Programmed 2003-2006 Suburban 2500 PCM 12589463 | Engine Computer

Is Your GM Truck or SUV Experiencing Frustrating Engine Problems?

If your 2003-2006 Suburban 2500, or another compatible GM vehicle, is suddenly stalling, shifting erratically, or refusing to start, a failing Powertrain Control Module (PCM) is a very likely culprit. As the brain of your vehicle’s engine and transmission, when the PCM starts to fail, it can cause a cascade of confusing and intermittent issues that can be a nightmare to diagnose. You might be dealing with a persistent Check Engine Light, poor fuel economy, or communication error codes that leave you stranded.

Don’t let a faulty computer keep your reliable truck off the road. This is a direct-fit replacement PCM, programmed specifically for your vehicle, designed to restore performance and get you back to work and life without a costly trip to the dealership.

The Simple, Reliable Solution: VIN-Programmed and Ready to Install

We take the guesswork and complexity out of the repair. Here’s how our service works:

• ✔ VIN-Specific Programming: After your purchase, simply provide us with your vehicle’s VIN. We then flash this PCM with the latest official GM software calibration that matches your truck’s exact specifications.
• ✔ Resolves Common Failures: This module is the definitive fix for many common GM truck issues, including no-start conditions, harsh shifting, false sensor codes, and engine stumbling.
• ✔ Plug-and-Play: Because we program it beforehand, you won’t need to have it programmed at a dealer. In most cases, you can install it yourself in under an hour. A security relearn procedure may be required, which is a simple process you can do at home.
• ✔ Wide Compatibility: This PCM, service number 12589463, is a workhorse for GM and is also a direct replacement for service numbers 89017750, 12582605, 12602802, 89017734, and 28042802.

Expert Pro Tip: Before installing your new PCM, take a moment to inspect the battery and battery tray directly above it. A leaking battery is the #1 killer of these modules, as the acid drips down and corrodes the casing and connectors. Clean any corrosion from the tray and wiring harness connectors with a terminal cleaner to ensure a perfect connection and prevent future damage to your new part.

Easy Installation Guide for Your 2003-2006 Suburban 2500 PCM

Replacing the PCM on these trucks is straightforward. It’s typically located in the engine bay on the driver’s side, under the battery tray. While exact steps may vary slightly by model, here is a general guide:

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. Access the Module: You will likely need to remove the battery to gain access to the PCM mounted below it.
3. Disconnect the Harnesses: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them. Note their color and position (they are often color-coded).
4. Remove the Old PCM: Unbolt the old module from its mounting bracket.
5. Install the New PCM: Mount the new, programmed PCM in place and securely fasten it.
6. Reconnect Everything: Plug the wiring harnesses back into the correct ports on the new module. Reinstall the battery and connect the negative terminal.
7. Perform Security Relearn (If Needed): In some cases, you may need to perform a simple security relearn. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start, and the security light will be off.

By ordering this pre-programmed PCM, you are choosing a reliable, cost-effective repair that restores your vehicle’s factory performance and drivability. Get your truck running right again and order with confidence.