P0604 - PCM Random Access Memory (RAM) Error

What does P0604 mean?

This code indicates a fault within the Random Access Memory (RAM) of the Powertrain Control Module (PCM). This memory is used for active data processing.

• Internal PCM hardware failure
• Electrical interference affecting RAM
• Overheating of the PCM

Click steps to track your progress.

1. 1

   Ensure the PCM is not overheating.

2. 2

   Check for any aftermarket accessories that might cause electrical interference.

3. 3

   Inspect the PCM connections for damage or corrosion.

4. 4

   PCM replacement is often necessary for RAM errors.