P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0328 means the ECU is detecting a voltage on the knock sensor 1 signal that is higher than the expected range. This typically happens when the signal wire is shorted to a 12 V source, the sensor has failed internally, or the wiring is open in a way that leaves the input floating. Without a trusted knock signal the ECU adopts conservative timing, reducing performance and fuel economy.

P0328 è un codice diagnostico di guasto relativo a accensione, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0328 e accende la spia motore.

Se il tuo veicolo ha attivato P0328, potresti notare uno o più di questi sintomi:

• Check engine light on
• Noticeable loss of power, especially under load
• Reduced fuel economy
• Audible pinging or knocking under acceleration in some cases
• Possible hesitation at higher RPM

Ecco le cause più comuni di P0328, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. With the knock sensor signal stuck high, the ECU pulls ignition timing as a safety measure. The engine still runs but loses power and fuel economy, and persistent knock can damage pistons over time. Fix within a couple of weeks.

Segui questi passaggi per individuare la causa principale di P0328:

1. Read freeze-frame data and note RPM and load when the code was set. A code set only at high load can point to a wiring fault that opens under engine flex
2. Locate the knock sensor (often under the intake manifold on V6/V8, or on the side of the block on inline engines). Inspect the connector for water, oil, and bent pins
3. Measure resistance across the sensor terminals with the connector unplugged. A typical reading is in the high-kilo-ohm to low-mega-ohm range; an open circuit or near-zero reading both indicate a failed sensor
4. Verify continuity of the signal wire from the sensor connector to the ECU pin. An open in the wire can present as a high-input fault on some ECUs
5. If wiring and sensor are good, scope the signal during a controlled rev to confirm the sensor is producing a clean piezo voltage as the engine vibrates

I costi di riparazione di P0328 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0328 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Questi codici compaiono spesso insieme a P0328 o indicano problemi correlati: