How is fault code P0327 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. Scan it and read the freeze-frame data, then check for any other codes sitting alongside it. A misfire or fuel trim code stored at the same time changes the picture. 2. Get eyes on the sensor and its wiring. Knock sensors live in a filthy part of the engine, so look for green corrosion in the connector, chafed insulation, and a connector that isn't fully seated. 3. Check the sensor is torqued down properly to the block. These are fussy about clamp load, and a sensor that's been disturbed or wasn't done up right will read low even if it's a good unit. 4. Backprobe the connector and measure the sensor's AC output, you should see roughly 0.5 to 2.0 volts as the engine runs. Sitting under 0.2 volts points at a dead sensor. 5. Test continuity and resistance back to the ECM and confirm the earth is solid, you want well under 0.5 ohms on the ground side. A poor earth is a classic cause of a low-input code with a perfectly good sensor. 6. Check battery and alternator voltage at idle, 13.5 to 14

Knock Sensor 1 Circuit Range/Performance (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. Scan it and read the freeze-frame data, then check for any other codes sitting alongside it. A misfire or fuel trim code stored at the same time changes the picture. 2. Get eyes on the sensor and its wiring.

PPowertrain
0Generic code
3Ignition / Misfire
27Sequence 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 P0327 stands for knock sensor low 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 P0327 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.