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P0371 Mercedes-Benz Code - Timing Reference High Resolution Signal 'A' Too Many Pulses

Quick Answer

The P0371 diagnostic trouble code (DTC) for Mercedes-Benz vehicles indicates that the Timing Reference High Resolution Signal 'A' has too many pulses. Common causes include Faulty crankshaft position sensor, Wiring or connector issues in the crankshaft position sensor circuit, ECM software or hardware malfunction. 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
P0371 Mercedes-Benz indicates Timing Reference High Resolution Signal 'A' Too Many Pulses.
Common causes
Common causes include Faulty crankshaft position sensor, Wiring or connector issues in the crankshaft position sensor circuit, ECM software or hardware malfunction.
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 12, 2024
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Code P0371 Mercedes-Benz Description

The P0371 diagnostic trouble code (DTC) for Mercedes-Benz vehicles indicates that the Timing Reference High Resolution Signal 'A' has too many pulses. This code typically points to an issue with the high-resolution timing reference signal coming from the crankshaft position sensor. The engine control module (ECM) uses this signal to determine the precise position of the crankshaft and control the ignition timing and fuel injection. When the ECM detects too many pulses in the signal, it can lead to incorrect timing of the engine, causing performance issues and potentially damaging components.

OBDII Code P0371 Mercedes-Benz - Timing Reference High Resolution Signal 'A' Too Many Pulses
P0371 Mercedes-Benz Code - Timing Reference High Resolution Signal 'A' Too Many Pulses

Common Causes of P0371 Mercedes-Benz

  1. Faulty crankshaft position sensor
  2. Wiring or connector issues in the crankshaft position sensor circuit
  3. ECM software or hardware malfunction
  4. Timing chain or belt issues affecting signal accuracy
  5. Engine mechanical problems affecting timing signal synchronization

Symptoms of P0371 Mercedes-Benz

  1. Engine misfires or runs rough
  2. Reduced engine performance and power
  3. Difficulty starting the engine
  4. Illuminated check engine light
  5. Engine stalling or hesitation

How to Fix P0371 Mercedes-Benz

  1. Diagnose the issue by using a scan tool to read the DTC and check the crankshaft position sensor signal.
  2. Inspect the wiring and connectors related to the crankshaft position sensor for any damage or corrosion.
  3. Replace the crankshaft position sensor if it is found to be faulty.
  4. Check and adjust the timing chain or belt if necessary to ensure proper signal synchronization.
  5. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0371 Mercedes-Benz

The typical repair costs for addressing the P0371 code on a Mercedes-Benz vehicle can range from $200 to $500, including parts and labor. However, the actual cost may vary depending on the specific model of the vehicle, the location of the repair shop, and any additional components that need to be replaced. It is recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's unique circumstances. Keep in mind that diagnostic time and labor rates can influence the overall cost of the repair.

When is the Code Detected?

There are too many high resolution pulses from the optical sensor to the PCM

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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 P0371 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0371 in a Mercedes-Benz?

- Common symptoms include rough idling, engine misfires, poor acceleration, and potential stalling.

2. What does the OBDII code P0371 'Timing Reference High Resolution Signal 'A' Too Many Pulses' mean for a Mercedes-Benz?

- This code indicates that the Engine Control Module (ECM) has detected too many pulses in the high-resolution signal from the camshaft position sensor 'A.'

3. What are the possible causes of OBDII code P0371 in a Mercedes-Benz?

- Possible causes include a faulty camshaft position sensor 'A,' damaged wiring or connectors, incorrect timing belt installation, or a malfunctioning ECM.

4. How can I diagnose OBDII code P0371 in my Mercedes-Benz?

- Diagnosis involves using a scan tool to retrieve the code, checking the camshaft position sensor 'A' and its wiring for damage, and verifying the timing belt alignment.

5. Is it safe to drive my Mercedes-Benz with OBDII code P0371 active?

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

6. Can I repair OBDII code P0371 in my Mercedes-Benz myself?

- Depending on your skill level, you may be able to replace the camshaft position sensor 'A' or repair damaged wiring yourself. However, complex timing belt adjustments may require professional assistance.

7. Will resetting the fault codes make OBDII code P0371 go away in my Mercedes-Benz?

- Resetting the fault codes may temporarily clear the code, but if the underlying issue causing P0371 is not addressed, the code is likely to reappear upon driving.

8. How much does it typically cost to repair OBDII code P0371 in a Mercedes-Benz?

- The cost of repair can vary based on the exact cause of the code and whether professional labor is required. Replacement of the camshaft position sensor 'A' can range from $100 to $300.

9. Can a faulty camshaft position sensor 'A' cause other issues besides triggering OBDII code P0371 in a Mercedes-Benz?

- Yes, a faulty camshaft position sensor 'A' can also cause poor fuel efficiency, difficulty starting the engine, and potential loss of power while driving.

10. How often should I have my Mercedes-Benz inspected to prevent OBDII code P0371 from occurring?

- It's recommended to follow the manufacturer's recommended maintenance schedule, including regular inspections of sensors and components related to engine timing, to help prevent issues like OBDII code P0371.

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