- Loose or poor battery terminal connection
- Low battery charge
- ECM power supply circuit is open or shorted
- ECM Programing
- Faulty ECM
Tech notesStart by charging the vehicles battery and clean terminal, once the battery is charged and the terminals are clean and secure, erase code. If the code comes back ON you may have to reprogram or replaced ECM
When is the code detected?Indicates the ECM has experienced an internal memory fault.
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine may not start
P0603 Bmw DescriptionBattery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.
Need more help?Get the P0603 Bmw code diagnosed by a professional: Find a repair shop in your area
P0603 BMW CommentsHelp us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0603 Bmw code? Have you replaced any parts?
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