OBD-II code · Powertrain (generic)
P0327 Knock Sensor 1 Circuit Low Input (Bank 1)
The knock sensor signal voltage is below the expected range. Usually points to a piezoelectric sensor that has lost its output, or a short to ground in the signal line.
Is it safe to drive with P0327?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyKnock sensor failed
- PossibleSignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
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
- P0332Knock Sensor 2 Circuit Low Input (Bank 2)
- P0324Knock/Combustion Vibration Control System Error
- P0325Knock Sensor 1 Circuit Malfunction (Bank 1)
- P0326Knock/Combustion Vibration Sensor A Circuit Range/Performance
- P0328Knock Sensor 1 Circuit High Input (Bank 1)
- P0329Knock/Combustion Vibration Sensor A Circuit Intermittent
- P032AKnock/Combustion Vibration Sensor C Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.