Restore Your Truck’s Power and Reliability
Is your 2004 Sierra, Silverado, or other GM truck running rough, stalling unexpectedly, or showing a persistent Check Engine light? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and concerning issues. This isn’t just a replacement part; it’s the definitive solution to restore your vehicle’s original performance and dependability. This unit, with service number 12586242, arrives at your door fully programmed to your specific vehicle using your VIN, ensuring a seamless and straightforward installation process.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the likely cause. This module is the direct fix for issues such as:
- Erratic engine performance, misfires, or stalling
- Poor fuel economy
- Failure to pass emissions testing
- Transmission shifting problems
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0606
- Complete no-start condition
Don’t let a bad computer keep your truck off the road. Our pre-programmed 2004 Sierra 1500 PCM 12586242 is the reliable, cost-effective alternative to an expensive dealership visit.
Features & Benefits
- ✔ Plug & Play Installation: This unit is professionally flashed with the latest GM software updates specifically for your vehicle’s VIN. No expensive dealer programming required.
- ✔ Restored Performance: Corrects common running issues, improves fuel efficiency, and ensures smooth transmission shifting by restoring the brain of your vehicle.
- ✔ Guaranteed Compatibility: This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for a wide range of GM trucks and SUVs.
- ✔ Built for Durability: Sourced to meet or exceed original equipment specifications for long-lasting reliability under the toughest conditions.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: Why a VIN-Programmed PCM Matters
As a technician, I’ve seen countless truck owners try to save a few dollars with a junkyard PCM, only to end up with a vehicle that won’t start or runs even worse. The P59 controller used in these 2004 GM vehicles is complex; it manages everything from fuel injectors to the transmission. More importantly, it’s tied to your specific vehicle’s security system (Passlock/VATS) and options. Simply swapping a used computer won’t work. Our service eliminates that entire headache. By programming the 2004 Sierra 1500 PCM 12586242 to your VIN before we ship, we ensure all factory settings are correct, making the security relearn process simple and getting you back to work faster.
Frequently Asked Questions
Do I need to send you my old computer?
No, there is no core charge or need to send your original unit back to us. This is a direct purchase.
What information do you need from me?
After you complete your purchase, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it.
Is any additional programming required after installation?
After installing the PCM, you will need to perform a security relearn procedure, often called a CASE relearn or Passlock relearn. This procedure syncs the new computer with your vehicle’s anti-theft system and can typically be done without special tools. Instructions are widely available online or in service manuals.
How do I find my correct part number?
Your original PCM will have a sticker with the service number on it. This unit is a direct replacement for service number 12586242 and many other compatible numbers listed in the full description. As long as your vehicle is on the fitment list, this module will work once programmed to your VIN.
Will this fix my specific problem?
This PCM corrects issues directly caused by a failing computer. While it is the solution for many common engine and transmission problems, we always recommend having a proper diagnosis performed by a qualified mechanic to confirm the PCM is the point of failure before ordering.