P1603

Set by the manufacturer, so it means different things on different makes. 17 makes in the table below.

More codes than this one? Paste your whole scan

What P1603 means, by make 17 makes

Audi Internal Control Module, Failed Self-Test
BMW Control Module Self-Test, Torque Monitoring
Chevrolet Loss of SDM Serial Data
Chrysler PCM Internal Dual-Port RAM Communication Failure
Citroen EEPROM Malfunction
Dodge PCM Internal Dual-Port RAM Communication Failure
Fiat Control Unit Power Supply
Ford EEPROM Malfunction
Jaguar EEPROM Malfunction
Jeep PCM Internal Dual-Port RAM Communication Failure
Kia EEPROM Malfunction
Mazda Immobilizer System Fault
Mercedes-Benz No or incorrect CAN message from control unit EIS
Peugeot EEPROM Malfunction
Saab Internal Control Module Malfunction
Volkswagen Internal Control Module, Failed Self-Test
Volvo Internal Control Module Malfunction

Each line is that manufacturer's own meaning for P1603. They are genuinely different faults, not rewordings of one, so a meaning listed against one make says nothing about the others. If your make is not listed, we do not hold it - your manufacturer's service information is the authority.

Code structure P1603

Powertrain

engine, transmission and emissions

Manufacturer-specific

Defined by the vehicle manufacturer, so the meaning varies between makes.

Fault index

identifies the specific fault

Powertrain Manufacturer-specific

Nearby codes in the P1 range

Manufacturer code meanings from kierandrewett/obd (b56a07a), used under the MIT licence. Copyright (c) Kieran Drewett. SpareRadar is not affiliated with the dataset's authors.