Get Your Truck Running Like New Again
Is your 2004 Sierra 2500, Silverado, or other GM vehicle suffering from frustrating engine problems? A faulty Powertrain Control Module (PCM) can bring your workhorse to a grinding halt, causing everything from a no-start condition to poor fuel economy and erratic shifting. This isn’t just an inconvenience; it’s downtime that costs you time and money. Get back on the road with confidence with this direct-fit, professionally programmed 2004 Sierra 2500 PCM 12586242, the reliable heart of your vehicle’s engine management system.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing PCM is the likely culprit:
- Check Engine Light is on with communication-related trouble codes (DTCs).
- Engine cranks but refuses to start.
- Rough idling, stalling, or hesitation during acceleration.
- Noticeable decrease in fuel efficiency.
- Harsh or unpredictable automatic transmission shifting.
- Apparent loss of spark or fuel injector pulse.
This unit is the definitive solution. We take a genuine OEM module and flash it with the latest, most stable GM-approved software calibration for your specific Vehicle Identification Number (VIN). This ensures that once installed, it communicates perfectly with your truck’s entire system, restoring the performance and reliability you depend on.
Features & Real-World Benefits
- โ VIN-Programmed for Your Truck: We flash the module to your exact VIN before shipping. This eliminates the need for an expensive trip to the dealership for programming, making for a straightforward installation.
- โ Loaded with Latest GM Updates: Your PCM will arrive with the newest software updates from General Motors, which can solve factory bugs and improve engine and transmission performance.
- โ Guaranteed Compatibility: This module is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for a wide range of 2004 GM trucks and SUVs.
- โ Simple Plug & Play Installation: Once you receive the unit, simply disconnect your battery, swap the old module with this one, and reconnect the battery. For most vehicles, it’s that simple. (Note: A security relearn or CASE relearn may be required).
- โ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming: Don’t settle for a generic or used computer that hasn’t been properly matched to your vehicle. A truck like the Sierra 2500 has specific parameters for its engine, transmission, and options. Our VIN-specific programming for the 2004 Sierra 2500 PCM 12586242 ensures every component works in harmony, just as the factory intended. This is the key to a lasting, reliable repair, not a temporary fix.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add this as a note during checkout or send it to us through the platform’s messaging system. We cannot ship your part until we receive your VIN.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is straightforward. The PCM is usually located in the engine bay (on the LH side, under the battery or next to the airbox). The main steps are disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and then reversing the process. No special tools are typically required.
Will I need to do anything after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles require a security relearn procedure (often called Passlock or VATS) which can be done without special tools. A Crankshaft Variation Relearn (CASE relearn) may also be needed to clear a specific trouble code, which requires a capable scan tool.
How can I be sure this fits my vehicle?
This 2004 Sierra 2500 PCM 12586242 fits a wide variety of GM vehicles from 2004. The best way to confirm is to match the service number on your current computer to one of the numbers listed in our description (e.g., 12586242, YFXL, YFKD). If you are unsure, please contact us with your VIN before ordering.
Is this a new or used part?
This is a professionally serviced, genuine OEM part that has been inspected, tested, and programmed with the latest software to ensure it meets or exceeds original factory specifications for performance and reliability.