P0603 — Internal Control Module Keep Alive Memory (KAM) Error
| Meaning | The engine computer has detected a memory error in its permanent storage, which means it lost its long-term learned data when the key was turned off. This usually happens because of a sudden loss of power to the computer or an internal fault on the circuit board. |
| Family | Powertrain (P) |
Typical symptoms
The car might idle rough or feel different to drive after the battery was disconnected
Transmission shifting might feel unsettled as the system relearns driving habits
Common causes
A bad ground connection supplying the engine computer
An internal hardware failure inside the engine computer itself
What to do
Frequently asked questions
What does code P0603 mean?
Internal Control Module Keep Alive Memory (KAM) Error. The engine computer has detected a memory error in its permanent storage, which means it lost its long-term learned data when the key was turned off. This usually happens because of a sudden loss of power to the computer or an internal fault on the circuit board.
Can I keep driving with code P0603 active?
With caution: limp mode possible, have it checked soon
Common causes — P0603
A weak car battery or loose battery terminals causing a temporary voltage drop A bad ground connection supplying the engine computer An internal hardware failure inside the engine computer itself
How do you fix code P0603?
Check your battery health and make sure the battery cables are clean and tight first, as power drops often trigger this. If the battery and connections are solid, have a technician inspect the computer power supply circuits before considering a computer replacement.
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