Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 GMC Sierra 1500, Silverado, or other GM vehicle plagued by a persistent check engine light, erratic shifting, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. Don’t let a faulty computer keep your reliable truck off the road. This replacement PCM is the definitive, hassle-free solution to restore your vehicle’s factory performance and dependability.
Common Symptoms & Your Solution
A failing PCM can cause a cascade of issues that are often misdiagnosed. If you’re experiencing any of the following, this module is the solution you need:
- Persistent Check Engine Light: Especially with communication error codes like P0601, P0602, P0605, or P0606.
- Rough or Unstable Idle: The engine struggles to maintain a consistent RPM at a stop.
- Poor Fuel Economy: A sudden, unexplained drop in your truck’s MPG.
- Harsh or Failed Shifting: The transmission may shift erratically, get stuck in gear, or fail to engage properly.
- Engine Stalling or No-Start: The vehicle may stall intermittently or refuse to start at all, even with a good battery and starter.
This unit is a direct replacement for service number 12586242 and is pre-programmed to your vehicle’s unique VIN. This critical step ensures that when you install your new 2004 Sierra 1500 PCM, it communicates perfectly with your truck’s existing systems, just as the original did from the factory.
Features & Benefits
- ✔ Plug-and-Play Installation: Arrives programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming or special tools.
- ✔ Updated GM Software: Flashed with the newest factory software updates from GM to ensure optimal performance, fuel efficiency, and emissions control.
- ✔ Guaranteed Compatibility: A direct replacement for service number 12586242 and a wide range of other GM part numbers (including YFKD, YFKF, YFKH, YFKJ, YFKX, and more), ensuring a perfect fit for your truck or SUV.
- ✔ Solves Complex Issues: Corrects frustrating problems like check engine lights, rough idling, poor shifting, and no-start conditions related to a faulty computer.
- ✔ One-Year Replacement Coverage: This unit is backed by our one-year replacement warranty, giving you confidence in your purchase.
A Technician’s Insight: The Power of Proper Programming
As a technician with over two decades of experience, I’ve seen countless drivers waste time and money on used computers that aren’t properly matched to their vehicle. A PCM is the brain of your truck; it controls everything from the engine’s fuel mixture to the transmission’s shift points. Our process of programming this 2004 Sierra 1500 PCM with your exact VIN and the latest GM software ensures all vehicle-specific systems, including anti-theft and optional equipment, function exactly as the factory intended. It’s the difference between a temporary patch and a lasting repair that restores your confidence behind the wheel.
Simple Ordering Process
- Confirm this part (service # 12586242 or a compatible number) matches the one in your vehicle.
- Complete your purchase.
- Provide us with your vehicle’s VIN when prompted.
- We program the module and ship it directly to you, ready for installation.
By providing a fully programmed module, we help you get your truck back to work or back to handling family duties quickly and correctly. Restore the reliability you depend on with a properly prepared 2004 Sierra 1500 PCM.
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function.
Is any additional programming required after I install it?
No. This PCM arrives fully programmed to your VIN and is ready for installation. In most cases, a security relearn procedure may be required, which is a simple process that can be done without special tools. Instructions are typically included.
How can I find my original part number?
The service number is printed on a sticker on the original PCM itself. On most 2004 GM trucks, it’s located under the hood, on the driver’s side, near the battery. You should see a number like ‘12586242‘ on the label.
What happens if I install this without it being programmed to my VIN?
The vehicle will not start or run correctly. The VIN programming links the PCM to your truck’s specific components and anti-theft system. This is why we perform this critical service for you before shipping.
Will this computer fix my transmission shifting problems?
If the shifting problems are caused by a faulty PCM, then yes, this part is the correct solution. The PCM controls the transmission’s electronic solenoids and shift points. However, mechanical issues within the transmission itself would not be corrected by replacing the PCM.