Is Your 2004 Yukon XL Running Rough?
If you’re experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, a failing Engine Control Module (ECM) is often the culprit. The ECM is the brain of your vehicle, controlling everything from fuel injection and ignition timing to transmission function. When it starts to fail, it can cause a wide range of problems that can be difficult to diagnose. This replacement ECM, part number 12586242, is the definitive solution to restore your truck’s performance and reliability.
From the Diagnostic Bay
We had a 2004 Sierra come into the shop with a complaint of intermittent stalling and a check engine light for a random misfire. The owner had already replaced the spark plugs, wires, and even a coil pack with no success. After hooking up our professional scan tool, we noticed the data stream from several key sensors was dropping out intermittently. This wasn’t a sensor issue; it was a processing issue inside the computer. We installed a VIN-programmed ECM, performed the security relearn, and the truck ran perfectly. It’s a classic case where chasing parts costs more time and money than addressing the root cause: a faulty engine computer.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is illuminated with various trouble codes (DTCs).
- ✔ Vehicle refuses to start or stalls unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfires, stumbles, or runs poorly.
- ✔ Loss of communication with the scan tool.
- ✔ Issues with anti-theft system engagement.
The Direct-Fit Solution for Your 2004 Yukon XL 1500 ECM
Don’t settle for a generic, unprogrammed module that will cause more headaches. This unit is a direct replacement for your original ECM and is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and calibrations for your engine, transmission, and factory options. We flash it with the latest updates from GM, which can resolve many factory-known drivability issues. This is not just a replacement part; it’s a comprehensive solution designed to get your vehicle back on the road quickly and correctly.
Installation is straightforward. Once you receive the module, you simply disconnect the battery, remove your old ECM, and install the new one. In most cases, you will need to perform a simple security relearn procedure, which can be done without any special tools and typically takes about 30 minutes. This syncs the new computer with your vehicle’s anti-theft system.
This ECM is compatible with a wide range of 2004 GM trucks and SUVs, including the GMC Sierra, Chevrolet Silverado, Tahoe, Suburban, Escalade, Hummer H2, and more. It replaces multiple service numbers, including 12586242, 19299226, 89017738, and broadcast codes like YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, and others, ensuring broad compatibility.
Frequently Asked Questions
Do I need to program this ECM?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during checkout, and we will flash the module with the correct GM software for your specific vehicle.
Is this installation plug-and-play?
Yes, the physical installation is plug-and-play. However, after installation, you will likely need to perform a security relearn procedure to sync the new ECM with your vehicle’s anti-theft system. This procedure does not require special tools and instructions are readily available online.
How do I find my original part number?
Your original part number is printed on a white or silver sticker on the case of your current ECM. It will typically be a service number like 12586242 or a 4-letter broadcast code like YFKJ.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty ECM, this part will resolve the issue. However, if there are other underlying mechanical or electrical problems with your vehicle, those will need to be addressed separately.
What information do you need from me?
After you complete your purchase, we require your 17-digit Vehicle Identification Number (VIN). This is essential for us to program the module correctly for your truck’s specific configuration.