P0328 — Knock Sensor 1 Circuit High Input (Bank 1)
The knock sensor signal voltage is above the expected range. Often caused by a sensor producing excess output due to mechanical noise (loose mounting, accessory drive vibration) rather than a sensor fault.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Knock sensor
- Knock sensor wiring
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Mechanical noise picked up by sensor (loose accessory)
- Signal wire shorted to supply voltage
- Sensor failed
Possible symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.