Immobilizer Communication Fault
2024-2024 Volvo EX30 Single Motor RWD
Description
The ECM detected a communication failure with the immobilizer system. The anti-theft system cannot verify the key, preventing engine start authorization. Volvo uses a transponder-based immobilizer integrated with the CEM (Central Electronic Module).
Symptoms
- Engine cranks but will not start
- Immobilizer warning light on
- Key symbol on dashboard
- No fuel injection pulse
- No ignition spark
Common Causes
- Faulty key transponder
- CEM (Central Electronic Module) fault
- Antenna coil around ignition lock failure
- ECM immobilizer data corrupted
- Wiring fault between CEM and ECM
Diagnostic Steps
- Test key transponder recognition with VIDA/DiCE
- Check CEM communication
- Test antenna coil resistance
- Verify immobilizer authorization status in ECM
- Check wiring between CEM and ECM
Repair Notes
Reprogram the immobilizer system using Volvo VIDA/DiCE; replace CEM or key if defective.
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
P1081 on Other Vehicles
Common Questions
What does code P1081 mean on a 2024-2024 Volvo EX30?
P1081 stands for "Immobilizer Communication Fault". The ECM detected a communication failure with the immobilizer system. The anti-theft system cannot verify the key, preventing engine start authorization. Volvo uses a transponder-based immobilizer integrated with the CEM (Central Electronic Module).
What are the symptoms of P1081 on a Volvo EX30?
Common symptoms of P1081 include: Engine cranks but will not start, Immobilizer warning light on, Key symbol on dashboard, No fuel injection pulse, No ignition spark.
What causes P1081 on a 2024-2024 Volvo EX30?
Common causes of P1081 include: Faulty key transponder, CEM (Central Electronic Module) fault, Antenna coil around ignition lock failure, ECM immobilizer data corrupted, Wiring fault between CEM and ECM.