Is your 2004 Silverado, Sierra, Trailblazer, or other GM truck struggling with frustrating engine problems? A faulty engine computer can cause a cascade of issues, from poor performance and stalling to a complete no-start condition, leaving you stranded and stressed. This professionally programmed Powertrain Control Module (PCM) is the definitive solution to restore your vehicle’s reliability and get you back on the road with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing PCM is the likely culprit. This unit is the direct fix for:
- Intermittent or complete no-start conditions
- Check Engine Light (CEL) with communication-related DTCs (e.g., U-codes)
- Harsh or erratic automatic transmission shifting
- Poor fuel economy and engine performance
- Stalling or cutting out while driving
- Inaccurate gauge readings or instrument cluster warnings
Instead of paying for expensive dealership diagnostics and programming, this 2004 GM 12586242 Engine Computer PCM arrives at your door programmed to your vehicle’s specific VIN. We load the latest, most stable software updates from General Motors, often correcting factory flaws and improving overall drivability beyond what your original unit could offer.
Features & Benefits
- ✔ VIN-Matched Programming: We flash this computer with your vehicle’s unique VIN, ensuring it communicates perfectly with your truck’s existing systems right out of the box.
- ✔ Latest GM Software Updates: Benefit from improved engine and transmission logic that can enhance performance, shifting, and fuel efficiency.
- ✔ Plug-and-Play Installation: Once a simple security relearn procedure is performed (no special tools needed), this unit is ready to go. No trip to the dealer is required.
- ✔ Guaranteed Compatibility: This is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit and function for your 2004 GM truck or SUV.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Work Truck Lifesaver
We recently worked with a contractor whose 2004 Silverado 2500 with the 6.0L engine was randomly dying on job sites. He had replaced the fuel pump and crank sensor with no luck. The problem was an intermittent failure within the original PCM. We sent him this pre-programmed 2004 GM 12586242 Engine Computer PCM, he installed it in his driveway in under 30 minutes, and his truck was back to being the reliable workhorse he depends on. It’s a straightforward fix that saves you from expensive guesswork.
Frequently Asked Questions
Do I need to have this computer programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN after you place your order, and it will arrive ready for installation.
What is the ‘security relearn’ procedure?
This is a simple process you can do yourself with just your key. It involves cycling the ignition on and off in a specific 30-minute sequence to sync the new PCM with your vehicle’s anti-theft system. We include easy-to-follow instructions with your order.
How do I find my original service number to confirm fitment?
Your vehicle’s original PCM will have a sticker on it with a service number (e.g., 12586242). Match that number to the list in our description to guarantee compatibility. The PCM is typically located in the engine bay, either next to the airbox or under the battery tray.
Will this work if my vehicle has modifications?
This PCM is programmed for a stock vehicle configuration using the VIN you provide. It is not designed to account for significant aftermarket modifications like internal engine changes, forced induction, or non-factory tire sizes.
What happens after I place my order?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. We cannot program and ship your 2004 GM 12586242 Engine Computer PCM until we receive this information. We will reach out to you with instructions on how to provide it.