Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 Yukon XL 2500, Sierra, or Escalade suffering from erratic behavior, a persistent check engine light, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it falters, the entire vehicle’s performance and reliability are compromised.
This is a direct replacement PCM, service number 12586242, designed to solve those frustrating issues. We take the guesswork out of the repair process. Upon purchase, simply provide us with your vehicle’s VIN. Our technicians will then program the module with the latest, most stable software updates directly from GM. This ensures that the computer is perfectly calibrated for your specific vehicle configuration, restoring factory performance, fuel economy, and drivability. It arrives at your door ready for a straightforward installation.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come in with a P0300 (Random Misfire) code that just wouldn’t go away. The owner had already replaced the spark plugs, wires, and even a couple of ignition coils. The misfire was intermittent but getting worse. After confirming fuel pressure and checking for vacuum leaks, we hooked up our diagnostic scanner and monitored the live data. We noticed that the fuel trim values on Bank 2 were behaving erratically, not responding correctly to engine load. This pointed away from a mechanical issue and toward the controller. We swapped in a known-good, programmed PCM, and the truck ran perfectly. The original PCM had a failing driver circuit that was causing the misfire. It’s a great reminder that when you’ve chased all the common culprits, sometimes the problem lies with the brain itself.
Is a Failing PCM Causing Your Problems?
A faulty 2004 Yukon XL PCM can manifest in numerous ways. If you’re experiencing any of the following, a failing engine computer could be the root cause:
- ✔ Check Engine Light: The most common symptom, often with communication-related or processor fault codes.
- ✔ Poor Fuel Economy: Incorrect fuel and air calculations lead to wasted gas.
- ✔ Engine Stalling or Misfiring: The PCM may fail to correctly fire the ignition coils or fuel injectors.
- ✔ Harsh or Failed Shifting: The module plays a critical role in controlling the automatic transmission’s shift points.
- ✔ No-Start Condition: The engine may crank but will not start if the PCM isn’t managing fuel and spark.
- ✔ Failed Emissions Test: Improper engine management will prevent the vehicle from passing smog inspections.
Guaranteed Compatibility and Simple Installation
This module is a guaranteed fit for a wide range of 2004 GM vehicles. It is a direct replacement for service numbers 12586242, 19299226, 89017738 and broadcast codes including YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. This unit is compatible with models such as the Sierra 1500/2500/3500, Silverado 1500/2500/3500, Tahoe, Suburban, Escalade, Hummer H2, Trailblazer EXT, Envoy XL/XUV, Rainier, and SSR. Please verify your original part number or service ID to ensure a perfect match.
The key to a successful repair is our VIN programming service. By flashing the module specifically to your truck, we eliminate the need for expensive dealership visits for programming. Once installed, you may need to perform a simple security relearn procedure (often called a CASE relearn), which can typically be done in your driveway without special tools. This syncs the new PCM with your vehicle’s anti-theft system.
Frequently Asked Questions about the 2004 Yukon XL PCM
What exactly does the PCM do in my truck?
The Powertrain Control Module (PCM) is the main computer that controls all aspects of your vehicle’s engine and transmission. It reads data from dozens of sensors to manage fuel delivery, spark timing, transmission shifting, and emissions systems to ensure optimal performance, efficiency, and reliability.
Is this module truly plug-and-play?
Almost. Because we program it to your vehicle’s specific VIN, it is ready to be installed and function correctly. However, on most GM vehicles of this era, you will need to perform a security relearn procedure after installation. This syncs the new computer to your vehicle’s anti-theft system and keys. This procedure is simple and can usually be done without any special tools.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. You can typically find your VIN on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents. We cannot ship your part until we receive the VIN.
How can I be sure this part number fits my vehicle?
The best way is to check the service number on your original computer. This module replaces part number 12586242 and many others listed in the description. If your vehicle is a 2004 GM truck or SUV and your original module has one of the listed service numbers or broadcast codes, this part is the correct fit.
What if I have issues after installation?
First, ensure the security relearn procedure has been completed successfully. Double-check all electrical connections to the PCM. If you still experience issues, it’s important to verify that the root cause of the original failure has been addressed (e.g., a shorted sensor or wire that could damage the new module). Our customer support is here to help you troubleshoot the process.