P1613 – Immobilizer System Error (Toyota)
Description
The ECM detected an internal immobilizer system error affecting key authentication and engine start.
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Compare Diagnostic ScannersSymptoms
- No start condition
- Security light flashing
- Key not accepted
- Intermittent start issues
- Check engine light
Causes
- Internal immobilizer fault
- ECU memory corruption
- Weak transponder signal
- Connector corrosion
- Wiring issues
Diagnosis
- Scan immobilizer system
- Inspect connectors
- Test key transponder
- Check wiring
- Verify ECM communication
Repair
- Replace key
- Repair wiring
- Clean connectors
- Replace immobilizer ECU
- Reprogram system
