Get Your GM Truck or SUV Back on the Road, Fast.
Is your 2004 Silverado, Sierra, Tahoe, or other GM vehicle suffering from frustrating and unpredictable engine problems? Stalling at intersections, a rough idle, poor fuel mileage, or a check engine light that won’t go away are more than just annoyancesโthey’re signs that the brain of your engine, the Powertrain Control Module (PCM), may be failing. This replacement PCM, service number 12586242, is the definitive, reliable solution to restore your vehicle’s performance and your peace of mind.
We take the guesswork and hassle out of the repair. Before this unit ships, we program it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect compatibility with your engine, transmission, and all related systems, effectively making it a plug-and-play installation. You get a component loaded with the latest GM software updates, designed to get your vehicle running smoothly again without an expensive trip to the dealership. For anyone relying on their truck for work or their SUV for family safety, this is the smart fix to get the job done right. Ensure you’re ordering the correct part for your 2004 Silverado 3500 PCM 12586242 to guarantee a perfect match.
Common Symptoms of a Failing PCM & Your Solution
A faulty PCM can cause a wide range of issues that can be difficult to diagnose. If you’re experiencing any of the following, this module is your likely solution:
- Check Engine Light (CEL): Often with communication error codes like P0601, P0606, or U-series codes.
- No-Start or Hard-Start: The engine cranks but refuses to start, or only starts after many attempts.
- Engine Stalling: The engine cuts out unexpectedly while driving or idling.
- Poor Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- Erratic Shifting: The transmission may shift harshly, incorrectly, or seem to hunt for gears.
Features & Benefits
- โ VIN-Programmed for Your Vehicle: We flash the module with your vehicle’s VIN and the newest GM software updates, ensuring it works correctly right out of the box.
- โ Plug-and-Play Design: No need for additional, costly programming at a dealership. In most cases, you can install it and go (some vehicles may require a security relearn procedure).
- โ Restores Original Performance: Corrects engine and transmission issues caused by a faulty computer, bringing back the smooth operation you expect.
- โ Broad Compatibility: A direct replacement for multiple service numbers including 12586242, 19299226, 89017738, and many more.
- โ This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
As a veteran technician, I can’t stress this enough: simply swapping a used computer from another vehicle is a recipe for disaster in modern trucks and SUVs. The PCM is the central command center that communicates with the transmission controller, body controller, anti-lock brake system, and even the instrument cluster. Our VIN programming service ensures these digital handshakes happen correctly. We’re not just loading generic software; we’re configuring the module to the exact specifications and options your vehicle left the factory with. This critical step prevents a cascade of new error codes and ensures every system functions as GM intended. This is the difference between a quick fix and the right fix.
Don’t let a bad computer keep your truck off the job site or your SUV parked in the driveway. This programmed 2004 Silverado 3500 PCM 12586242 is the most efficient and reliable way to solve your vehicle’s electronic woes and get back to driving with confidence. After purchasing, simply provide us with your VIN, and we’ll handle the rest.
Frequently Asked Questions
Do I need to do any extra programming after installation?
No. We program the PCM to your vehicle’s VIN before shipping. In some GM vehicles, a simple, key-on/key-off security relearn procedure may be necessary, which does not require any special tools and instructions can be easily found online.
Where is the PCM located on my 2004 Silverado or Sierra?
On most 2004 GM full-size trucks and SUVs like the Silverado, Sierra, and Tahoe, the PCM is located in the engine bay on the driver’s side, under the battery tray or near the fender well.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential.
Is this the correct part for my vehicle?
This unit replaces service number 12586242 and many others listed in the description. The best way to ensure compatibility is to match the service number on your current computer. If you’re unsure, please contact us with your VIN before ordering.
What is the difference between an ECM, PCM, and ECU?
The terms are often used interchangeably. ECM (Engine Control Module) typically controls only the engine. PCM (Powertrain Control Module) controls both the engine and transmission. ECU (Electronic Control Unit) is a more generic term. For this application, PCM is the most accurate term.