What does code P0603 mean?

Internal Control Module Keep Alive Memory (KAM) Error: The ECM keep-alive memory has lost its data, possibly due to a battery disconnect or internal fault.

P0603 is rated as medium severity. Schedule service — affects performance or emissions.

P0603

Internal Control Module Keep Alive Memory (KAM) Error

Powertrain Code · Medium

What does P0603 mean?

The ECM keep-alive memory has lost its data, possibly due to a battery disconnect or internal fault.

System: ECU

P0603 is a powertrain diagnostic trouble code indicating internal control module keep alive memory (kam) error. This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.