Is your 2004 GM truck or SUV running poorly, stalling, or showing a persistent check engine light?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle. It manages everything from fuel delivery and ignition timing to transmission shifting and emissions controls. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable truck off the road. This is a direct-fit, expertly serviced replacement PCM that restores your vehicle’s performance and reliability.
This unit, service number 12586242, is the definitive solution for a wide array of 2004 GM models, including the GMC Yukon XL 2500, Sierra, Chevy Silverado, Tahoe, Suburban, Escalade, and more. The most significant benefit is that we program the module specifically to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This process installs the latest, most stable software updates from GM, ensuring optimal performance and compatibility. This eliminates the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2004 Sierra 1500 towed in that would crank but never start. The owner had already replaced the fuel pump and the crank position sensor, spending hundreds of dollars with no success. After connecting our diagnostic scanner, we couldn’t establish communication with the engine computer—a classic sign of PCM failure. We verified the PCM was receiving power and ground, confirming the module itself was the issue. We installed a VIN-programmed unit just like this one, performed the quick security relearn procedure, and the truck fired up on the first try. This part saved the customer from needlessly replacing more components.
Is Your Vehicle Showing These Signs of PCM Failure?
- ✔ The Check Engine Light is illuminated, often with communication-related trouble codes (like U0100).
- ✔ Your engine cranks over but refuses to start.
- ✔ You’re experiencing a sudden drop in fuel economy or a rough, unstable idle.
- ✔ The automatic transmission is shifting harshly, erratically, or not at all.
- ✔ The engine stalls intermittently, especially after warming up.
- ✔ Your vehicle fails an emissions or smog test.
- ✔ You notice other random electrical issues or warning lights.
A Simple, Programmed Solution for Your 2004 Yukon XL 2500 PCM
Replacing the PCM on these vehicles doesn’t have to be a complicated ordeal. Our process is designed to be as straightforward as possible. Once you place your order, simply provide us with your vehicle’s VIN. Our technicians will then flash the module with the correct factory software for your specific build. When you receive the part, the physical installation is typically simple, involving disconnecting the battery, unplugging the old module, and plugging in the new one. In most cases, you will need to perform a security relearn procedure (also known as an anti-theft relearn), which pairs the new PCM to your vehicle’s keys. This procedure can often be done without special tools and instructions are widely available online.
This module is a direct replacement for service number 12586242 and is also compatible with a host of other service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Verify the number on your original part to ensure a perfect match.
Frequently Asked Questions
What do I need to do after I purchase this PCM?
After your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot ship your order until we have this information, as we need it to program the module correctly for your specific truck or SUV.
Is this part difficult to install?
The physical installation is straightforward for most DIY mechanics. It typically involves disconnecting the vehicle’s battery and then swapping the electrical connectors from the old module to the new one. The most critical step after installation is the security relearn procedure, which syncs the new PCM with your vehicle’s anti-theft system.
Will this computer fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty PCM, then this replacement part is the correct solution. However, it’s essential to ensure other components like sensors or wiring have been ruled out as the cause of the problem.
How do I find my original service number?
Your vehicle’s original service number is printed on a sticker on the case of your current PCM. You will need to locate the module in your vehicle (often under the hood, near the battery or airbox) to read this number.
Does this PCM come with the latest software from GM?
Yes. We use your VIN to flash the module with the newest and most stable software version available from General Motors for your vehicle’s specific configuration. This ensures optimal engine and transmission performance.