End the Guesswork and Get Your Vehicle Running Right
Is your Chevrolet, Pontiac, or Buick suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your engine. Driving with a faulty PCM not only hurts performance and fuel economy but can also lead to more significant and costly damage down the road. This isn’t just an inconvenience; it’s a matter of reliability and safety for you and your family.
Common Symptoms of a Failing PCM & Your Direct Solution
A failing engine computer can manifest in numerous ways, often leading to confusion and expensive diagnostic bills. If you’re experiencing any of the following, this module is your solution:
- Persistent Check Engine Light: Especially with diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- Engine Performance Problems: Unexplained stalling, hesitation during acceleration, rough running, or a noticeable drop in fuel efficiency.
- No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
- Transmission Shifting Issues: Erratic or harsh shifting that isn’t related to a mechanical transmission problem.
- Communication Errors: Your mechanic’s scan tool cannot communicate with the PCM.
This genuine used GM PCM is the definitive fix. We take a quality, road-tested unit and flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This process ensures that your new computer works seamlessly with your car’s existing systems, just as it did from the factory. By choosing our Programmed 12591279 PCM, you are getting a reliable, cost-effective solution that restores your vehicle’s dependability.
Features & Benefits
- ✔ VIN-Programmed for You: Arrives ready to install, eliminating the need for an expensive trip to the dealership for programming. This is a true plug-and-play solution.
- ✔ Loaded with Latest GM Updates: We flash the module with the most current software from General Motors, ensuring optimal engine performance, fuel efficiency, and emissions control.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for part numbers 12591279 and 12591856, ensuring a perfect fit and function for the specified models.
- ✔ Restores Peak Performance: A correctly functioning PCM resolves issues like poor idle and hesitation, giving you back the smooth, responsive driving experience you expect.
- ✔ Cost-Effective Repair: Get the reliability of a properly functioning OEM part without the high cost of a new module and dealer service fees.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Expert’s Note: The ‘Phantom Problem’ Solver
I once worked with a customer whose 2005 Equinox had a bizarre, intermittent stalling issue that three other shops couldn’t diagnose. They had replaced sensors and checked wiring for weeks. The problem was, the old PCM had a subtle internal fault that only appeared when the engine was warm. It wasn’t throwing a clear code, causing endless frustration. Installing a correctly matched and Programmed 12591279 PCM like this one solved the problem on the first try. It’s a reminder that the engine’s ‘brain’ is critical, and having one with fresh, correct software is often the key to solving the most stubborn issues.
Frequently Asked Questions
Do I need to do any additional programming after I receive this?
No. This PCM comes fully programmed to the VIN you provide. In most cases, it is a direct plug-and-play installation. Some vehicles may require a simple security relearn procedure, which can typically be done without special tools and instructions can be easily found online.
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we receive your VIN, as the programming is specific to your vehicle.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part that has been sourced from a salvaged vehicle. This allows us to provide a reliable OEM component at an excellent value.
What if my original part number is 12591856?
This module, part number 12591279, is a fully compatible and interchangeable replacement for part number 12591856. When programmed to your VIN, it will function identically.
Where is my vehicle’s VIN located?
You can find your VIN on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What does the one-year replacement warranty cover?
The warranty covers the failure of the unit itself. If the module fails within one year of the purchase date, we will provide a replacement unit. It does not cover labor costs or issues caused by other faults in the vehicle.