Programmed 2004 Corvette PCM 12570557 | VIN Flashed Engine Computer

Is Your C5 Corvette Running Rough? The PCM is the Brain of Your Engine.

If you’re experiencing baffling issues with your 2004 Corvette—like a persistent check engine light, erratic shifting, poor fuel economy, or even a frustrating no-start condition—the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen countless hours and dollars wasted chasing phantom sensor codes when the vehicle’s central computer was the real culprit all along. The PCM is responsible for everything from ignition timing to fuel mixture, and when it starts to fail, the symptoms can be unpredictable and confusing.

Common Symptoms of a Failing 2004 Corvette PCM:

Don’t let a faulty module keep your Corvette parked. If you’re noticing any of the following, it’s time to consider a replacement:

• ✔ Persistent Check Engine Light (CEL) with various, often unrelated, trouble codes.
• ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
• ✔ Harsh or delayed shifting from the automatic transmission.
• ✔ Complete no-start or intermittent starting problems.
• ✔ Communication errors with diagnostic scan tools.
• ✔ Noticeable decrease in engine power and fuel efficiency.

Expert Pro Tip: Before installing your new PCM, take a moment to inspect the main harness connectors for any signs of corrosion or bent pins. On the C5 Corvette, these connectors are located in the passenger-side fender well area and can be susceptible to moisture intrusion. A quick spray with electronics cleaner and a gentle check of the pins can prevent communication errors that might otherwise be blamed on the new module.

The Easiest Solution: VIN-Programmed and Ready to Install

Forget about expensive dealership visits and the hassle of getting a module programmed. We handle the hard part for you. When you purchase this PCM, we use your vehicle’s unique Vehicle Identification Number (VIN) to flash it with the latest, most stable software updates directly from GM. This ensures that the module is a perfect match for your Corvette’s specific configuration, restoring its original performance and drivability right out of the box.

Plug-and-Play Installation: No Dealer Visit Required

Installing your new PCM is a straightforward process you can do in your own garage. For the 2004 Corvette, the module is conveniently located in the engine compartment on the right-hand (passenger) side.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery.
2. Locate the PCM: Find the module on the passenger side of the engine bay, near the firewall.
3. Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old module. Inspect them for any damage or corrosion.
4. Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install New Module: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the harness connectors.
6. Reconnect Battery: Reattach the negative battery terminal. Your Corvette is now ready to start.

Guaranteed Compatibility and Interchangeability

This module, part number 12570557, is a direct replacement for a wide range of GM vehicles. It is fully compatible with the following service and part numbers, ensuring a perfect fit and function:

Compatible Part Numbers: 12581565, IS 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 8125781270, 88864822, 89017733.

While this listing is focused on the 2004 Corvette PCM, this versatile P59 controller also fits many other 2003-2004 GM trucks, vans, and SUVs, including the Silverado, Sierra, Suburban, Express, Savana, and more. By providing your VIN, you guarantee we will supply the correct software for your exact vehicle.