P0327 Code: Knock Sensor 1 Circuit Low Input (Bank 1)
🟠 Moderate severity · drivable
Drivable, but the computer can't detect knock and may reduce performance, so fix it soon.
What P0327 means
The bank 1 knock sensor is reporting voltage that's too low. Without a proper knock signal, the computer can't protect the engine from detonation (pinging).
Symptoms
- Check engine light is on
- Reduced power
- Possible engine pinging
- Poor fuel economy
Common causes
- most common: Faulty knock sensor
- common: Shorted or damaged sensor wiring
- less common: Corroded sensor connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the knock sensor | Yes | $50–200 |
| Repair shorted sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0327 code?
Yes, but you may notice reduced power. Fix it soon so the engine can protect itself from knock.
What is the most common cause of P0327?
A faulty knock sensor reading low voltage.
How much does it cost to fix a P0327?
Typically $50–$200 for a new knock sensor.
Related codes
P0325
P0325 Code: Knock Sensor 1 Circuit Malfunction (Bank 1)
P0328P0328 Code: Knock Sensor 1 Circuit High Input (Bank 1)
P0330P0330 Code: Knock Sensor 2 Circuit Malfunction (Bank 2)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.