---
product_id: 317591972
title: "2004 GMC Sierra Engine computer 12586242 \"Programmed to your VIN\" ECM PCM ECU"
brand: "flashmasters"
price: "A$415"
currency: AUD
in_stock: true
url: https://www.desertcart.com.au/products/317591972-2004-gmc-sierra-engine-computer-12586242-programmed-to-your-vin
store_origin: AU
region: Australia
---

# Instructions Included VIN-Programmed Fits 2004 GMC Sierra 2004 GMC Sierra Engine computer 12586242 "Programmed to your VIN" ECM PCM ECU

**Brand:** flashmasters
**Price:** A$415
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade Your Ride with Precision Performance!

## Quick Answers

- **What is this?** 2004 GMC Sierra Engine computer 12586242 "Programmed to your VIN" ECM PCM ECU by flashmasters
- **How much does it cost?** A$415 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/317591972-2004-gmc-sierra-engine-computer-12586242-programmed-to-your-vin)

## 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 E.C.M. fits the following vehicles: 2004 4.8/5.3/6.0/8.1L GMC Sierra (1500, 1500HD, 2500. 2500HD, 3500).   This auction is for one service number 12586242 ECM (Engine control module) that is programmed for your vehicle  using the latest software updates using your V.I.N. (Vehicle identification number) to exactly  match your vehicle. After you purchase the E.C.M. you will need to provide us with your V.I.N so that  we can program the E.C.M.There is no core charge you keep your old E.C.M.Two things may have to be done after you install your E.C.M. First an anti-theft relearn may have to be performed. If this is the case the truck will not start.   The second thing is that a crankshaft variation relearn may need to be performed once the vehicle is  running. This will be evident if the check engine or service engine soon light comes on once the vehicle  is running. You will need access to a scan tool capable of doing this procedure to do this and clear any related trouble codes (Code  P0315). If this is not available to you a repair shop will have to perform this and clear the  related trouble code. The vehicle will run normal but the ”service engine soon” light will come on and a  trouble code will be stored until this is resolved.   Instructions for both procedures will be included.   We will within one business days of payment.   Same day ping if ordered before 2:00 P.M. EST (Mon. - Fri.)

## Features

- Manufacturer Part Number: 12586242
- This E.C.M. fits the following vehicles: 2004 4.8/5.3/6.0/8.1L GMC Sierra
- After you purchase the E.C.M. you will need to provide us with your V.I.N so that we can program the E.C.M.
- Instructions Included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Text | 1 text input |
| Color | Multicolor |

## Product Details

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

## Images

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

---

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**Shop now:** [https://www.desertcart.com.au/products/317591972-2004-gmc-sierra-engine-computer-12586242-programmed-to-your-vin](https://www.desertcart.com.au/products/317591972-2004-gmc-sierra-engine-computer-12586242-programmed-to-your-vin)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-10*