What does code P1605 mean on Toyota vehicles?
The ECU detects an internal malfunction in the knock control processor, affecting ignition timing control.
OBD-II Code Toyota
P1605 — Toyota — Knock Control CPU Malfunction
The ECU detects an internal malfunction in the knock control processor, affecting ignition timing control.
Common symptoms
- Poor engine performance
- reduced power
- possible knocking under load
Possible causes
- Internal ECM fault
- knock control processor failure
Initial recommendation
Scan ECM for internal faults and consider ECM testing or replacement.
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 Toyota code P1605 with your vehicle's actual symptoms for more complete diagnostic guidance.
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