Is Your Yukon XL Running Rough, Stalling, or Refusing to Start?
There’s nothing more frustrating than a vehicle you can’t depend on, especially a workhorse like your 2004 GMC Yukon XL 2500. If you’re dealing with a persistent Check Engine Light, unpredictable stalling, poor fuel mileage, or harsh shifting, a failing Powertrain Control Module (PCM) is often the culprit. Don’t let a faulty computer sideline your truck. This fully programmed 2004 Yukon XL 2500 PCM 12586243 is the reliable, straightforward solution to get you back on the road with confidence.
Common Symptoms of a Failing GM PCM & Your Solution
A vehicle’s PCM is its brain, controlling everything from fuel mixture and spark timing to transmission shift points. When it fails, it can cause a wide range of confusing and intermittent problems. Look out for these common warning signs:
- Check Engine Light: You may see diagnostic trouble codes (DTCs) like P0601, P0602, P0604, or P0606, which point directly to an internal module failure.
- No-Start or Hard-Start: The engine cranks but won’t fire up, or takes an excessively long time to start.
- Erratic Engine Performance: Unexplained stalling, rough idling, hesitation during acceleration, and a noticeable loss of power.
- Poor Fuel Economy: A sudden and significant drop in your MPG can be caused by the PCM failing to manage the engine efficiently.
- Transmission Issues: The module may fail to communicate with the transmission, leading to harsh, delayed, or incorrect shifting.
This replacement module is the definitive fix for these issues. We program it using your vehicle’s specific VIN, ensuring it’s a perfect match that restores the performance and reliability you depend on.
Features & Benefits
- โ Plug-and-Play Installation: This module arrives pre-programmed to your vehicle’s exact VIN. No expensive trips to the dealership for coding are required.
- โ Updated GM Software: We flash the unit with the latest software updates from General Motors, ensuring optimal engine performance, fuel efficiency, and emissions compliance.
- โ Guaranteed Compatibility: A direct replacement for part numbers 12586243 and 89017739, guaranteeing a perfect fit and function for your 2004 Yukon XL and other compatible GM vehicles.
- โ Restores Peak Performance: By correcting engine and transmission management, this PCM helps restore lost horsepower, smooth out your idle, and improve throttle response.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
From the Technician’s Bench: Why VIN Programming is Non-Negotiable
On these early 2000s GM trucks, the PCM is deeply integrated with the vehicle’s security system (VATS/Passlock), transmission type, and specific options like gear ratios. Simply installing a generic or junkyard module won’t workโthe truck won’t start due to a security mismatch. Our VIN-specific programming ensures the new PCM communicates flawlessly with all other modules in your truck right out of the box. We’re not just selling you a part; we’re providing a complete solution that saves you the time, cost, and headache of a tow to the dealer.
Frequently Asked Questions
Do I need to do any additional programming after installation?
No. This module comes fully programmed to your vehicle’s VIN. In most cases, it is a direct plug-and-play installation. On some vehicles a security relearn procedure may be required, which is a simple process you can do yourself in 15-20 minutes with just the ignition key.
Where do I provide my vehicle’s VIN?
After you complete your purchase, we will send you an email requesting your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as it is essential for the programming process.
Is this the correct part for my vehicle?
This module, part number 12586243, is specified for the 2004 GMC Yukon XL 2500 and a wide range of other 2004 GM vehicles. Please check the part number on your original module and consult our fitment list to confirm compatibility before ordering.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECM (Engine Control Module) typically refers to a computer that only controls engine functions. PCM (Powertrain Control Module) controls both the engine and the transmission. ECU (Engine Control Unit) is a more general term. For this application, the part functions as the central powertrain computer.
What tools are needed for installation?
Installation typically requires only basic hand tools, such as a socket set and ratchet, to access and unbolt the module. The most important first step is to disconnect the vehicle’s battery before you begin.