Knock Sensor 1 Circuit Low, Bank 1 or Single Sensor
The controller detected a low signal in knock sensor 1 circuitry during its electrical check. Low input does not establish that combustion knock is absent and is not an engine-temperature reading. Bank 1 is the cylinder 1 side, or the single-sensor application as specified. Sensor wiring and connections must be tested before assuming the sensor needs replacement.
Can I keep driving?
Loud metallic knocking, an oil-pressure warning, overheating or unsafe power loss calls for a safe stop and towing. With a steady light and no symptoms, get shop guidance before further driving and avoid heavy load or hard acceleration.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- Steady check engine light
- Reduced response when ignition control is limited
- There may be no other symptoms
Possible causes
- 1Short to ground in the sensor circuit
- 2Damaged connector or moisture intrusion
- 3Internal knock sensor 1 fault
- 4Signal, ground or controller fault depending on circuit design
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Save the code and freeze-frame data if your scanner offers them, without clearing anything.
- With the engine off and cool, look only at accessible wiring for obvious damage; do not reach under the intake or disconnect connectors.
When you need a shop
Have the low-signal circuit tested using the vehicle wiring diagram, together with sensor 1 and its mounting. If loud knocking occurs, stop safely and arrange towing rather than testing under load.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P0327?
Loud metallic knocking, an oil-pressure warning, overheating or unsafe power loss calls for a safe stop and towing. With a steady light and no symptoms, get shop guidance before further driving and avoid heavy load or hard acceleration.
What can cause P0327?
Possible causes include short to ground in the sensor circuit; damaged connector or moisture intrusion; internal knock sensor 1 fault; signal, ground or controller fault depending on circuit design. These are diagnostic possibilities, not a confirmed diagnosis or a parts shopping list.
Does clearing the code fix the problem?
No. Clearing a code does not repair the problem or prove that no fault exists. It may erase useful evidence and reset readiness monitors. Save codes and freeze-frame data first; confirming a repair requires the vehicle-specific checks.
What if this code appears during a used-car inspection?
Arrange an independent professional pre-purchase inspection before committing. Request a complete scan, readiness status and diagnosis of the relevant system. Get written findings and a repair estimate; an unlit warning lamp does not replace inspection.
How much does a P0327 repair cost?
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.