Restore Peak Performance to Your GM Truck or Van
Is your 2003 GMC Sierra 3500, or another compatible GM vehicle, suffering from erratic engine behavior, poor fuel economy, or transmission shifting problems? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can lead to a frustrating driving experience, failed emissions tests, and even a no-start condition, leaving you stranded. This direct-fit replacement PCM, part number 12570558, is the definitive solution to get your vehicle running reliably again.
The Brains of the Operation: Understanding Your 2003 Sierra 3500 PCM
The PCM is one of the most critical components in your truck. It constantly analyzes data from dozens of sensors throughout the engine and transmission to manage vital systems like fuel injection, ignition timing, emissions controls, and automatic transmission shift points. When it begins to fail, the symptoms can be widespread and confusing. You might notice a sudden drop in power, inexplicable check engine lights, or a transmission that seems to have a mind of its own. Replacing the module is often the only way to restore the precise control needed for optimal performance and efficiency.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Engine stalling, misfiring, or running rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions inspections.
Plug-and-Play Solution, Programmed to Your VIN
The biggest hurdle in replacing a modern vehicle computer is the complex programming required. This module eliminates that problem entirely. We professionally program this PCM to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This process ensures that all factory settings, engine parameters, and anti-theft information are correct for your exact build. This means no expensive trips to the dealership for programming. Once you receive the module, installation is straightforward. In most cases, after installation, you will only need to perform a simple security relearn procedure (often called a CASE relearn), which can be done without special tools. This restores communication between the new PCM and your vehicle’s security system.
This unit is a direct replacement for a wide range of GM vehicles from the 2003-2004 era, including the Chevrolet Silverado, GMC Sierra, Suburban, Yukon, Express, and Savana vans, among others. It is compatible with multiple service numbers, including 12581565, 12570557, 12576106, and 89017733, making it a versatile and reliable choice for your repair.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during or after checkout, and we will load the latest GM software specific to your truck.
Where is the PCM located on my 2003 Sierra 3500?
On most 2003 GM trucks like the Sierra and Silverado, the PCM is located in the engine bay on the driver’s side, underneath the battery tray.
What is a CASE relearn and is it difficult?
A CASE (Crankshaft Angle Sensor Error) relearn, also known as a security relearn, synchronizes the new PCM with your engine’s sensors. While some advanced scan tools can do it instantly, a manual procedure often involves a series of key cycles. Instructions are widely available online for your specific model and it does not typically require a mechanic.
Is this a new or used part?
This is a high-quality, inspected, and tested used OEM part. Each unit is verified for full functionality before being programmed and shipped, ensuring reliable performance.
How do I provide my VIN?
You can add your VIN to the notes section during checkout or send it to us in a message after you complete your purchase. We cannot ship your order until we have your VIN to program the module.