Get Your GM Truck Running Right Again
Is your 2004 Silverado, Sierra, or SUV plagued by a persistent check engine light, rough idling, or a frustrating no-start condition? A failing Powertrain Control Module (PCM) is often the culprit behind these complex issues, leaving you stranded and costing you valuable time. This replacement 2004 GM 12586242 PCM is the definitive, hassle-free solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s unique VIN before it ships, making installation straightforward and getting you back on the road or to the job site quickly.
Common Symptoms of a Failing 2004 GM PCM
If you’re experiencing any of the following, a faulty engine computer is the likely cause. This module directly resolves issues such as:
- Check Engine Light with codes like P0601, P0602, P0604, or P0606
- Engine stalling or cutting out while driving
- Harsh or erratic transmission shifting
- A significant drop in fuel economy
- Complete engine no-start, even with a good battery and starter
- Communication errors with diagnostic scan tools
Installing this professionally programmed 2004 GM 12586242 PCM is the most effective way to permanently fix these frustrating electronic problems and restore your vehicle’s factory-spec operation.
Features & Benefits
- ✔ Plug-and-Play Installation: Arrives pre-programmed to your specific VIN. No expensive trip to the dealership for flashing is required.
- ✔ Restored Engine Performance: Corrects fuel trim, ignition timing, and transmission shift points for a smooth and powerful ride.
- ✔ Guaranteed Compatibility: A direct OEM replacement for service number 12586242 and others listed, ensuring perfect fit and function.
- ✔ Updated Software: Flashed with the latest GM-approved software updates to enhance performance and efficiency.
- ✔ Cost-Effective Solution: Get the correct, programmed part you need without paying high dealership prices for the component and labor.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
“Many people don’t realize that on these 2004 GM vehicles, the PCM is the central hub for everything from the engine and transmission to the anti-theft system (VATS/Passlock). Simply swapping a used computer from another truck will result in a no-start condition every time. That’s why VIN-specific programming isn’t just a convenience—it’s essential. We ensure the module we send you has your vehicle’s exact software, so it communicates seamlessly with all other systems right out of the box. It’s the difference between a 30-minute fix and a week of headaches.”
Frequently Asked Questions
Is this PCM ready to install right out of the box?
Yes. After you place your order, you will need to provide us with your vehicle’s VIN. We use this to program the module specifically for your truck or SUV. This makes it a true plug-and-play part, with no further programming needed.
Where can I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
How do I confirm this is the correct part for my vehicle?
Please check the service number on your original computer. This unit replaces service numbers 12586242, 19299226, 89017738, and many others listed in the fitment data. Matching one of these numbers ensures compatibility with your 2004 GM 12586242 PCM.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes include P0601-P0606), then this part is the correct fix. However, a check engine light can be caused by many other components. It’s always best to have the codes scanned to help pinpoint the issue.
Do I need to perform a security relearn procedure?
In most cases, our programming handles the security information, but some GM vehicles may require a simple, 10-30 minute key-cycle relearn procedure after installation. This procedure requires no special tools and instructions are readily available online.
What if I have questions during installation?
Our team has extensive experience with these vehicles. If you have any questions, please contact us. We are here to help ensure your repair is a success.