Sensors are installed in your vehicle to collect and monitor various types of data. The ‘Knock Sensor,’ is one of these sensors. It is used to detect vibrations and knocking that can damage an engine. The knock sensor can cause a number of fault codes, including P0327. This fault code can be a sign of more serious problems, since the knock sensor is designed to alert the PCM when there are unexpected engine noises. The Powertrain Control Module, or ECM, or ECU, is programmed with the minimum and maximum frequencies of noise that the engine is likely to produce. The PCM will set a fault code if the frequency of the engine noise is greater or less than expected. When the knock sensor on Bank #1 generates a low voltage signal, (probably less than 0.5V), P0327 fault code is set. This code can appear intermittently, and then disappear.
Other fault codes related the the knock sensor are P0325,P0326,P0328,P0329,P0330,P0331,P0332,P0333,and P0334.
Table of Contents
What are the possible causes of fault code P0327?
- Faulty Knock Sensor
- Faulty Knock Sensor Circuit or Connections
- EGR system faulty
- Damaged cooling systems
- Incorrect air-fuel mixture
- ECU/ECM/PCM faults are rare
What are the symptoms of fault code P0327?
- Engine fault light illuminated
- Roaring and rattle noises coming from the engine when you accelerate
- Fluctuations of engine speed
- There may not be any symptoms in some cases
How to Fix Fault Code P0327?
- Test the knock sensor resistance (compare to factory specifications)
- Check for damaged/worn cables leading up to the sensor
- Check the cables and connections leading to/from PCM/ECM and the knock sensor
- Check that the knock sensor is receiving the correct voltage (e.g. 5 volts)
- Verify the sensor and circuit is properly grounded
- Replace the knock sensor
- Replace the ECU/PCM/ECM
