Programmed GM PCM 12589462 Powertrain Control Module for Silverado, Sierra, & More

Restore Peak Performance to Your GM Truck or Van

Is your GMC Safari, Chevy Silverado, or Express van running rough, stalling, or showing a persistent check engine light? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing your vehicle’s engine, transmission, and emissions systems. When it fails, it can cause a wide range of frustrating and performance-robbing issues. This replacement module, part number 12589462, is the definitive solution to get your vehicle back on the road and running like new.

Unlike a generic part from a local store, this PCM is delivered to you fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest, most stable software updates directly from GM. This VIN-specific programming is critical for ensuring that all systems—from fuel injection and ignition timing to transmission shift points and anti-theft systems—function exactly as the manufacturer intended. This eliminates the need for an expensive trip to the dealership for programming, making the installation process straightforward and saving you significant time and money.

Why Choose Our Programmed GM PCM 12589462?

When you’re dealing with a critical component like the PCM, you need a part you can trust. This module is meticulously inspected and prepared to meet or exceed original equipment specifications. The key is our professional programming service. By providing your VIN, you receive a module that is truly plug-and-play. It correctly communicates with your vehicle’s other modules, ensuring seamless operation of the instrument cluster, anti-lock brakes, and security system. This is the most reliable and efficient way to solve complex electronic issues and restore your vehicle’s original drivability and fuel efficiency.

Common Symptoms of a Failing Powertrain Control Module

• ✔ Check Engine Light: The most common indicator, often with codes related to sensors, emissions, or internal module failure.
• ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the PCM fails to correctly manage fuel and spark.
• ✔ Poor Fuel Economy: Incorrect air/fuel mixture calculations can lead to a sudden and significant drop in MPG.
• ✔ Transmission Shifting Problems: On automatic transmissions, you may experience harsh shifting, delayed engagement, or being stuck in one gear (limp mode).
• ✔ Vehicle Won’t Start: A completely failed PCM can prevent the fuel pump or ignition system from activating, resulting in a no-start condition.
• ✔ Failed Emissions Test: The PCM directly controls the emissions system, and a fault will almost certainly cause a test failure.

Installation and Setup

Replacing the PCM is a manageable task for a DIY mechanic. The module is typically located in the engine bay, either on the driver’s side near the battery or on the firewall. After disconnecting the battery, simply unplug the wiring harnesses, unbolt the old module, and install the new one. Once installed and the battery is reconnected, you will likely need to perform a simple security relearn procedure, also known as a Passlock or VATS relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and can usually be done without any special tools. A common method involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating the cycle two more times before starting the engine. Instructions for your specific vehicle are widely available online.