P1617 – Immobilizer ID Box Error (Toyota)

Description

The ECM detected a malfunction in the immobilizer ID box, preventing proper key authentication.

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Symptoms

No start condition
Security light flashing
Key not accepted
Intermittent start issues
Immobilizer warning

Causes

Faulty ID box
Wiring issues
Connector corrosion
Weak battery
ECM communication error

Diagnosis

Inspect ID box
Check wiring
Test connectors
Measure battery voltage
Scan immobilizer system

Repair

Replace ID box
Repair wiring
Clean connectors
Replace ECM if needed