AutoCodes – Mercedes-Benz – P0327 Mercedes-Benz

P0327 Mercedes-Benz Code - Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when a combustion anomaly is detected. Common causes include Faulty Knock Sensor, Knock Sensor harness is open or shorted, Knock Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0327 Mercedes-Benz indicates Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1.
Common causes: Common causes include Faulty Knock Sensor, Knock Sensor harness is open or shorted, Knock Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,254

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 15, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0327 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) when a combustion anomaly is detected. When irregular combustion takes place a detectable knock or vibration occurs. This acts on the knock sensor and causes a voltage to be generated by the component. The ECM then uses the output from the camshaft position sensor to calculate the knock window for a given ignition event. The knock window is the angular period, in crankshaft rotation, when combustion knock can occur. If the knock sensor produces a voltage outside of the knock window, the signal will be ignored. For correct operation of the knock sensor, the component must be torqued to the correct tightness and the retaining bolt must be replaced after it has been removed. The engine lubrication system should also be inspected as a fault here could result in false knock sensor codes being generated.

OBDII Code P0327 Mercedes-Benz - Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1 - AutoCodes.com — P0327 Mercedes-Benz Code - Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1

What does this mean?

What are the Possible Causes of the DTC P0327 Mercedes-Benz?

Faulty Knock Sensor
Knock Sensor harness is open or shorted
Knock Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0327 Mercedes-Benz?

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.

What does this mean?

Code Tech Notes

Mercedes Benz Code = 0502 (knock sensor 1, right) has a short circuit to ground. (P0327)

The P0327 code means that the Knock Sensor is not working correctly. Problems with the knock sensor will not cause engine performance problems. Replacing the knock sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0327 Mercedes-Benz 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.

Need more information about the P0327 Mercedes-Benz code?

Need more information on how to fix the P0327 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0327 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0327 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0327 in a Mercedes-Benz related to the Knock/Combustion Vibration Sensor 1 Circuit Low Bank 1?

- Common symptoms include engine knocking or pinging noises, reduced engine performance, and potential stalling.

2. What are the possible causes of OBDII code P0327 in a Mercedes-Benz?

- The code P0327 can be triggered by a faulty knock sensor, wiring issues, poor electrical connections, or engine mechanical problems.

3. How can I diagnose the cause of OBDII code P0327 in my Mercedes-Benz?

- Diagnose the code by inspecting the knock sensor and its wiring for damage, testing the sensor's resistance, and checking the sensor's signal output.

4. Can a faulty knock sensor cause other issues in a Mercedes-Benz besides triggering OBDII code P0327?

- Yes, a faulty knock sensor can lead to poor fuel economy, increased emissions, and potential damage to the engine if not addressed promptly.

5. What are the repair options for fixing OBDII code P0327 in a Mercedes-Benz?

- Repair options include replacing the knock sensor, repairing or replacing damaged wiring, ensuring secure electrical connections, and addressing any underlying engine issues.

6. Is it safe to continue driving my Mercedes-Benz with OBDII code P0327 present?

- It is not recommended to drive the vehicle with code P0327 present, as it can lead to engine performance issues and potential damage if left unresolved.

7. Can a DIY enthusiast repair OBDII code P0327 in a Mercedes-Benz, or is it best left to professionals?

- While some DIY enthusiasts may be able to replace the knock sensor themselves, diagnosing and repairing electrical or engine-related issues may require professional expertise.

8. Are there any preventative measures to avoid triggering OBDII code P0327 in a Mercedes-Benz?

- Regular maintenance, such as checking and replacing worn-out sensors, ensuring proper wiring connections, and addressing engine performance issues promptly, can help prevent code P0327.

9. How long does it typically take to repair OBDII code P0327 in a Mercedes-Benz?

- The repair time can vary depending on the specific issue causing the code, but replacing a knock sensor or repairing wiring connections can typically be done within a few hours.

10. Will resetting the OBDII system clear code P0327 in a Mercedes-Benz, or does the underlying issue need to be fixed first?

- Resetting the OBDII system may temporarily clear the code, but it will likely return if the underlying issue, such as a faulty knock sensor, is not repaired.