Programmed 12586242 ECM for 2004 GM Trucks & SUVs | Engine Computer ECU

Is Your Truck or SUV Running Rough? Get Back on the Road with Confidence.

There’s nothing more frustrating than a vehicle you can’t depend on. If your 2004 GM truck or SUV is suffering from stalling, a persistent check engine light, or a complete no-start condition, a failing Engine Control Module (ECM) is often the culprit. This isn’t just an inconvenience; it’s a critical failure that sidelines your workhorse. This replacement engine computer, compatible with service number 12586242, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by programming the unit specifically to your vehicle’s VIN before it ever leaves our facility, ensuring a smoother installation process.

Common Symptoms of a Failing GM ECM & Your Direct Solution

A faulty ECM can cause a wide range of confusing and intermittent issues. If you’re experiencing any of the following, it’s a strong indicator that your engine’s brain needs attention:

• Check Engine Light (CEL): Often with communication-related diagnostic trouble codes (DTCs) like P0601, P0602, or P0606.
• No-Start or Hard-Start: The engine cranks but refuses to start, or only starts after extended cranking.
• Stalling & Rough Idle: Your vehicle may stall unexpectedly while driving or idle erratically at a stop.
• Poor Fuel Economy: The engine may run rich or lean, drastically reducing your MPG.
• Erratic Transmission Shifting: The ECM plays a key role in transmission control, and a failure can lead to harsh or incorrect shifts.

This Programmed 12586242 ECM ECU is the direct answer to these problems, providing a reliable and correctly configured replacement to get your vehicle operating as the factory intended.

Features & Benefits

• ✔ VIN-Specific Programming Included: We flash the module with the latest GM software updates using your vehicle’s VIN. This ensures compatibility with your specific options and security system, making installation straightforward.
• ✔ Restore Peak Performance: A correctly functioning ECM is essential for proper fuel delivery, spark timing, and emissions control. Restore the power and efficiency you’ve been missing.
• ✔ Guaranteed Compatibility: This unit is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for a wide range of 2004 GM trucks and SUVs.
• ✔ Cost-Effective Solution: Avoid the high costs and programming fees of a dealership visit. This module provides a high-quality solution at a fraction of the price.
• ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.

An Expert’s Note on VIN Programming

“In my 20 years of diagnostics, I’ve seen countless DIY repairs go wrong because of an unprogrammed module. On these 2004 GM vehicles, the ECM is not just a simple computer; it’s integrated with the anti-theft system (VATS/Passlock) and other vehicle-specific modules. Simply swapping a used computer from another truck won’t work—the vehicle won’t start. Having the unit pre-programmed to your VIN is the single most important step for a successful repair. It ensures all systems communicate correctly, saving you from a tow to the dealer and hundreds in diagnostic fees.”

Don’t let a faulty computer keep your truck parked. By ordering our Programmed 12586242 ECM ECU, you are choosing a reliable, professionally prepared part that is ready to get your vehicle back to work. Simply provide your VIN after purchase, and we’ll handle the complex programming for you.

Frequently Asked Questions