Restore Peak Performance to Your 2004 GM Vehicle
Is your 2004 Cadillac Escalade, Sierra, Silverado, or another compatible GM truck or SUV suffering from frustrating engine issues? A faulty Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is a common culprit behind poor performance, erratic behavior, and no-start conditions. This module is the central brain of your vehicle’s engine, managing everything from fuel mixture and ignition timing to transmission shifting and emissions control. When it fails, your vehicle’s reliability and drivability are compromised.
This is a direct replacement for GM part number 12586242. It is a reliable solution, professionally programmed with the latest GM factory software updates. We flash the computer specifically to your vehicle’s unique Vehicle Identification Number (VIN), ensuring it works seamlessly with your existing systems right out of the box. This eliminates the need for an expensive trip to the dealership for programming.
Expert Pro Tip: Before installing a replacement PCM, always inspect, clean, and tighten your vehicle’s main battery terminals and engine ground straps. A weak or corroded ground connection can cause voltage irregularities that mimic PCM failure and can potentially damage the new module upon installation.
Diagnosing a Faulty 2004 Escalade Engine Computer
The symptoms of a failing PCM can often be mistaken for other component failures. If you’re experiencing several of the issues below, your engine computer is a likely cause. Replacing it with our pre-programmed unit can resolve these complex electronic problems and get you back on the road with confidence.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various or no specific codes.
- ✔ Engine misfires, stumbles, or runs rough.
- ✔ Vehicle fails to start or has difficulty starting (hard start).
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent stalling for no apparent reason.
Our process is simple and designed for the DIY mechanic or professional shop. After placing your order, simply provide us with your vehicle’s VIN. Our technicians will program the module to match your exact configuration, including engine type, transmission, and emissions equipment. The module you receive will be a true plug-and-play solution. This unit is a direct replacement for service numbers including 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN (Vehicle Identification Number) is essential for programming the engine computer correctly. It contains specific information about your vehicle’s engine, transmission, emissions systems, and other factory-installed options. Programming the PCM with your VIN ensures it communicates perfectly with all other modules in your vehicle, making the installation plug-and-play.
Is this part difficult to install?
For most 2004 GM trucks and SUVs, the PCM is located in the engine bay, either next to the airbox or under the battery tray. Installation typically involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in the reverse order. It’s a straightforward process for someone with basic mechanical skills. However, we always recommend consulting a repair manual for your specific vehicle.
Will I need to do any additional programming after installation?
No. This module arrives fully programmed to your VIN and is ready for installation. In most cases, you will not need any further programming. Some vehicles may require a security relearn procedure (CASE learn), which can often be completed without special tools. Instructions are widely available online for this simple procedure.
What is the warranty on this engine computer?
This part comes with a comprehensive warranty to give you peace of mind. Please refer to the warranty information section on this page for specific details regarding coverage and duration.
How do I confirm this is the correct part for my vehicle?
Please match the part number 12586242 or one of the listed service numbers (e.g., YHTN, YFKD) from your original computer. You can also use the detailed fitment list on this page to confirm compatibility with your year, make, and model. If you are still unsure, please contact us with your VIN, and we will be happy to verify the correct fitment for you.