P0328 — Knock Sensor 1 Circuit High Input (Bank 1)
Moderate severityWhat it means
P0328 is stored when the engine control unit sees a fault involving the bank 1 knock sensor circuit. The knock sensor listens for detonation (pinging) so the control unit can retard ignition timing to protect the engine. A “high” reading means the signal is pinned near the top of its range — often an open circuit, a lost ground, or a short to voltage.
Common symptoms
- The live reading sits abnormally high or maxed out
- Reduced power or poor fuel economy
- Pinging under load in some cases
- Check engine light
Likely causes
- Open signal or ground wire
- Signal wire shorted to a voltage supply
- Faulty bank 1 knock sensor
- Wiring, connector or mounting-torque problem
What to check first
- Check for an open circuit or missing ground at the sensor connector
- Inspect the bank 1 sensor connector and wiring routing
- Verify the sensor is torqued correctly to the block
Can you keep driving?
Drivable, but the engine may pull timing and lose power; prolonged pinging can cause damage, so diagnose soon.
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