P0327 Code - Knock Sensor Circuit Low Voltage Bank 1
Quick Answer
The Knock Sensor system enables the Engine Control Module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation, also known as spark knock. Common causes include Faulty Knock Sensor Bank 1, Knock Sensor Bank 1 circuit poor electrical connection, Knock Sensor Bank 1 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0327 indicates Knock Sensor Circuit Low Voltage Bank 1.
- Common causes
- Common causes include Faulty Knock Sensor Bank 1, Knock Sensor Bank 1 circuit poor electrical connection, Knock Sensor Bank 1 harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0327 Description
The control module learns a minimum noise level, or background noise, at idle from the knock sensor and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal knock sensor signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal knock sensor signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses knock sensor signal information when each cylinder is near the Top Dead Center (TDC) of the firing stroke. If a knock is present, the signal will range outside of the noise channel.
If the control module has determined that a knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero-compensation level, or no spark retard. An abnormal knock sensor signal will stay outside of the noise channel or will not be present. knock sensor diagnostics are calibrated to detect faults with the knock sensor circuitry inside the control module, the knock sensor wiring, or the knock sensor voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.
The Diagnostic Trouble Code (DTC) will be set when the signal from the Knock Sensor Bank 1 is short to ground for greater than 5s.
What are the Possible Causes of the DTC P0327?
- Faulty Knock Sensor Bank 1
- Knock Sensor Bank 1 circuit poor electrical connection
- Knock Sensor Bank 1 harness is open or shorted
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0327?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0327 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0327 Acura — Knock Sensor Circuit Low Voltage
- P0327 Audi — Knock Sensor 1 Circuit Low
- P0327 BMW — Knock Sensor Circuit Sensor 1 Error
- P0327 Buick — Knock Sensor Circuit Low Voltage Bank 1
- P0327 Cadillac — Knock Sensor Circuit Low Voltage Bank 1
- P0327 Chevrolet — Knock Sensor Circuit Low Voltage Bank 1
- P0327 GMC — Knock Sensor Circuit Low Voltage Bank 1
- P0327 Honda — Knock Sensor Circuit Low Voltage
- P0327 Hyundai — Knock Sensor 1 Circuit Low Input
- P0327 Infiniti — Knock Sensor Circuit Low Input Bank 1
- P0327 Isuzu — Knock Sensor 1 Circuit Low Frequency
- P0327 KIA — Knock Sensor 1 Circuit Low Input
- P0327 Lexus — Knock Sensor 1 Circuit Low Input
- P0327 Mazda — Knock Sensor Circuit Low Input
- P0327 Mercedes-Benz — Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1
- P0327 MINI — Knock Sensor Circuit Sensor 1 Error
- P0327 Mitsubishi — Knock Sensor Circuit Low Bank 1
- P0327 Nissan — Knock Sensor Circuit Low Input Bank 1
- P0327 Pontiac — Knock Sensor Circuit Low Voltage Bank 1
- P0327 Saturn — Knock Sensor Circuit Low Voltage Bank 1
- P0327 Scion — Knock Sensor 1 Circuit Low Input
- P0327 Subaru — Knock Sensor 1 Circuit Low Input Bank 1 Or Single Sensor
- P0327 Toyota — Knock Sensor 1 Circuit Low Input
- P0327 Volkswagen — Knock Sensor 1 Circuit Low
Frequently Asked Questions about P0327 Code
1. What are the common symptoms of OBDII code P0327 (Knock Sensor Circuit Low Voltage Bank 1)?
- Common symptoms include reduced engine performance, engine knocking or pinging noises, and potential decrease in fuel efficiency.
2. What are the possible causes of OBDII code P0327?
- The code P0327 can be triggered by issues such as a faulty knock sensor, damaged wiring or connectors in the knock sensor circuit, or engine mechanical problems causing knock sensor signal interference.
3. How can I diagnose the cause of OBDII code P0327?
- Diagnosis typically involves inspecting the knock sensor and its wiring for damage, testing the knock sensor's resistance, and using a scan tool to monitor knock sensor data while the engine is running.
4. Can a malfunctioning knock sensor cause other problems besides triggering code P0327?
- Yes, a malfunctioning knock sensor can lead to incorrect ignition timing, reduced engine performance, and potential long-term engine damage if not addressed promptly.
5. What are some repair tips for resolving OBDII code P0327?
- Repair options may include replacing the knock sensor, repairing damaged wiring or connectors, clearing the code with a scan tool after the issue is fixed, and conducting a test drive to ensure the code does not reappear.
6. Is it safe to continue driving with OBDII code P0327 present?
- While the vehicle may still be operable with code P0327, it is recommended to address the issue promptly to prevent potential engine damage and optimize performance and fuel efficiency.
7. Can weather or environmental conditions affect the knock sensor's performance and trigger code P0327?
- Extreme weather conditions or exposure to moisture can potentially impact the knock sensor's functionality and contribute to triggering code P0327.
8. How much does it typically cost to repair OBDII code P0327 at a professional auto repair shop?
- The cost of repairing code P0327 can vary depending on the specific cause of the issue, but it may range from around $150 to $400, including parts and labor.
9. Are there any preventive maintenance steps to avoid encountering OBDII code P0327 in the future?
- Regular engine tune-ups, using high-quality fuel, and ensuring proper engine maintenance can help prevent issues with the knock sensor and reduce the likelihood of encountering code P0327.
10. Can I reset the OBDII code P0327 on my own, or do I need a professional technician to clear it?
- You can attempt to clear the code using an OBDII scan tool, but it is recommended to address the underlying issue causing code P0327 first to prevent it from reoccurring.
Discuss the causes and fixes for P0327 OBDII Code
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