Get Your Truck Back to Peak Performance
Is your 2004 Sierra 3500, or another compatible GM vehicle, suffering from frustrating and unpredictable engine problems? A faulty Powertrain Control Module (PCM) can cause a host of issues, from a simple check engine light to a vehicle that won’t start at all. This replacement engine computer, service number 12586242, is the definitive solution to restore your vehicle’s reliability and get you back on the road with confidence. We take the guesswork out of the repair by programming the unit specifically to your vehicle’s VIN before it ever leaves our facility.
Common Symptoms of a Failing PCM & Your Direct Solution
If you’re experiencing any of the following, a failing PCM is a likely culprit. This unit is designed to correct these problems:
- Erratic engine performance, stalling, or rough idling
- Failure to start or intermittent starting problems
- Poor fuel economy and shifting issues
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0606
- Instrument cluster warning lights that appear without reason
Instead of paying for expensive dealership diagnostics and programming, this unit offers a simple, direct-fit solution. This is the correct 2004 Sierra 3500 PCM 12586242 to get your vehicle operating as it should.
Features & Benefits
- โ Ready to Install: This module arrives pre-programmed to your vehicle’s unique VIN. No extra trips to the dealer for expensive flashing are required.
- โ Updated Software: We flash the computer with the latest GM-released software updates, ensuring optimal engine performance, fuel efficiency, and emissions control.
- โ Guaranteed Compatibility: This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, and a wide range of broadcast codes including YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
- โ Broad Application: Fits a wide range of 2004 GM trucks and SUVs, including the Silverado, Suburban, Tahoe, Yukon, Escalade, and more, ensuring a perfect match for your application.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of VIN Programming
Many people assume you can just swap an engine computer from another vehicle. On modern GM trucks, this simply won’t work. The PCM is tied directly to your vehicle’s anti-theft system (VATS/Passlock) and specific options. Our VIN programming service ensures the replacement computer communicates perfectly with all other modules in your truck, from the instrument cluster to the transmission controller. This critical step prevents no-start conditions and compatibility errors, saving you hours of frustration and diagnostic fees. When you order a 2004 Sierra 3500 PCM 12586242 from us, you’re getting a component that’s truly ready for your specific vehicle.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. This computer comes fully programmed to your vehicle’s VIN and flashed with the latest GM software. It is designed to be a plug-and-play installation, though some vehicles may require a simple security relearn procedure which takes about 30 minutes and can be done without any special tools.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship your part until we receive this information, as it is essential for the programming process.
How do I confirm this PCM is the right one for my truck?
The best way is to match the service number from your original computer. This unit replaces service number 12586242 and many others listed in the description. If you are unsure, please contact us with your VIN and we will be happy to verify compatibility for you.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (such as a P0601 code), this replacement unit will solve the problem. However, if the light is on due to a faulty sensor or other component on the vehicle, you will still need to address that separate issue. This 2004 Sierra 3500 PCM 12586242 will ensure the vehicle’s brain is functioning correctly.
What is the warranty on this part?
This unit is backed by our one-year replacement warranty, giving you confidence in your repair.