P1615 – Immobilizer Wrong Signal (Toyota)

Description

The ECM detected an incorrect immobilizer signal during key authentication, preventing engine start.

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Symptoms

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

Causes

Weak key transponder
Signal interference
Faulty antenna coil
Wiring issues
Immobilizer ECU error

Diagnosis

Test key transponder
Inspect antenna coil
Check wiring
Scan immobilizer system
Verify ECM communication

Repair

Reprogram key
Replace antenna coil
Repair wiring
Replace immobilizer ECU