Restore Peak Performance to Your GM Truck or SUV
Is your 2004 GMC Yukon, Sierra, Silverado, or other GM vehicle suffering from perplexing issues like a persistent check engine light, poor engine performance, stalling, or a no-start condition? The problem often lies with a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine, transmission, and emissions systems. This replacement ECM, part number 12586242, is the definitive solution to get your vehicle running smoothly and reliably again.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. Upon purchase, we require your vehicle’s Vehicle Identification Number (VIN) to program the module with the latest, most up-to-date software directly from General Motors. This critical step ensures that the ECM communicates perfectly with your specific vehicle’s components, retaining all original functions and optimizing performance. It’s a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
From the Diagnostic Bay
We had a 2004 Silverado 1500 towed in that had its owner chasing his tail for weeks. The truck would randomly stall and refuse to restart, and the gauges would go haywire. He had already replaced the fuel pump and crankshaft position sensor based on forum advice. He was convinced he needed a new ECM. Before ordering one, we did a full diagnostic check. We found no communication with the module. Instead of a faulty computer, we discovered the main engine-to-chassis ground strap, located on the back of the passenger side cylinder head, was corroded and barely making contact. After cleaning the contact points and tightening the strap, the truck fired right up and all the issues were gone. Always check your main power and ground connections before condemning an expensive electronic module!
Common Symptoms of a Failing GM ECM
- ✔ Check Engine Light is on with various communication or sensor-related trouble codes (DTCs).
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start condition where the engine cranks but will not fire.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inability to communicate with the ECM using a diagnostic scan tool.
- ✔ Intermittent loss of power to other vehicle systems.
Why Choose a VIN-Programmed 2004 Yukon ECM?
Installing a generic, non-programmed module from a junkyard or parts store will not work. Modern GM vehicles utilize a sophisticated anti-theft system (Passlock/VATS) that is tied to the ECM and the vehicle’s VIN. Our programming service handles this for you, making installation as straightforward as possible. While a simple security relearn procedure may be necessary after installation (a 30-minute key-on/key-off process), our programming does the heavy lifting, saving you a costly trip to the dealership. This ensures your 2004 Yukon ECM functions exactly as the original did from the factory, but with the benefit of the latest software improvements from GM.
Installation is simple for a DIY mechanic. Typically located under the battery tray on the driver’s side frame rail or next to the airbox, the ECM is held in by a few bolts. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, swap it with your new pre-programmed unit, reconnect everything, and perform the security relearn if needed. You’ll be back on the road in no time, with the confidence that the brain of your engine is functioning perfectly.
Frequently Asked Questions
What do I need to do after I place my order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot ship your part until we have this information, as the programming is specific to your exact vehicle.
Is this part truly plug-and-play?
For most vehicles, yes. We program the module to your VIN, which handles most of the setup. However, you may need to perform a simple security relearn procedure, which involves turning the key on and off in a specific sequence for about 30 minutes. Instructions are readily available online for this process. No expensive scan tools are required.
How can I be sure this ECM will fit my vehicle?
This module fits a wide range of 2004 GM trucks and SUVs. The best way to confirm compatibility is to match the service number on your original ECM to one of the numbers listed in our description (e.g., 12586242, YFKF, etc.). If you are unsure, please contact us with your VIN before ordering.
Will this fix my specific problem or check engine light?
This replacement ECM will resolve any issues directly caused by a faulty original module. If your check engine light is on due to ECM failure or internal processing errors, this will correct it. However, it will not fix problems caused by other faulty components like sensors, wiring, or mechanical parts.
Do I need to return my old ECM?
No core charge is required for this part. You do not need to send your old, faulty computer back to us.