P0604 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0604 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0604 code.

What Does P0604 Code Mean?

OBD-II Code P0604 is defined as a Internal Control Module Random Access Memory (RAM) Error

The engine control module (PCM) performs many vital functions in a modern vehicle, including management of the Fuel and Ignition Systems. When the PCM loses communication with one or more control modules it will set code P0604.

P0604 Symptoms

• Decreased engine performance
• Engine may not start
• Engine may stall

Common Problems That Trigger the P0604 Code

• Powertrain Control Module (PCM) failure
• Wiring issue