What causes P1605 on a Toyota?

Internal ECM knock processing fault Failing knock sensor feeding garbage Engine mechanical noise overwhelming the sensor Corroded knock sensor connector Low system voltage during processing

How do I fix P1605 on a Toyota?

Rule out real engine knock and mechanical noise first Test the knock sensor and its wiring Verify system voltage stability Check for Technical Service Bulletins on knock logic Replace the ECM only after sensor exclusion

P1605 Knock Control CPU Malfunction

Q: What does P1605 mean on a Toyota?

P1605 — Knock Control CPU Malfunction. Applies to Camry, Corolla, RAV4 with knock control.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Camry, Corolla, RAV4 with knock control

What does P1605 mean on a Toyota?

P1605 — Knock Control CPU Malfunction. This Toyota-enhanced code applies to Camry, Corolla, RAV4 with knock control.

Common causes of P1605

Internal ECM knock processing fault
Failing knock sensor feeding garbage
Engine mechanical noise overwhelming the sensor
Corroded knock sensor connector
Low system voltage during processing

How to fix P1605

Rule out real engine knock and mechanical noise first
Test the knock sensor and its wiring
Verify system voltage stability
Check for Technical Service Bulletins on knock logic
Replace the ECM only after sensor exclusion