P1605
Knock Control CPU Malfunction
2001-2006 Lexus LS 430 4.3L V8 🇩🇪
High SeverityPowertrain
Description
The ECM detected a communication failure with the knock control CPU.
Symptoms
- CEL
- Engine knock under load
- Reduced performance
- Timing retarded to safe value
Common Causes
- Faulty knock CPU in ECM
- Damaged knock sensor wiring
- Faulty knock sensor
- Poor connections
Diagnostic Steps
- Test knock sensor
- Inspect wiring harness
- Check ECM operation
- Monitor knock retard
Repair Notes
Replace knock sensor or ECM.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1605 on Other Vehicles
Common Questions
What does code P1605 mean on a 2001-2006 Lexus LS 430?
P1605 stands for "Knock Control CPU Malfunction". The ECM detected a communication failure with the knock control CPU.
What are the symptoms of P1605 on a Lexus LS 430?
Common symptoms of P1605 include: CEL, Engine knock under load, Reduced performance, Timing retarded to safe value.
What causes P1605 on a 2001-2006 Lexus LS 430?
Common causes of P1605 include: Faulty knock CPU in ECM, Damaged knock sensor wiring, Faulty knock sensor, Poor connections.