Restore Your GM’s Performance and Reliability
Is your 2004 GM truck or SUV suffering from frustrating issues like a persistent check engine light, erratic shifting, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep you off the road. This replacement 2004 GM 12586242 PCM is the definitive solution to restore your vehicle’s original performance and get it running smoothly again.
Common Symptoms of a Failing PCM & Your Direct-Fit Solution
A failing PCM can cause a cascade of problems that can be difficult to diagnose. If you’re experiencing any of the following, your engine computer is the likely culprit:
- Check Engine Light with communication codes (e.g., U0100) or internal processor codes (e.g., P0601, P0606).
- Vehicle won’t start or stalls intermittently.
- Harsh or unpredictable automatic transmission shifting.
- Noticeable decrease in fuel efficiency.
- Failure to pass state emissions testing.
This module is the core of your vehicle’s operating system. Our professionally programmed 2004 GM 12586242 PCM is flashed with the latest GM software updates, tailored specifically to your vehicle using its unique Vehicle Identification Number (VIN). This ensures seamless communication between the engine, transmission, and other onboard systems, correcting the root cause of these issues.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives ready to install with the latest GM calibrations specific to your truck or SUV. No expensive trip to the dealership for programming is required.
- ✔ Restores Original Performance: Corrects issues with engine timing, fuel delivery, and transmission shift points for a smoother, more responsive driving experience.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for units with service numbers 12586242, 19299226, 89017738, and others listed in the fitment guide.
- ✔ Plug-and-Play Installation: Once installed, a simple security relearn procedure is all that’s needed to sync the computer with your vehicle’s anti-theft system.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
As a technician with over two decades of experience, I can’t stress this enough: proper VIN programming is non-negotiable for these GM vehicles. The PCM is tied directly to your vehicle’s security system (VATS/Passlock) and specific options. Simply swapping in a used computer from another vehicle will result in a no-start condition. We take the guesswork out of the repair by programming the module before it ships. This ensures that when you receive your 2004 GM 12586242 PCM, it’s truly ready to solve your problem and integrate perfectly with your vehicle.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before shipping the part to you. All we need is your vehicle’s VIN to load the correct GM software and calibrations.
Where do I provide my vehicle’s VIN?
You can add your VIN to the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship the module until it has been programmed.
Is this part difficult to install?
Installation is straightforward for anyone with basic mechanical skills. After installing the module, you will need to perform a simple security relearn procedure, which typically takes 10-30 minutes and does not require special tools. Instructions are readily available online or we can help guide you.
How can I be sure this PCM fits my vehicle?
The best way to confirm compatibility is to match the service number from your original PCM to one of the numbers listed in our fitment guide (e.g., 12586242, YFXL, YFKD). If you’re unsure, please contact us with your VIN, and we’ll be happy to verify the correct part for you.
What does the one-year warranty cover?
The warranty covers the module for one year from the date of purchase. In the unlikely event of a failure, we will provide a replacement unit.