P0329 — Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
Drive with caution — fix soon.
What P0329 means
This code means the voltage from the knock sensor is reading higher than expected. It usually points to a short to power in the wiring, a failed knock sensor, or a connector issue. The fix typically involves inspecting the wiring for shorts to voltage and replacing the knock sensor if needed.
Common symptoms
- Check engine light is on
- Minor loss of power
- Reduced fuel economy
- Possible engine pinging under load
- Driving otherwise feels mostly normal
Common causes
- Failed knock sensor
- Short to voltage in the sensor wiring
- Corroded or loose connector
- Wiring chafe or insulation damage
- Engine control module fault
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0329 code?
Usually yes, for short distances. The engine runs, but its detonation protection may be compromised. Drive gently and have it checked within a week.
How much does it cost to fix a P0329 code?
Most repairs are $150 to $500. The sensor is typically inexpensive, but labor rises when it's mounted under the intake manifold.
Is a P0329 code serious?
It's moderate. There's no immediate breakdown, but a malfunctioning knock sensor reduces the engine's protection from damaging detonation.
What does high input mean for a P0329 code?
It means the sensor's voltage signal is reading higher than normal. This often points to a short to power in the wiring or a failing sensor.