OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0328?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- PossibleMechanical noise picked up by sensor (loose accessory)
- PossibleSignal wire shorted to supply voltage
- Less likelySensor failed
Symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Knock Sensor, Knock Sensor Wiring
Related codes
- P0333Knock Sensor 2 Circuit High Input (Bank 2)
- P0325Knock Sensor 1 Circuit Malfunction (Bank 1)
- P0326Knock/Combustion Vibration Sensor A Circuit Range/Performance
- P0327Knock Sensor 1 Circuit Low Input (Bank 1)
- P0329Knock/Combustion Vibration Sensor A Circuit Intermittent
- P032AKnock/Combustion Vibration Sensor C Circuit
- P032BKnock/Combustion Vibration Sensor C Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.