ Extensive Compatibility: This module, also known as service number 89017739, fits a massive range of 2004 GM models, from the workhorse Silverado 3500 and Express vans to the performance-driven Corvette and GTO.
- ✔ One-Year Protection: This unit is backed by our one-year replacement warranty, giving you confidence in your repair.
An Expert’s Note on Installation
As a technician with over 20 years on the shop floor, I’ve seen countless hours wasted on electronic guesswork. The single biggest advantage of a pre-programmed module like this is the time and money it saves. You’re not just buying a part; you’re buying a solution that bypasses the most complicated step of the repair. Before installing any new module, I always advise a quick battery check and an inspection of the main power and ground connections at the PCM connector. A clean, tight connection is the foundation for a successful and lasting repair. This simple step ensures your new 2004 GM 12586243 PCM can perform its job perfectly from the moment you turn the key.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot ship your part until we receive and validate your VIN.
Will I need to do any extra programming after I install it?
In most cases, no additional programming is required. The module is programmed to your vehicle’s specifications. However, some vehicles may require a simple, key-on/key-off security relearn procedure, which can typically be done without any special tools. Instructions are widely available for this process.
What’s the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. PCM (Powertrain Control Module) is the most accurate term for this part as it typically controls both the engine and the transmission. ECM (Engine Control Module) and ECU (Engine Control Unit) are other common names for the same component.
How can I confirm this is the correct part for my vehicle?
Please check the extensive fitment list on this page. The most reliable method is to match the service number (12586243 or 89017739) on your original module. If you are still unsure, please contact us with your VIN before ordering, and we will be happy to verify compatibility.
What if I have a problem after installation?
Your purchase is protected. This unit is backed by our one-year replacement warranty. If you encounter any issues, please contact our support team for assistance with diagnostics and the warranty process.
Do I need to send my old computer (core) back?
No core charge is required for this part. You do not need to send your old module back to us.