2004 Sierra 1500 PCM Engine Computer 89017739 | Programmed to VIN

Restore Peak Performance to Your 2004 GM Truck or SUV

Is your 2004 GMC Sierra 1500, Silverado, or other GM vehicle suffering from frustrating and hard-to-diagnose issues? An erratic idle, stalling, poor fuel mileage, or a persistent Check Engine Light can often be traced back to a failing Powertrain Control Module (PCM), the central computer of your vehicle. This replacement PCM, part number 89017739, is the definitive solution to get your vehicle running reliably again. It arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring a seamless and correct installation process.

Common Symptoms of a Failing 2004 Sierra 1500 PCM

A faulty PCM can manifest in numerous ways, often intermittently, making diagnosis a challenge. If your truck is experiencing any of the following, a failing engine computer is a likely culprit:

• ✔ Check Engine Light: The most obvious sign, often accompanied by communication error codes (U-codes) or multiple, unrelated sensor codes.
• ✔ Engine Performance Problems: This includes random stalling, rough idling, hesitation during acceleration, engine misfires, and a noticeable loss of power.
• ✔ No-Start Condition: The engine may crank but will not start, or it may not crank at all if the PCM fails to energize the starter relay.
• ✔ Poor Fuel Economy: If the PCM cannot correctly manage the air-fuel mixture and ignition timing, your fuel consumption will increase significantly.
• ✔ Transmission Shifting Issues: The PCM works in tandem with the transmission controller. A failing module can cause harsh shifting, delayed engagement, or being stuck in one gear (limp mode).
• ✔ Intermittent Electrical Failures: Gauges on the instrument cluster may behave erratically or cooling fans may not turn on, leading to overheating.

The Plug-and-Play Solution You Need

Don’t waste time and money at a dealership on expensive diagnostics and programming fees. We take the guesswork out of the repair. When you order, you simply provide us with your vehicle’s VIN. Our technicians will then flash this module with the latest, most up-to-date GM factory software specific to your truck’s configuration. This process ensures all parameters for the engine, transmission, and emissions systems are set correctly from the moment you install it. This is not a generic, one-size-fits-all part; it is prepared specifically for your vehicle.

This module is a direct replacement for original part numbers 89017739 and 12586243 and fits a wide array of 2004 GM models, including the Chevrolet Silverado, Avalanche, Express Van, Trailblazer, GMC Savana, Envoy, and even performance vehicles like the Corvette and GTO. By replacing your old, failing computer, you are restoring the vehicle’s operational integrity and preventing potential damage to other components like the catalytic converter or transmission.

Installation and Post-Installation Requirements

Physically replacing the PCM is straightforward. On most trucks like the Sierra and Silverado, it’s located under the hood on the driver’s side, near the battery. After disconnecting the battery, you simply unbolt the old module, unplug the electrical connectors, and install the new one in its place. Because this unit comes pre-programmed to your VIN, the complex and expensive part of the job is already done. However, for many GM vehicles, you may need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure, often called a “Passlock Relearn,” typically takes about 30 minutes and can be done in your driveway with just the ignition key—no special tools required.