Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 Silverado 1500, Sierra, Tahoe, or another GM vehicle experiencing frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission shifting, leaving you with an unreliable and inefficient truck. This replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s original performance and reliability.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and additional expense out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that all factory settings, software, and the latest GM updates are loaded before it ever ships. This critical step guarantees seamless communication between the new PCM and all other modules in your vehicle, providing a true plug-and-play repair experience.
From the Diagnostic Bay
We had a 2004 Sierra 1500 come in with a bizarre set of symptoms: intermittent stalling at red lights and a transmission that refused to shift out of second gear on hot days. The owner had already replaced the throttle body and a transmission solenoid with no luck. After scanning, we found no hard codes, just confusing data from the PCM. We suspected an internal PCM failure due to heat soak. Installing a VIN-programmed module like this one solved both problems instantly. The customer was thrilled to have his reliable truck back without wasting any more money on incorrect diagnoses.
Diagnosing a Faulty 2004 Silverado 1500 PCM
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following issues, your PCM is a likely culprit. Verifying the part number on your original module is the first step toward a correct diagnosis. This unit is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
Common Symptoms of PCM Failure
- ✔ Check Engine Light is illuminated, often with communication-related error codes (U-codes) or multiple random codes.
- ✔ Engine stalling, hesitation, or stumbling during acceleration.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect transmission shifting patterns.
- ✔ Complete no-start condition where the engine cranks but will not fire.
- ✔ Failure to pass state emissions testing.
Guaranteed Compatibility and Simple Installation
This Electronic Control Module is compatible with a wide array of 2004 GM vehicles, including the Chevrolet Silverado, Sierra 1500/2500/3500, Tahoe, Suburban, Avalanche, SSR, Trailblazer EXT; GMC Yukon, Envoy XL/XUV; Cadillac Escalade; Hummer H2; Buick Rainier; and Isuzu Ascender. For most trucks like the Silverado and Sierra, the PCM is conveniently located on the driver’s side, under the battery tray. While the physical replacement is straightforward, please note that a security relearn procedure (often called a CASE relearn) will be necessary after installation. This procedure can typically be performed without special tools and instructions are readily available online.
By providing us with your vehicle’s VIN at checkout, you ensure that you receive a module that is perfectly matched to your engine, transmission, and factory options. Get your truck back on the road quickly and confidently with a reliable, pre-programmed engine computer.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. We load the latest software updates from GM, making it ready for installation right out of the box.
What is a security relearn procedure?
After installation, your vehicle’s anti-theft system (PassLock/VATS) needs to synchronize with the new PCM. This is a simple procedure that usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the systems to communicate and authorize the new module.
How do I find my original part number?
Your original PCM will have a sticker on it with the service number. On a 2004 Silverado, it’s typically located under the hood on the driver’s side, near the battery. The number will be one of the compatible IDs listed, such as 12586242 or YFXL.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. It’s crucial to ensure a proper diagnosis has been performed, as the check engine light can be triggered by many other failing components.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is considered plug-and-play. You will only need to perform the standard security relearn procedure after installation for the vehicle to start and run correctly.