Is Your Truck Running Rough? Get Back on the Road with Confidence.
There’s nothing more frustrating than when your dependable GM truck or SUV starts acting up. Whether you’re dealing with a no-start condition, erratic shifting, a persistent check engine light, or failing an emissions test, the problem often points to a failing Powertrain Control Module (PCM). As the brain of your vehicle, a faulty PCM can cause a cascade of issues, leaving your workhorse sidelined. This is the definitive solution to restore your vehicle’s performance and reliability.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing engine computer is the likely culprit:
- Engine stalling or misfiring
- Difficulty starting or a complete no-start condition
- Poor fuel economy
- Harsh or incorrect transmission shifting
- Check Engine Light (CEL) with communication-related codes (e.g., U-codes)
- Failure to pass state emissions testing
This module, a direct replacement for service number 12586242, is the reliable fix you need. We take the guesswork and hassle out of the repair by pre-programming it specifically for your vehicle using your VIN. It arrives ready for installation, loaded with the latest software updates from GM.
Features & Real-World Benefits
- ✔ Plug & Play Installation: This unit is programmed to your vehicle’s unique VIN before it ships. This means no expensive trips to the dealership for programming—saving you time and money.
- ✔ Updated GM Software: We flash the module with the most current GM calibrations, ensuring optimal engine performance, fuel efficiency, and transmission strategy.
- ✔ Guaranteed Compatibility: This PCM is a direct fit for a wide range of 2004 GM trucks and SUVs. It correctly replaces multiple service numbers including 89017738, 19299226, YFKD, YFKF, YFKH, and more.
- ✔ Rigorously Inspected: Each module is thoroughly inspected to ensure it meets strict quality standards for performance and longevity, giving you a dependable part for your vehicle.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
As a technician with over 20 years of experience, I’ve seen countless issues arise from improperly matched control modules. Simply grabbing a used computer from a junkyard won’t work. Modern GM vehicles have sophisticated anti-theft systems (Passlock/VATS) and specific calibrations for the engine, transmission, and even tire size. Our VIN-specific programming ensures all these systems communicate perfectly from the moment you plug it in. This prevents no-start security lockouts and guarantees your transmission shifts exactly as the factory intended. You’re not just buying a part; you’re buying a complete, vehicle-specific solution. This is the key to a successful, lasting repair for your 2004 Sierra 2500 PCM 12586242.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before we ship the part. All you need to do is provide us with your vehicle’s 17-digit VIN during or after checkout. The module will arrive ready for installation.
Where is the PCM located on my 2004 GM vehicle?
On most trucks like the Sierra, Silverado, and Suburban, the PCM is located in the engine bay on the driver’s side, under the battery tray. On SUV models like the Trailblazer and Envoy, it’s typically found next to the air filter box. Always disconnect the battery before removal and installation.
Will this computer fix my specific problem?
If your vehicle’s issues have been correctly diagnosed as a faulty PCM, this part is the solution. It is designed to resolve problems caused by a failing engine computer. We always recommend confirming the diagnosis before ordering, as other sensors or wiring issues can sometimes cause similar symptoms.
Is this installation difficult?
For someone with basic mechanical skills, this is a straightforward job. It typically involves disconnecting the vehicle’s battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in the reverse order. No special tools are usually required.
How do I know if this part number is correct for my truck?
This module, 12586242, replaces a wide range of original service numbers. Please check the fitment list on this page or verify the service number on your current computer’s sticker. If you’re unsure, send us your VIN, and we’ll be happy to confirm compatibility for you.
