Error Code P0327: What It Means & What To Do?

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OBD-II Code P0327 is defined as a Knock Sensor #1 - Circuit Low Input (Single Sensor or Bank 1). Code P0327 indicates that the readings from the #1 Knock Sensor circuit are too low, is outside of its operational window and malfunctioning. Since the knock sensor is responsible for making the PCM aware of unexpected engine noises (primarily caused by an incorrect air/fuel mixture that leads to abnormal cylinder detonation), this code is often the reaction to another more serious problem.

Trouble Code P0327 stands for knock sensor low input. Code P0327 pertains to the sensor on bank 1. When an engine operates, the Powertrain Control System (PCM) learns the minimum and maximum frequency of the noise the engine produces. When the PCM determines that this frequency is less than or greater than the expected amount, a knock sensor code will set. 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.

What causes the problem of Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)?

• Defective Knock Sensor
• Defective Knock Sensor Circuit or connections
• Flawed EGR System
• Damaged Cooling System
• Incorrect air/fuel ratio

1. Knock Sensor - It is intended to record knocking noise in all engine operating states in order to prevent engine damage. So, it should work properly else can lead to the associated trouble codes. If you discover it faulty kindly replace it at earliest.
2. Engine Cooling System - A car engine produces a lot of heat when it is running, and must be cooled continuously to avoid engine damage. An engine cooling system not just keep the engine cool it also keep its temperature sufficiently warm to guarantee proficient, clean activity. Ensure its efficient functioning to avoid any trouble code.
3. Electronic Control Unit - Electronic Control Unit, ECU provides instructions for various electrical systems, instructing them on what to do and how to operate. Make sure it is not malfunctioned else can cause related problems.

Some common symptoms which help you identify the trouble code P0327 are listed below:

• Loss of power
• Hurdle while acceleration
• Spark knocking
• Illuminated check engine light

Keep the below mentioned points in mind while fixing this code but it’s always good to have a qualified technician to look after your vehicle when this error code arises.

• Begin with inspecting the resistance of the knock sensor (compare it to factory specs)
• Inspect for broken/frayed wires leading to the sensor
• Look at the wiring and connections leading to/from the knock sensor and PCM/ECM
• Check if 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

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This diagnostic trouble code (DTC) is a generic powertrain code. Although generic, the specific repair steps may vary depending on make/model.

• Begin with the visual inspection of the sensor and connection as many problems can easily be found in the harness and connectors.
• Perform a basic test of the knock sensor by connecting a timing light to the vehicle and start the engine.
• Locate the knock sensor and tap on an engine location near the sensor (do not directly strike the sensor). If the sensor is working correctly, you should see the timing begin to retard.
• Test the sensor output by if your vehicle fails the basic test listed above, it’s time to determine what part of the sensor circuit is to blame.
• Once again, tap on an engine location near the sensor. You should see an AC voltage reading on your digital multimeter. If not, the sensor is bad and should be replaced.
• If the knock sensor checks out OK, but you still have P0327 code illuminated, you’ll need to check the sensor circuit.
• Tests for continuity between the sensor and PCM. If your meter reads OL, there is an open somewhere in the circuit that must be repaired. If not, the PCM is likely the problem and should be replaced.

Common Mistakes When Diagnosing the P0327 Code

• Knock Sensor replaced where in actual reason was a cooling system problem
• Knock Sensor replaced where in actual reason was an EGR system malfunction