Is Your 2004 Yukon XL Running Rough? The PCM Might Be the Culprit.
If your 2004 GMC Yukon XL 2500 is suffering from persistent check engine lights, erratic shifting, poor fuel economy, or even a no-start condition, a failing Powertrain Control Module (PCM) is a very common cause. As the central computer of your vehicle, the PCM is responsible for managing everything from the engine’s air-fuel mixture and ignition timing to the transmission’s shift points. When it begins to fail, it can create a cascade of frustrating and difficult-to-diagnose problems. This replacement PCM, part number 12586242, is the definitive solution to restore your truck’s performance and reliability.
From the Diagnostic Bay
We once had a 2004 Sierra with the 6.0L engine come into the shop with a complaint of intermittent stalling and a random misfire code (P0300) that mechanics had been chasing for weeks. They had replaced plugs, wires, coils, and even the crankshaft position sensor to no avail. After hooking up our scanner and monitoring live data, we noticed the injector pulse width and ignition timing data would briefly drop out just before a stall. This pointed directly to the processor inside the PCM. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran perfectly. The customer had spent hundreds on parts they didn’t need when the root cause was the vehicle’s main computer.
Direct-Fit Solution for Your 2004 Yukon XL 2500 PCM
Don’t let a faulty computer keep your powerful truck sidelined. This unit is a direct replacement for your original module and is guaranteed to be compatible with a wide range of GM vehicles from that era. We take the guesswork and hassle out of the repair by programming the module specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that all factory settings, engine parameters, and anti-theft systems work seamlessly upon installation. The module arrives at your door flashed with the latest GM software updates, often correcting underlying drivability issues you may not have even known were software-related.
Common Symptoms of a Failing PCM:
- ✔ Check Engine Light is on with various fault codes (e.g., U-codes, P0601-P0606)
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Reduced fuel economy
- ✔ The vehicle won’t start, but the battery and starter are good
- ✔ Communication errors with diagnostic scan tools
- ✔ Inconsistent or non-functional gauges
This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits a broad selection of 2004 GM models including the Sierra, Silverado, Escalade, Tahoe, Suburban, Hummer H2, and more. Simply provide your VIN at checkout, and we’ll handle the programming, making installation as simple as possible.
Frequently Asked Questions
Do I need to have this programmed by a dealer?
No. We handle all the programming for you before shipment. We use your vehicle’s VIN to load the correct GM-certified software and updates, so it arrives ready for installation. This saves you a trip to the dealership and the high cost of their programming services.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. It contains critical information about the specific options, engine, transmission, and emissions systems your vehicle was built with. Providing us with your VIN is essential for us to program the PCM with the exact software your vehicle requires to run correctly.
Is installation difficult?
For most DIY mechanics, the physical installation is straightforward. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then reversing the process with the new unit. After installation, you may need to perform a simple security relearn procedure (often called a CASE relearn), which can usually be done without special tools. Instructions are widely available online for this process.
Will this fix my check engine light?
If the check engine light and associated fault codes are being caused by a faulty PCM, then yes, this part will resolve the issue. However, if there are other failing sensors or mechanical problems with your vehicle, those issues will still need to be addressed separately.
How do I find my original part or service number?
You can find the service number on the sticker of your original PCM. It is typically a silver sticker with multiple barcodes. Matching your number to one of the compatible numbers listed (e.g., 12586242, YFKH) ensures you are ordering the correct hardware.