CAR OBD CODES

P0603 OBD Code Definition:
P0603 ECM Power Supply Circuit
P0603 OBD Code Description:

OBD2 Code P0603 Definition:
Battery voltage is supplied to the ECM/PCM even when the ignition switch is turned OFF for the ECM/PCM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. Symptoms

Possible sumptoms of P0603
– Engine Light ON (or Service Engine Soon Warning Light) – Engine may not start Possible Causes

Possible causes of P0603
– Loose or poor battery terminal connection – Low battery charge – ECM/PCM power supply circuit is open or shorted – ECM/PCM Programing – Faulty ECM/PCM The Error code is generally activated on detection of the following conditions: Indicates the ECM/PCM has experienced an internal memory fault. Possible Solutions

– Recharge battery – Resecure and clean battery terminal connection – Reprogram ECM/PCM – Replaced ECM/PCM
Note: The information on the P0603 error code is purely informative, if you need more useful information, please consult your technician.