Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Chevy Avalanche, Sierra, or Silverado struggling with performance issues? A faulty Powertrain Control Module (PCM) is often the culprit behind frustrating problems like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition. Don’t let a failing computer keep your reliable truck sidelined. This is the simple, dependable solution to get your vehicle back on the road, running exactly as it should.
This unit, also known by service number 19299226, arrives at your door fully programmed to your vehicle’s unique Vehicle Identification Number (VIN). We flash it with the latest, most stable software updates from GM, ensuring all factory improvements and fixes are applied. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
Common Symptoms of a Failing GM PCM & Your Solution
If you’re experiencing any of the following, a replacement PCM is the most likely fix:
- Check Engine Light (CEL) is on with various trouble codes (DTCs)
- Engine cranks but will not start
- Rough or unstable idle
- Noticeable decrease in fuel mileage
- Transmission shifting harshly or at the wrong times
- Vehicle fails to communicate with a diagnostic scan tool
Installing this professionally programmed 2004 Avalanche 1500 PCM 12586242 is the definitive solution to these complex electronic issues, restoring the vital communication between your engine, transmission, and other onboard systems.
Features & Tangible Benefits
- ✔ Plug-and-Play Installation: Arrives pre-programmed specifically for your vehicle using your VIN. Simply install the unit and perform a quick security relearn procedure—no dealer tools required.
- âś” Updated GM Software: We load the latest factory calibrations to correct common bugs and improve overall engine and transmission performance.
- âś” Guaranteed Compatibility: A direct replacement for a wide range of service numbers, including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
- âś” Restore Drivability: Put an end to frustrating hesitation, stalling, and poor performance. Enjoy the smooth, reliable power your truck was built to deliver.
- âś” One-Year Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
From our 20+ years of diagnostic experience, we can’t overstate the importance of correct VIN programming. Your truck’s VIN isn’t just a serial number; it’s a blueprint that tells the PCM about your specific engine, transmission, axle ratio, tire size, and other critical options. A generic, non-programmed module can cause transmission damage, incorrect speedometer readings, and a cascade of error codes. Our process ensures this 2004 Avalanche 1500 PCM 12586242 is a perfect electronic match for your truck, guaranteeing seamless integration and proper function from the moment you turn the key.
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. This is the main benefit of our service. We program the computer with your vehicle’s VIN before we ship it. It arrives ready to be installed, saving you a costly trip to the dealership.
How do I provide my VIN?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. You can typically find this on your driver’s side dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.
What is the security relearn procedure?
Most GM vehicles of this era use a Passlock/VATS security system that requires a simple ‘relearn’ procedure after the PCM is replaced. This can be done without any special tools and typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. We include easy-to-follow instructions with your order.
Is this a guaranteed fit for my vehicle?
This 2004 Avalanche 1500 PCM 12586242 is a direct replacement for the extensive list of models and service numbers provided in the fitment data. The best way to ensure compatibility is to match the service number on your current computer to one of the numbers listed.
What tools are required for installation?
Installation is straightforward and requires only basic hand tools, such as a socket set, to disconnect the battery and remove the mounting brackets for the old PCM. Always disconnect the negative battery terminal before beginning work.