What does it mean?
This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by make/model.
A knock sensor informs the engine computer when one or more of your engine’s cylinders are “knocking,” meaning they ignite the air/fuel mixture in a way that delivers less power and can damage the engine if prolonged.
The computer uses this information to adjust the engine to prevent knocking. If your knock sensor on bank #1 produces a low output voltage (possibly below 0.5V), it will trigger DTC P0327. This P0327 code may appear intermittently, or the Service Engine light may stay on continuously. Other DTCs related to knock sensors include P0325, P0326, P0328, P0329, P0330, P0331, P0332, P0333, and P0334.
Symptoms
You may notice driving issues including engine RPM fluctuations, power loss, and possibly some hesitation. There may also be other symptoms.
Causes
Potential causes of DTC P0327 include (but are not limited to):
The knock sensor is faulty and needs replacement
There is an open/short circuit or fault in the knock sensor circuit
The PCM/ECM has failed
Possible solutions
Check the knock sensor resistance (compare to factory specifications)
Inspect for broken/frayed wires leading to the sensor
Check wiring and connections to/from the knock sensor and PCM/ECM
Verify proper voltage reaches the knock sensor (e.g., 5 volts)
Check proper grounding of the sensor and circuit
Replace the knock sensor
Replace the PCM/ECM