Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Sierra Denali, Yukon, or Escalade suffering from frustrating engine problems? A faulty Powertrain Control Module (PCM) can lead to a cascade of issues, from a persistent check engine light and poor fuel economy to rough idling, stalling, or even a no-start condition. This isn’t just an inconvenience; it’s a compromise on the power and reliability you depend on. This replacement Engine Control Module is the definitive solution, arriving at your door fully programmed to your vehicle’s specific VIN, ensuring a seamless restoration of your truck’s factory performance.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing engine computer is a likely culprit. This unit is designed to be the direct fix for these common issues:
- Erratic or harsh transmission shifting
- Engine stalling or cutting out unexpectedly
- Complete no-start or intermittent starting problems
- Poor acceleration and loss of power
- Reduced fuel mileage
- Check Engine Light (CEL) with communication codes (U-codes) or various sensor codes
Instead of paying for expensive dealership diagnostics and programming, this module provides a straightforward, effective repair. We use your vehicle’s VIN to flash the unit with the latest GM-certified software updates, so it’s ready for installation right out of the box. This is the most reliable way to get your powerful 2004 Sierra Denali PCM 12586242 functioning correctly again.
Features & Benefits
- ✔ Plug-and-Play Installation: Arrives pre-programmed to your specific VIN. No additional programming is required after installation.
- ✔ Latest GM Software: Flashed with the newest vehicle-specific updates from General Motors for optimal efficiency and performance.
- ✔ Guaranteed Compatibility: A direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
- ✔ Restores Engine Health: Solves common running issues caused by a faulty original computer, restoring smooth operation and power.
- ✔ Cost-Effective Solution: Avoids the high costs and scheduling hassles of a dealership visit for a simple module replacement.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a technician with over two decades of experience, I’ve seen countless issues arise from improperly matched control modules. On these GMT800 platform trucks, the PCM is the central hub, managing everything from fuel injection and ignition timing to transmission shift points and anti-theft systems. Simply installing a used computer from another truck won’t work—it will cause communication errors and a no-start condition. Our VIN-specific programming ensures that the module you receive is a perfect digital match for your truck’s unique configuration, options, and security system. This isn’t just a convenience; it’s essential for a correct and lasting repair on your 2004 Sierra Denali PCM 12586242.
Frequently Asked Questions
Do I need to do any programming myself?
No. This computer comes fully programmed to your vehicle’s VIN. The only additional step required is a simple security relearn procedure that you can do yourself in about 10-15 minutes with just the key. Instructions are provided.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). You can also add it as a note during the checkout process. We cannot ship your part until we have this information.
Where is this computer located on my 2004 Sierra Denali?
On most of the trucks like the Sierra, Silverado, and Suburban, the PCM is located in the engine bay on the driver’s side, under the battery tray. On other compatible models like the Trailblazer or Envoy, it is typically located next to the air filter box.
Will this fix my specific problem?
If your vehicle’s issues have been correctly diagnosed to a faulty engine computer, this part is the solution. It is a direct replacement for the 2004 Sierra Denali PCM 12586242 and its equivalent service numbers. We always recommend proper diagnostics to confirm the PCM is the point of failure before ordering.
Is this compatible with other part numbers?
Yes, this unit is the correct replacement for a wide range of service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please match one of these numbers from your original module to ensure compatibility.