What causes P1604 on a Toyota?

Engine that cranks long or fails to start Weak battery slowing crank speed Fuel delivery fault on startup Failing crank sensor during crank Immobilizer blocking the start

How do I fix P1604 on a Toyota?

Load-test the battery first Check fuel pressure during crank Watch crank sensor signal while cranking Verify the immobilizer light goes out with a known key Diagnose the no-start cause — P1604 only records the event

P1604 Startability Malfunction

Q: What does P1604 mean on a Toyota?

P1604 — Startability Malfunction. Applies to Camry, Corolla, RAV4, Prius with extended crank or no-start.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Camry, Corolla, RAV4, Prius with extended crank or no-start

What does P1604 mean on a Toyota?

P1604 — Startability Malfunction. This Toyota-enhanced code applies to Camry, Corolla, RAV4, Prius with extended crank or no-start.

Common causes of P1604

Engine that cranks long or fails to start
Weak battery slowing crank speed
Fuel delivery fault on startup
Failing crank sensor during crank
Immobilizer blocking the start

How to fix P1604

Load-test the battery first
Check fuel pressure during crank
Watch crank sensor signal while cranking
Verify the immobilizer light goes out with a known key
Diagnose the no-start cause — P1604 only records the event