sevice engine light comes on for code p0603.

Question

I have an audio system w/multiple amplifiers. I have a secondary battery and a battery isolator. The sevice engine light comes on only after the system is played at maximum levels. Light comes on after the car is turned off then restarted. Not while driving.

Answer 1

Hi there,

This code indicates an issue with the ECM. Here is a list of possible causes. 

P0603 NISSAN - Engine Control Module Power Supply Circuit

Read more: https://www.autocodes.com/p0603_nissan.html