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P0373 Mercedes-Benz Code - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses

Quick Answer

The P0373 diagnostic trouble code for Mercedes-Benz vehicles indicates an issue with the Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses. Common causes include Faulty crankshaft or camshaft position sensors, Damaged wiring or connectors to the sensors, Failing ECM. 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
P0373 Mercedes-Benz indicates Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses.
Common causes
Common causes include Faulty crankshaft or camshaft position sensors, Damaged wiring or connectors to the sensors, Failing ECM.
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 09, 2024
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Code P0373 Mercedes-Benz Description

The P0373 diagnostic trouble code for Mercedes-Benz vehicles indicates an issue with the Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses. This code typically signifies that there is a problem with the signal that the engine control module (ECM) is receiving from the crankshaft position sensor or camshaft position sensor. These sensors play a crucial role in ensuring proper timing of the engine's combustion cycle. When the ECM detects intermittent or erratic pulses from these sensors, it can lead to misfires, poor engine performance, and potentially serious engine damage if left unresolved.

OBDII Code P0373 Mercedes-Benz - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses
P0373 Mercedes-Benz Code - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses

Common Causes of P0373 Mercedes-Benz

  1. Faulty crankshaft or camshaft position sensors
  2. Damaged wiring or connectors to the sensors
  3. Failing ECM
  4. Timing chain or belt issues
  5. Poor quality fuel or contaminated fuel

Symptoms of P0373 Mercedes-Benz

  1. Rough idling or engine hesitation
  2. Stumbling or jerking during acceleration
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Illumination of the check engine light

How to Fix P0373 Mercedes-Benz

  1. Begin by performing a thorough diagnostic scan to confirm the P0373 code and identify any other related codes.
  2. Inspect the crankshaft and camshaft position sensors for any signs of damage or wear. Replace as necessary.
  3. Check the wiring and connectors for the sensors for any breaks, corrosion, or poor connections. Repair or replace as needed.
  4. Test the ECM for proper functioning and replace if it is found to be faulty.
  5. Inspect the timing chain or belt for proper tension and alignment. Make any adjustments or replacements as necessary.

Cost to Fix P0373 Mercedes-Benz

The cost estimate for resolving a P0373 code can vary depending on the specific cause of the issue. In general, parts such as sensors or wiring components can range from $50 to $200, while labor costs can vary between $100 and $300. The total repair cost can therefore range from $150 to $500 or more. It is important to factor in additional costs for diagnostic testing and any potential related repairs that may be required. Remember that labor rates can vary significantly based on location, shop rates, and the complexity of the repair. It is advisable to obtain quotes from multiple repair facilities to ensure a competitive price.

When is the Code Detected?

Some high resolution pulses are intermittent 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 P0373 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0373 in a Mercedes-Benz related to Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses?

- Common symptoms include rough engine performance, misfires, stalling, and difficulty starting the vehicle.

2. What can cause the OBDII code P0373 to trigger in a Mercedes-Benz?

- The code P0373 is triggered when there are intermittent or erratic pulses detected in the high-resolution signal 'A', often caused by a faulty crankshaft position sensor, wiring issues, or a malfunctioning engine control module.

3. How can I diagnose the OBDII code P0373 in my Mercedes-Benz?

- Diagnosing the code P0373 involves performing a thorough inspection of the crankshaft position sensor, checking the wiring for any damage or loose connections, and using a diagnostic scanner to monitor the signal from the sensor.

4. Can driving with the OBDII code P0373 in a Mercedes-Benz cause further damage to the vehicle?

- Continuing to drive with the code P0373 present can potentially lead to more severe engine issues, such as permanent damage to engine components or complete engine failure.

5. What are some repair tips for addressing the OBDII code P0373 in a Mercedes-Benz?

- Repair tips include replacing the faulty crankshaft position sensor, repairing any damaged wiring, and resetting the engine control module to clear the code.

6. Is it safe to reset the OBDII code P0373 in a Mercedes-Benz without addressing the underlying issue?

- It is not recommended to simply reset the code without addressing the root cause, as the issue will likely reoccur and could lead to more significant problems with the vehicle.

7. How much does it typically cost to repair the OBDII code P0373 in a Mercedes-Benz?

- The cost of repairing the code P0373 can vary depending on the exact cause of the issue, but it may range from $200 to $500 for parts and labor.

8. Can a DIY enthusiast with basic mechanical skills fix the OBDII code P0373 in a Mercedes-Benz?

- While some DIY enthusiasts may be able to replace the crankshaft position sensor themselves, diagnosing and repairing the code P0373 may require specialized tools and expertise, so it is often best left to professional mechanics.

9. How urgent is it to address the OBDII code P0373 in a Mercedes-Benz?

- It is important to address the code P0373 promptly to prevent further damage to the engine and ensure the vehicle operates safely and efficiently.

10. Are there any recalls or technical service bulletins related to the OBDII code P0373 in Mercedes-Benz vehicles?

- It is recommended to check with a Mercedes-Benz dealership or the manufacturer's website for any recalls or technical service bulletins related to the code P0373 to see if there are any known issues or solutions provided by the manufacturer.

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