What does code P1605 mean on Lexus vehicles?
The ECM reports an internal malfunction of the knock control processing unit, affecting ignition timing control.
OBD-II Code Lexus
P1605 — Lexus — Knock Control CPU Malfunction
The ECM reports an internal malfunction of the knock control processing unit, affecting ignition timing control.
Common symptoms
- Loss of power
- reduced engine performance
Possible causes
- Defective ECM internal circuitry
Initial recommendation
Perform ECM diagnostics and replace or reprogram ECM if confirmed faulty.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Lexus code P1605 with your vehicle's actual symptoms for more complete diagnostic guidance.
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