---
product_id: 317591972
title: "2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN"
brand: "flashmasters"
price: "€ 31.15"
currency: EUR
in_stock: false
url: https://www.desertcart.fi/products/317591972-2004-sierra-engine-computer-12586242-ecm-pcm-ecu-programmed-to
store_origin: FI
region: Finland
---

# Instructions Included VIN-Programmed Fits 2004 GMC Sierra 2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN

**Brand:** flashmasters
**Price:** € 31.15
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Upgrade Your Ride with Precision Performance!

## Quick Answers

- **What is this?** 2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN by flashmasters
- **How much does it cost?** € 31.15 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/317591972-2004-sierra-engine-computer-12586242-ecm-pcm-ecu-programmed-to)

## Best For

- flashmasters enthusiasts

## Why This Product

- Trusted flashmasters brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Quality Assurance:** Manufactured to meet OEM standards for peace of mind.
- • **User-Friendly Setup:** Comes with clear instructions for hassle-free installation.
- • **Enhanced Performance:** Boosts engine efficiency and reliability.
- • **Precision Programming:** Tailored to your unique VIN for optimal performance.
- • **Versatile Compatibility:** Designed for 2004 GMC Sierra models with various engine sizes.

## Overview

The 2004 GMC Sierra Engine Computer (ECM) 12586242 is a high-quality, VIN-programmed engine control module designed specifically for 2004 GMC Sierra models with engine sizes ranging from 4.8L to 8.1L. This product ensures optimal engine performance and reliability, complete with user-friendly installation instructions.

## Description

This Engine Control Module (ECM/PCM/ECU) is a professionally remanufactured OEM unit designed to restore proper factory operation. Programmed to your vehicle VIN before shipment. Please provide your VIN after ordering. Verify that your original part number matches before ordering. If you are unsure, send your VIN and part number through desertcart messaging and we will help review the application. Some vehicles may require an anti-theft relearn and/or crankshaft variation relearn after installation. Instructions are provided when applicable. Includes a 1-year limited warranty unless otherwise stated. Warranty is void if the item has been opened, altered, or tampered with after delivery. We are not responsible for labor, towing, diagnostic fees, installation costs, or other related expenses. This product is intended only to restore original factory operation and does not modify emissions or performance.

## Features

- VIN Required After Purchase – Message us your VIN for proper vehicle matching before shipment
- Verify Part Number Before Ordering – Exact match required; VIN can be provided for fitment assistance
- Remanufactured OEM Module – Designed to restore original vehicle system function
- Installation May Require Relearn – Anti-theft and/or crankshaft variation relearn may be required
- Expert Technical Support Available – Contact us through desertcart messaging for compatibility or installation help

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07N98KFJQ |
| Best Sellers Rank | #2,635,847 in Automotive ( See Top 100 in Automotive ) #406 in Automotive Replacement Engine Computers |
| Customer Reviews | 5.0 5.0 out of 5 stars (3) |
| Department | Unisex Adult |
| Manufacturer | Flashmasters |

## Product Details

- **Color:** Multicolor
- **Brand:** Flashmasters
- **Voltage:** 12 Volts (DC)
- **Manufacturer:** Flashmasters

## Images

![2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN - Image 1](https://m.media-amazon.com/images/I/61JUH8yh96L.jpg)
![2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN - Image 2](https://m.media-amazon.com/images/I/71cSvFKNxvL.jpg)
![2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN - Image 3](https://m.media-amazon.com/images/I/91oTwYQTvnL.jpg)
![2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN - Image 4](https://m.media-amazon.com/images/I/91vvZlDjLXL.jpg)
![2004 Sierra Engine Computer 12586242 ECM PCM ECU Programmed to Your Vehicle VIN - Image 5](https://m.media-amazon.com/images/I/91CDyqrQ-8L.jpg)

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**Shop now:** [https://www.desertcart.fi/products/317591972-2004-sierra-engine-computer-12586242-ecm-pcm-ecu-programmed-to](https://www.desertcart.fi/products/317591972-2004-sierra-engine-computer-12586242-ecm-pcm-ecu-programmed-to)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-08-08*