Restore Peak Performance to Your GM Vehicle
Is your GM truck, van, or SUV suffering from a persistent check engine light, rough idle, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep you off the road. This pre-programmed 2004 GM 12586243 PCM is the definitive, reliable solution to restore your engine’s performance, smooth out transmission shifting, and bring back the dependability you count on every day.
Common Symptoms & Your Solution
A failing PCM can cause a wide range of frustrating issues. If you’re experiencing any of the following, this module is the solution you need:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0606
- Poor or erratic engine performance
- Reduced fuel efficiency
- Harsh or incorrect transmission shifting
- Engine stalling or difficulty starting
- Communication errors with diagnostic scan tools
By replacing your old unit with this professionally programmed 2004 GM 12586243 PCM, you are directly addressing the root cause of these problems and installing a lasting repair.
Features & Tangible Benefits
- ✔ VIN-Specific Programming: We flash the module with the latest GM-certified software using your vehicle’s unique VIN. This ensures 100% compatibility with your engine, transmission, and factory options for a true plug-and-play installation.
- ✔ Restored Factory Operation: Eliminates the guesswork and frustration of a faulty computer, restoring the crisp throttle response, smooth shifting, and optimal fuel economy your vehicle had when it was new.
- ✔ Direct-Fit Replacement: Engineered to be an exact match for the original part, guaranteeing a straightforward installation without the need for any modifications.
- ✔ Comprehensive System Solution: Corrects complex electronic issues that even experienced mechanics can struggle to diagnose, saving you time and money on unnecessary repairs.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Technician’s Note: Many drivers don’t realize that a PCM isn’t just a part number; it’s the brain of their vehicle, tailored to its specific options like engine size, transmission type, and even tire size. Simply swapping a used module often leads to more problems. Our process of programming this 2004 GM 12586243 PCM directly to your vehicle’s VIN ensures that every parameter is set correctly from the start. It’s the difference between a temporary patch and a permanent, reliable repair.
Frequently Asked Questions
Do I need to do any extra programming myself?
No. This module arrives at your door fully programmed to your vehicle’s VIN and ready for installation. In most cases, you will only need to perform a simple security relearn procedure, which can be done without any special tools and typically takes about 30 minutes. We include instructions to guide you.
What information do you need from me after I order?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is critical for us to program the module correctly for your specific vehicle configuration.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) typically refers to a computer that only controls engine functions. PCM (Powertrain Control Module) controls both the engine and the transmission. ECU (Electronic Control Unit) is a more generic term. For this application, PCM and ECM refer to the same part.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original PCM (such as with code P0601), then yes, this part will resolve the issue. It’s always recommended to have your vehicle properly diagnosed to ensure the PCM is the source of the problem before ordering.
How do I find my part number?
The part number is printed on a sticker on your original module. This module is a direct replacement for part numbers 12586243 and 89017739. If you are unsure, our extensive fitment list or our customer service team can help you confirm compatibility.