Is Your 2004 GM Truck Running Rough?
The Powertrain Control Module, or PCM, is the electronic brain of your vehicle’s engine. It controls critical functions like fuel mixture, ignition timing, and transmission shifting. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. If you’re dealing with a persistent check engine light, poor performance, or intermittent stalling, a faulty PCM could be the culprit. This replacement module, part number 12586242, is the definitive solution to restore your truck’s reliability and performance.
From the Diagnostic Bay
We had a 2004 Sierra 1500 in the shop that was driving the owner crazy. It would randomly stall at stoplights, but only when warm. There were no consistent trouble codes, just a vague history of communication errors. After hours of checking wiring and sensors, we swapped in a known-good PCM. The problem vanished instantly. The original module’s internal circuits were failing under heat, a common issue for these units after years of service. Replacing the module was the only correct fix.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various communication or sensor codes (U-codes, P-codes).
- ✔ Engine stalls, stumbles, or misfires intermittently.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle won’t start, but the battery and starter are good.
- ✔ Failure to pass an emissions test.
- ✔ Other warning lights on the dash appear without reason.
The Right Solution for Your 2004 Silverado 2500 PCM
Don’t settle for a generic, unprogrammed module from a salvage yard. This unit is a direct-fit replacement for your original computer and is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest GM-certified software updates, which can correct factory bugs and improve overall engine and transmission performance. This ensures that once installed, your vehicle will operate exactly as the manufacturer intended. The process is simple: provide your VIN after purchase, and we handle all the programming before shipping it to your door.
This module is a direct replacement for service numbers 12586242, 19299226, and 89017738, and fits a wide array of 2004 GM vehicles including the Chevrolet Silverado, Tahoe, Suburban, GMC Sierra, Yukon, Cadillac Escalade, and more. Please verify your original part number or service ID to ensure compatibility.
Frequently Asked Questions
What exactly does the PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It takes data from sensors all over the engine and transmission to control fuel injection, spark timing, emissions systems, and automatic transmission shift points to ensure optimal performance and efficiency.
Is this module ready to install out of the box?
Yes! We program the module with your vehicle’s VIN and the latest GM software before it ships. This makes the installation process much simpler, as the module is already matched to your truck’s specific configuration.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Will I need to perform any other procedures after installation?
In many cases, you may need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This can often be done with a capable scan tool and is a standard procedure when replacing a PCM on these vehicles to ensure proper communication with the anti-theft system and other modules.
How do I know if this part number is correct for my vehicle?
The best way to confirm compatibility is to match the service number on your original computer to one of the numbers listed: 12586242, 19299226, 89017738, or the various service IDs like YFKD, YFKF, YFKH, etc. Our extensive fitment list also covers the compatible models.