Get Your Truck Running Like New Again
Is your 2004 GM truck or SUV suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM) can be the hidden cause of everything from a no-start condition to poor fuel economy and erratic behavior. This isn’t just an inconvenience; it’s a reliability issue that keeps your workhorse off the road. This replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s performance and your confidence in it. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s specific VIN with the latest GM software updates before it ever leaves our facility. This ensures a seamless installation and gets you back in the driver’s seat faster.
Common Symptoms & Your Solution
If you’re experiencing any of the following problems, a failing PCM is the likely culprit. This unit is designed to be the direct fix for:
- Complete no-start or intermittent starting issues
- Poor or rough idling
- Reduced engine power and hesitation during acceleration
- Erratic or harsh automatic transmission shifting
- A persistent Check Engine Light with diagnostic trouble codes (DTCs) like P0601, P0602, or P0606
- Unexplained decrease in fuel mileage
By replacing your old module with this professionally programmed 2004 Yukon XL 2500 PCM, you are directly addressing the root cause of these problems and installing a reliable, updated component that manages your engine and transmission with precision.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the unit with your vehicle’s VIN, ensuring all factory options and systems communicate correctly. This makes installation straightforward and eliminates the need for an expensive trip to the dealership for programming.
- ✔ Latest GM Software Updates: Your module arrives with the most current software from General Motors, which can improve fuel efficiency, transmission shift points, and overall drivability compared to your original unit.
- ✔ Direct OEM Fitment: This unit is a direct replacement for service number 12586242 and a wide range of other compatible service numbers, guaranteeing a perfect fit in the factory location.
- ✔ Restored Engine Performance: A properly functioning PCM is critical for managing fuel delivery, spark timing, and emissions. This unit will restore your engine’s power, smoothness, and efficiency.
- ✔ One-Year Warranty Coverage: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: The Importance of the P59 Controller
The computer in your 2004 GM vehicle is known as the P59 controller. It’s the central brain for more than just the engine—it’s deeply integrated with the transmission, instrument cluster, anti-lock brakes, and even the body control module. That’s why simply buying a used 2004 Yukon XL 2500 PCM from a junkyard often leads to more problems. Without the correct VIN-specific programming, you can experience issues like the transmission being stuck in limp mode or the speedometer not working. Our professional programming service ensures that all these critical vehicle systems are properly calibrated, saving you from hours of diagnostic headaches and potential parts-swapping.
Don’t let a faulty computer dictate when and where you can drive. Installing this pre-programmed 2004 Yukon XL 2500 PCM is the most effective and reliable way to solve complex electronic issues and get your dependable truck or SUV back to performing the way it was meant to. Simply provide your VIN after purchase, and we’ll handle the rest.
Frequently Asked Questions
Do I need to do any additional programming after I receive this PCM?
No. This PCM comes fully programmed to your vehicle’s VIN. In most cases, it is a plug-and-play installation. However, some vehicles may require a security relearn procedure (often called CASE relearn or Passlock relearn), which is a simple process that can be done without special tools. Instructions are readily available online for your specific model.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as it is essential for the programming process.
How do I confirm this part is correct for my vehicle?
The best way is to match the service number on your current computer. This PCM replaces service number 12586242 and many others listed in the description. As long as your year, make, and model are on the compatibility list, providing us with your VIN will ensure a perfect match.
What tools are required for installation?
Installation is typically straightforward and requires only basic hand tools, such as a socket set and ratchet to disconnect the battery and unbolt the PCM connectors and mounting bracket. Always disconnect the battery before beginning the installation.
Will this fix my specific check engine light code?
This PCM is a direct fix for internal module failure codes like P0601 (Internal Control Module Memory Check Sum Error) and other related processor faults. If your check engine light is caused by a faulty sensor or wiring issue, this will not resolve it. Proper diagnosis is always recommended before ordering.