Is Your 2004 GM Truck or SUV Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition in your 2004 Silverado, Sierra, Tahoe, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. This unit is the brain of your vehicle, and when it falters, it can cause a host of frustrating and concerning issues. Don’t let a faulty computer keep your reliable truck off the road. This is the straightforward, dependable solution to restore your vehicle’s performance and get you back behind the wheel with confidence.
Common Symptoms & Your Solution
A failing engine computer can manifest in many ways. You might be experiencing one or more of the following problems:
- Engine stalling or misfiring
- Harsh or incorrect automatic transmission shifting
- Reduced power and sluggish acceleration
- Significantly decreased fuel mileage
- Communication error codes (U-codes)
- Vehicle won’t start, even with a good battery and starter
This replacement 2004 Silverado 1500 Engine Computer 12586242 is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it communicates perfectly with your truck’s systems right out of the box, just like the original.
Features & Benefits
- âś” VIN-Programmed for Your Truck: Simply provide your VIN during checkout, and we’ll flash the unit with the latest GM-certified software for your exact vehicle. This critical step ensures seamless integration and performance.
- âś” Saves Time & Money: By arriving pre-programmed, this module eliminates the need for an expensive trip to the dealership for programming, saving you hundreds of dollars and significant downtime.
- âś” Restores Original Performance: With fresh software and reliable hardware, this computer corrects engine and transmission management issues, restoring the power, efficiency, and smooth operation you expect.
- âś” Direct-Fit Replacement: Engineered to be a perfect match for service number 12586242 and other compatible numbers, guaranteeing a straightforward installation with no modifications required.
- âś” Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Installation
“I’ve seen countless DIY mechanics and even professional shops get stuck after installing a used computer from a salvage yard. The truck won’t start, or it runs terribly. Why? Because the module isn’t programmed for that specific vehicle’s VIN and options. That’s what makes a pre-programmed unit like this so valuable. It solves the problem the first time. After installation, the only thing left is a simple security relearn procedure, which you can do yourself in about 15 minutes right in your driveway. It’s the smartest way to tackle this repair.”
Get your truck back to being the reliable workhorse it was meant to be. This programmed 2004 Silverado 1500 Engine Computer 12586242 is the most effective way to solve complex electronic issues and ensure your vehicle runs smoothly for years to come. By matching this to your VIN, we provide a part that is truly ready for your vehicle.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM), often called an Engine Computer (ECM), is a powerful computer that controls all aspects of your vehicle’s engine and transmission. It manages fuel injection, ignition timing, emissions systems, and shift points to ensure optimal performance, fuel economy, and reliability.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
Do I need to do anything after installing this computer?
Yes. While the main programming is done, you will need to perform a security relearn procedure (also known as a CASE relearn or Passlock relearn) after installation. This syncs the new computer with your vehicle’s anti-theft system and can typically be done without any special tools. Instructions are widely available online for your specific model.
Will this fit if my original part number is different?
Yes, this unit is a direct replacement for several service numbers, including 12586242, 19299226, 89017738, and many others listed in the fitment data. As long as your vehicle is listed and your original service number is on our cross-reference list, this module will work perfectly once programmed to your VIN.
Is this a difficult part to replace?
For most 2004 GM trucks and SUVs, the engine computer is located in the engine bay, often under the battery tray or next to the airbox. It is held in by a few bolts and has several large electrical connectors. The physical replacement is straightforward for someone with basic mechanical skills. The most important part is ensuring the battery is disconnected before you begin.