End the Guesswork and Get Your Truck Running Right
Is your 2004 GM truck or SUV suddenly running rough, stalling, or refusing to start? A failing Powertrain Control Module (PCM) can be the source of endless frustration, leaving you with an unreliable vehicle and a persistent Check Engine light. This direct-replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s performance and reliability. It arrives at your door pre-programmed to your vehicle’s unique VIN, eliminating the need for expensive dealership trips and complex programming tools. Get back on the road with confidence and the performance you depend on.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty engine computer is the likely culprit. This programmed module is designed to solve them:
- Erratic or harsh transmission shifting
- Poor fuel economy
- Engine stalling, stumbling, or misfiring
- Failure to pass emissions testing
- No-start or hard-start conditions
- Check Engine Light with codes like P0601, P0602, P0606, or communication errors
Installing our pre-flashed 2004 Yukon XL 1500 ECM is the most effective way to correct these problems and restore your vehicle’s factory-specified operation.
Features & Tangible Benefits
- ✔ Plug & Drive Installation: Arrives pre-programmed to your vehicle’s VIN. Simply install the module and perform the security relearn procedure—no dealership visit required.
- ✔ Updated GM Software: We flash each unit with the latest software updates from General Motors, ensuring optimal fuel efficiency, emissions control, and performance.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit and function for your specific vehicle.
- ✔ Restored Drivability: A new ‘brain’ for your vehicle means smoother idling, crisp shifting, and the reliable power you need for work and family.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Heart of Your GMT800
The 2004 GM truck platform, known as the GMT800, is legendary for its durability. However, the electronics are now over two decades old. The PCM is the central command center, managing everything from fuel injection and spark timing to transmission shift points. Over time, heat cycles and vibrations can cause internal components to fail, leading to the frustrating, intermittent issues you might be seeing. Replacing a faulty original with a professionally programmed 2004 Yukon XL 1500 ECM isn’t just a repair; it’s a critical step in preserving the long-term reliability of your trusted truck or SUV.
Frequently Asked Questions
Do I need to send you my old computer?
No, there is no core charge or need to send your original module to us. This is a direct purchase.
What information do you need from me?
After you place your order, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it. Please double-check it for accuracy to ensure perfect compatibility.
Is any additional programming required after installation?
Once installed, you will need to perform a security relearn procedure, often called a “CASE relearn” or “anti-theft relearn.” This syncs the new PCM to your vehicle’s anti-theft system and can typically be done without special tools. Instructions are readily available online for your specific model, or your mechanic can perform it quickly.
How do I find my service number to confirm fitment?
Your original PCM will have a sticker on it with a 4-letter broadcast code (like YFKD, YFXL, etc.) or a longer service number (like 12586242). This unit is compatible with all the numbers listed in our fitment guide, but providing your VIN is the most foolproof way to guarantee a match.
Will this fix my specific problem?
This programmed 2004 Yukon XL 1500 ECM is a direct solution for issues caused by a failing computer. While it resolves the most common electronic problems, we always recommend a proper diagnosis by a qualified technician to rule out other potential issues like faulty wiring or sensors.
What does the warranty cover?
This unit is backed by our one-year replacement warranty, which covers any defects in the module itself. It provides a one-time replacement should the unit fail within the warranty period.