How is fault code P0328 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull the freeze frame data with the code and note the engine speed, load, temperature and voltage at the moment it logged. That tells you whether the fault is constant or only shows up under certain conditions 2. Get eyes on the sensor, the harness and the connector. Look for chafed wires, green corrosion in the plug, or a connector that isn't seated. This is where the cheap fixes live 3. Measure resistance and voltage at the sensor terminals with a multimeter and compare against the manual values for that engine 4. Check continuity in the wiring between the sensor connector and the ECU, hunting for an open circuit or a short to voltage 5. Confirm the sensor is mounted to the block at the correct torque and sitting flush, because a loose sensor reads erratically 6. If the circuit and sensor all check out clean, then look at the ECU input side or a calibration update before condemning the module

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Jump to the fix

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull the freeze frame data with the code and note the engine speed, load, temperature and voltage at the moment it logged. That tells you whether the fault is constant or only shows up under certain conditions 2. Get eyes on the sensor, the harness and the connector.

PPowertrain
0Generic code
3Ignition / Misfire
28Sequence number

What does it mean?

The knock sensor (KS) is mounted in the engine and is used to detect spark knock. When there is spark knock or pinging, the sensor produces a voltage signal that is sent to PCM. The PCM will then retard ignition timing to protect the engine. Inside, the knock sensor is a piezoelectric crystal. This crystal is used to produce AC voltage under vibration. The knock sensor is a form of transducer, which is a device that converts changes in physical quantity into an electrical signal.

In other words, a knock sensor does not receive a reference voltage from the PCM – it creates its own. There are two basic types of knock sensors: the style used in older vehicles and the resonant design used in modern vehicles. Cross section of a typical knock sensor P0328 stands for knock sensor high input. This means the PCM has detected a problem with the knock sensor or its circuit. Some vehicles may be equipped with two knock sensors.

Code P0328 pertains to the sensor on bank 1 (the side of the engine where the #1 cylinder is located).

Symptoms

Likely causes

How to fix it

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.