LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Infiniti
>>
2012
>>
G25 x
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Control System - DTCS P0443 To P1084
>>
DTC P0603: ECM Power Supply
>>
DTC Logic
>>
DTC Detection Logic
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
DTC Detection Logic
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
ECM power supply circuit
ECM back-up RAM system does not function properly.
Harness or connectors [ECM power supply (back-up) circuit is open or shorted.]
ECM