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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Common causes
Ordered by how often each turns out to be the cause.
- Mechanical noise picked up by sensor (loose accessory)Possible
- Signal wire shorted to supply voltagePossible
- Sensor failedLess likely
Parts involved
- Knock Sensor
- Knock Sensor Wiring
P0328 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.