Restore Your Vehicle’s Performance and Reliability
Are you battling a persistent Check Engine Light, experiencing frustrating no-start conditions, or noticing a sudden drop in fuel economy? A failing Powertrain Control Module (PCM) is often the hidden culprit behind these issues, acting as the brain of your vehicle’s engine. This direct-replacement 12586243 PCM is the definitive solution to get your 2004 GM vehicle back on the road, running exactly as it should. We eliminate the guesswork and the expensive dealership visits by programming the module to your vehicle’s specific VIN before it ships, ensuring a straightforward installation process.
Common Symptoms & Your Solution
If your vehicle is exhibiting any of the following symptoms, a faulty engine computer is the likely cause. This module is designed to correct these problems and restore factory performance:
- Erratic engine performance, stalling, or rough idling
- Failure to start or intermittent starting issues
- Active Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0605, or P0606
- Poor fuel mileage and hesitation during acceleration
- Transmission shifting problems or harsh engagement
- Apparent failure of sensors that test as functional
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with the latest GM software updates using your vehicle’s VIN. This ensures 100% compatibility and makes installation a breeze, often without needing a trip to the dealer.
- ✔ Restored Engine Efficiency: With updated software and reliable hardware, your engine will regain its optimal fuel efficiency and power delivery, saving you money at the pump.
- ✔ Direct-Fit Guarantee: This unit is a direct replacement for part numbers 12586243 and 89017739, ensuring a perfect fit and correct electronic communication with all vehicle systems.
- ✔ Rigorously Inspected: Every module undergoes a thorough inspection and testing process to guarantee it meets or exceeds original equipment standards for performance and durability.
- ✔ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note: A common pitfall for both DIY mechanics and professionals is chasing ghosts by replacing multiple sensors (like camshaft or crankshaft position sensors) only to find the problem persists. A failing PCM can send false signals, making good sensors appear faulty. Before you spend another dollar on sensors, consider the source. A faulty 12586243 PCM is frequently the root cause of these baffling electronic issues, and replacing it first can save you hundreds in parts and diagnostic time.
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). You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship your part until we receive the VIN.
Will I need to do anything else after installing this PCM?
In many cases, the vehicle will start and run immediately. However, some GM vehicles may require a simple security relearn procedure (often called Passlock or Passkey) which can be done without special tools and typically takes 10-30 minutes. Instructions are readily available online for your specific model.
Is this a brand new part?
This is a professionally inspected and verified original equipment part. Each unit is tested to ensure it meets strict quality and performance standards, providing you with a reliable and cost-effective alternative to a new dealership part.
What if my original part number is 89017739?
This module is a fully compatible replacement for part number 89017739 as well. As long as your vehicle is on the compatibility list, this unit will function correctly once programmed to your VIN.
How long does the programming process take?
Programming is typically completed within one business day of receiving your VIN. Our goal is to program and ship your 12586243 PCM as quickly as possible to minimize your vehicle’s downtime.