Restore Your Vehicle’s Performance and Reliability
Is your family minivan or daily driver suffering from frustrating issues like a persistent check engine light, stalling, rough idling, or a complete no-start condition? A failing Powertrain Control Module (PCM) is often the culprit, leaving you stranded and stressed. This genuine GM PCM, part number 12591279, is the definitive solution to get your vehicle back on the road. We take the guesswork and high dealership costs out of the equation by pre-programming this unit specifically to your vehicle’s VIN before it ships. This ensures a seamless installation and restores the dependable performance you rely on every day.
Common Symptoms of a Failing PCM & Your Solution
If you’re experiencing any of the following, a faulty engine computer is the likely cause. This pre-programmed 2005-2006 Saturn Relay PCM is designed to resolve these exact problems:
- Erratic engine performance, poor acceleration, or reduced fuel economy.
- Intermittent or constant stalling for no apparent reason.
- Difficulty starting the engine or a complete no-start condition.
- Check Engine Light illuminated with communication error codes (like P0601, P0605, P0606).
- Harsh or incorrect transmission shifting.
- Other warning lights on the dashboard appearing without a clear cause.
By replacing your old module with this VIN-programmed unit, you are installing a reliable, cost-effective fix that directly addresses the root cause of these electronic failures.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this computer with the latest GM software using your vehicle’s specific VIN. This crucial step ensures perfect communication between the engine, transmission, and all other vehicle systems.
- ✔ Simple Plug-and-Play Installation: Because the programming is done for you, this module is ready to be installed right out of the box, eliminating the need for an expensive trip to the dealership.
- ✔ Cost-Effective Repair Solution: Get OEM functionality without the OEM price tag. This unit provides a reliable and affordable alternative to a brand-new computer.
- ✔ Broad GM Compatibility: This module is a direct replacement for part numbers 12591279 and 12591856, fitting a range of popular 2005-2006 GM vehicles like the Equinox, Malibu, G6, and GM minivans.
- ✔ One-Year Warranty: This unit is backed by our one-year replacement warranty., giving you confidence in your purchase.
An Expert’s Note on VIN Programming
“Many people don’t realize that a PCM isn’t just a generic part you can swap between cars. It’s the central command center, and it needs to speak the exact electronic language of your specific vehicle—from the engine size to the type of transmission and even the security system. We once had a customer who bought a generic, un-programmed module online for his family’s Uplander. The van started, but the transmission shifted violently and the anti-theft light flashed constantly. That’s because the PCM wasn’t matched. Our VIN-specific programming prevents all of that. We ensure the computer you receive is the perfect electronic match, just as it was from the factory, for a smooth, trouble-free repair.”
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). You can add it as a note during checkout or send it to us in a message. We cannot ship the module until we have your VIN to program it.
Is this installation difficult?
For most models, the PCM is located in the engine compartment and is accessible with basic hand tools. The physical swap is straightforward. After installation, you may need to perform a simple security relearn procedure, which typically involves turning the key on and off in a specific sequence. Instructions for this are widely available online or in repair manuals.
How do I know if my PCM is actually bad?
While this part resolves the issues listed above, it’s always best to have a proper diagnosis performed. Common diagnostic trouble codes (DTCs) pointing to a bad PCM include P0601, P0602, P0606, and other U-series communication codes. If your mechanic has confirmed the PCM is the point of failure, this is the correct part for you.
Will this work for my 2005 Chevy Equinox?
Yes, this module fits a wide range of GM vehicles from 2005-2006. Please check the compatibility list in the description to confirm it fits your specific make, model, and engine option. This is the correct 2005-2006 Saturn Relay PCM and also fits many other compatible models.
Is this a new part?
No, this is a used, genuine GM part that has been sourced from a salvaged vehicle. Each unit is tested to ensure it is fully functional before being programmed and shipped to you.