P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

What Does The P0327 Code Mean?

A knock sensor tells the engine computer when one or more of your engine’s cylinders are “knocking”, that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged.

The computer uses this information to tune the engine so that it doesn’t knock. If your knock sensor on Bank #1 is generating a low output voltage (perhaps under 0.5V), then it will trigger a P0327 DTC. This P0327 code may show up intermittently or the Service Engine light may be lit constantly.

Other knock sensor related DTC codes include P0325, P0326, P0328, P0329, P0330, P0331, P0332, P0333, and P0334.

What Are The Symptoms Of The P0327 Code?

You may notice drivability problems including fluctation engine RPM, a loss of power, and perhaps some hesitation. There may also be other symptoms.

What Are The Potential Causes Of The P0327 Code?

Potential causes for a P0327 DTC include (but are not limited to):

• The knock sensor is faulty and needs to be replaced
• There is a wiring open/short/fault in the knock sensor circuit
• The PCM/ECM has failed

How Can You Fix The P0327 Code?

• Verify the resistance of the knock sensor (compare it to factory specs)
• Inspect for broken/frayed wires leading to the sensor
• Check the wiring and connections leading to/from the knock sensor and PCM/ECM
• Verify proper voltage is reaching the knock sensor (e.g. 5 volts)
• Verify proper grounding of sensor and circuit
• Replace the knock sensor
• Replace the PCM/ECM

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Knock Sensor Parts
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> ECU

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

Reference Sources

Engine Control Service Manual for P0327 – Pages 92-94.