Internal Control Module Malfunction
2024-2024 Volvo EX30 Single Motor RWD
Description
The ECM detected an internal hardware or software malfunction. The ECM self-diagnostic routines have identified a failure in one of its internal circuits or memory areas.
Symptoms
- Check Engine Light
- Various driveability issues
- Other fault codes may appear
- Intermittent problems
Common Causes
- ECM internal circuit failure
- ECM memory corruption
- Voltage spike or brown-out damage
- ECM software error
- Poor ECM ground connection
Diagnostic Steps
- Check all ECM power and ground connections
- Clear codes and verify if fault returns
- Update ECM software to latest version
- Test ECM supply voltage stability
- Replace ECM if internal fault confirmed
Repair Notes
Update ECM software; replace ECM if internal malfunction persists after reprogramming.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P1603 on Other Vehicles
Common Questions
What does code P1603 mean on a 2024-2024 Volvo EX30?
P1603 stands for "Internal Control Module Malfunction". The ECM detected an internal hardware or software malfunction. The ECM self-diagnostic routines have identified a failure in one of its internal circuits or memory areas.
What are the symptoms of P1603 on a Volvo EX30?
Common symptoms of P1603 include: Check Engine Light, Various driveability issues, Other fault codes may appear, Intermittent problems.
What causes P1603 on a 2024-2024 Volvo EX30?
Common causes of P1603 include: ECM internal circuit failure, ECM memory corruption, Voltage spike or brown-out damage, ECM software error, Poor ECM ground connection.