Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Sierra Denali, Silverado, or other GM vehicle suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? A failing Powertrain Control Module (PCM) is often the culprit, disrupting communication between your engine and transmission. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle back on the road, running with the power and reliability you depend on. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s specific VIN, ensuring a seamless installation process and optimal performance right out of the box.
Common Symptoms & Your Solution
If you’re experiencing any of the following, it’s a strong indicator that your engine computer has failed. This professionally programmed module is designed to resolve these exact problems:
- Erratic engine performance or misfires
- Poor fuel economy
- Transmission shifting problems
- Vehicle won’t start or dies unexpectedly
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs)
- Failure to pass emissions testing
By installing this pre-flashed 2004 Sierra Denali PCM 12586242, you are not just replacing a part; you are restoring your vehicle’s core operational integrity with the latest GM software updates.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the unit with your specific Vehicle Identification Number, ensuring 100% compatibility with your truck’s factory settings and options.
- ✔ Plug & Play Installation: Because the module arrives pre-programmed, it simplifies the installation process. In most cases, a security/CASE relearn procedure is all that’s needed.
- ✔ Updated GM Software: Your PCM will be loaded with the newest dealership-level software from General Motors, addressing known bugs and improving performance.
- ✔ Broad Compatibility: A direct replacement for service numbers 12586242, 19299226, 89017738, and many others, fitting a wide range of 2004 GM trucks and SUVs.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of VIN Programming
Many sellers offer blank or used PCMs, leaving the difficult and expensive programming to you. This often leads to compatibility issues, persistent error codes, and even immobilizing your vehicle. Our process eliminates that risk. By programming the module to your VIN before it ships, we ensure the PCM correctly communicates with your vehicle’s other modules—like the BCM and ABS—from the moment you install it. This is the same process a dealership uses, but without the high cost and hassle. This is the key to a successful and lasting repair for your 2004 Sierra Denali PCM 12586242.
Frequently Asked Questions
How does the programming process work?
After you place your order, simply provide us with your vehicle’s 17-digit VIN. We use this number to access the latest GM software updates specific to your truck or SUV and flash them directly onto the PCM. This ensures it’s ready for installation upon arrival.
Will I need to do anything after installing the PCM?
In most cases, you will need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This can often be done without special tools and syncs the new PCM to your vehicle’s anti-theft system. Instructions are widely available, or your mechanic can perform it quickly.
Is this the correct part for my vehicle?
This PCM is a direct replacement for service number 12586242 and many others listed in the description. Please check the service number on your original module to confirm a match. If you’re unsure, contact us with your VIN, and we’ll be happy to verify compatibility.
What information do you need from me?
All we need is your vehicle’s VIN to program the module. You can add it to the notes section during checkout or send it to us in a message after your purchase. We cannot ship your order until we receive the VIN.
What if my original part number isn’t 12586242?
This module is compatible with a long list of service numbers, including 19299226, 89017738, YFKD, YFKF, and more. Please review the full compatibility list in the product details. As long as your vehicle and original service number are listed, this unit will work perfectly once programmed to your VIN.