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P0337 Mercedes-Benz Code - Crankshaft Position Sensor 'A' Circuit Low Input

Quick Answer

The P0337 diagnostic trouble code (DTC) for Mercedes-Benz vehicles indicates that there is a low input signal detected from the crankshaft position sensor 'A' circuit. Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections. 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
P0337 Mercedes-Benz indicates Crankshaft Position Sensor 'A' Circuit Low Input.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P0337 Mercedes-Benz Description

The P0337 diagnostic trouble code (DTC) for Mercedes-Benz vehicles indicates that there is a low input signal detected from the crankshaft position sensor 'A' circuit. The crankshaft position sensor is a critical component in the engine management system, responsible for monitoring the position and speed of the crankshaft. This information is essential for the engine control unit (ECU) to accurately determine the ignition timing, fuel injection timing, and other engine functions.

OBDII Code P0337 Mercedes-Benz - Crankshaft Position Sensor 'A' Circuit Low Input
P0337 Mercedes-Benz Code - Crankshaft Position Sensor 'A' Circuit Low Input

Common Causes of P0337 Mercedes-Benz

  1. Faulty crankshaft position sensor.
  2. Damaged wiring or connectors in the sensor circuit.
  3. Corrosion or contamination in the sensor connections.
  4. ECU malfunction or software issues.
  5. Physical damage to the sensor due to external factors.

Symptoms of P0337 Mercedes-Benz

  1. Engine misfires or hesitation during acceleration.
  2. Rough idling or stalling of the engine.
  3. Decreased fuel efficiency.
  4. Check Engine Light illuminated on the dashboard.
  5. Difficulty starting the engine.

How to Fix P0337 Mercedes-Benz

  1. Begin by diagnosing the issue using a diagnostic scan tool to retrieve the specific fault code and pinpoint the exact cause of the low input signal.
  2. Inspect the crankshaft position sensor and its wiring for any visible damage, corrosion, or loose connections. Replace or repair any damaged components as needed.
  3. Test the sensor using a multimeter to check for proper resistance and signal output. Replace the sensor if it fails the test.
  4. Clear the DTC from the ECU memory using the scan tool and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECU or other related components.

Cost to Fix P0337 Mercedes-Benz

The cost of repairing a P0337 code for a Mercedes-Benz vehicle can vary depending on the specific model, year, and the extent of the issue. On average, the parts for a new crankshaft position sensor can range from $50 to $150, while labor costs can range from $100 to $200. Overall, the total repair cost for this issue may typically fall between $150 and $350. However, it's essential to consider that labor rates and diagnostic fees at auto repair shops can fluctuate, so it's advisable to consult with a trusted mechanic or dealership for an accurate estimate based on your vehicle's requirements.

What does this mean?

Tech Notes for P0337 Mercedes-Benz

Sometimes and in some models, low battery voltage or a weak starter can trigger a Crankshaft Position Sensor code. Before replacing any parts, recharge or replaced battery.

When is the Code Detected?

The crankshaft position sensor (POS) signal sent to the Electronic Control Module (ECM) is low

Need more information about the P0337 Mercedes-Benz code?

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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 P0337 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0337 in a Mercedes-Benz related to the Crankshaft Position Sensor 'A' Circuit Low Input?

- Common symptoms include rough idling, engine stalling, difficulty starting the vehicle, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P0337 in a Mercedes-Benz?

- The code P0337 can be triggered by a faulty crankshaft position sensor, wiring issues, a damaged sensor connector, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P0337 in my Mercedes-Benz?

- To diagnose the issue, you can perform a visual inspection of the sensor and its wiring, use a scan tool to read the code and live data, and conduct specific tests on the sensor's circuitry.

4. Can I continue driving my Mercedes-Benz with OBDII code P0337 present?

- It is not recommended to drive with the code P0337 as it can lead to further engine damage or unexpected stalling, which may compromise your safety on the road.

5. How can I repair OBDII code P0337 in my Mercedes-Benz?

- Repairing the issue involves replacing the faulty crankshaft position sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

6. Are there any tips to prevent OBDII code P0337 from occurring in my Mercedes-Benz?

- Regular maintenance, such as inspecting and replacing sensors as needed, checking the wiring harness for damage, and keeping the engine control module in good condition, can help prevent this code from appearing.

7. How much does it typically cost to repair OBDII code P0337 in a Mercedes-Benz at a dealership or a repair shop?

- The cost of repairing OBDII code P0337 can vary depending on the location, the labor rates, and whether genuine Mercedes-Benz parts are used. It is advisable to get estimates from different shops before proceeding with the repair.

8. Can a DIY enthusiast fix OBDII code P0337 in a Mercedes-Benz?

- If you have the necessary tools, knowledge, and experience working on automotive electrical systems, you may be able to replace the crankshaft position sensor and address the wiring issues yourself. However, it is recommended to consult a professional if you are unsure.

9. Will resetting the OBDII code P0337 in my Mercedes-Benz make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P0337 is not addressed, the code is likely to reappear once the vehicle is driven again.

10. Is OBDII code P0337 in a Mercedes-Benz a common issue among owners?

- While not as common as some other OBDII codes, P0337 related to the crankshaft position sensor can occur in older Mercedes-Benz models or vehicles with high mileage, especially if regular maintenance has been neglected.

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