AutoCodes – Mercedes-Benz – P0376 Mercedes-Benz

P0376 Mercedes-Benz Code - Timing Reference High Resolution Signal 'B' Too Many Pulses

Quick Answer

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. Common causes include Timing Reference Optical Sensor harness is open or shorted, Timing Reference Optical Sensor circuit poor electrical connection, Faulty Timing Reference Optical Sensor. 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: P0376 Mercedes-Benz indicates Timing Reference High Resolution Signal 'B' Too Many Pulses.
Common causes: Common causes include Timing Reference Optical Sensor harness is open or shorted, Timing Reference Optical Sensor circuit poor electrical connection, Faulty Timing Reference Optical Sensor.
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 2,552

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0376 Mercedes-Benz Description

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing. This test monitors the number of high resolution pulses which have been missed (not detected). It's based on a comparison between the number of pulses that were detected since the last pump cam pulse and the number of the pulses that should have occurred. There are approximately 64 high resolution pulses for every cam pulse.

OBDII Code P0376 Mercedes-Benz - Timing Reference High Resolution Signal 'B' Too Many Pulses - AutoCodes.com — P0376 Mercedes-Benz Code - Timing Reference High Resolution Signal 'B' Too Many Pulses

What does this mean?

What are the Possible Causes of the DTC P0376 Mercedes-Benz?

Timing Reference Optical Sensor harness is open or shorted
Timing Reference Optical Sensor circuit poor electrical connection
Faulty Timing Reference Optical Sensor
Damaged Powertrain Control Module (PCM)

How to Fix the DTC P0376 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0376 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 P0376 Mercedes-Benz code?

Need more information on how to fix the P0376 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0376 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 P0376 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0376 in a Mercedes-Benz?

- Common symptoms include rough engine operation, misfiring, decreased fuel efficiency, and potential stalling.

2. What does the OBDII code P0376 "Timing Reference High Resolution Signal 'B' Too Many Pulses" mean?

- This code indicates that the engine control module (ECM) has detected an excessive number of pulses in the timing reference signal 'B'.

3. What are some possible causes of OBDII code P0376 in a Mercedes-Benz?

- Possible causes include a faulty crankshaft position sensor, damaged wiring or connectors, issues with the ECM, or timing chain/belt problems.

4. How can I diagnose the OBDII code P0376 in my Mercedes-Benz?

- Diagnosis typically involves using a scan tool to read the code, checking the crankshaft position sensor and related components, and inspecting the timing system for any issues.

5. Is it safe to drive my Mercedes-Benz with OBDII code P0376 active?

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

6. Can I reset the OBDII code P0376 in my Mercedes-Benz myself?

- While you can clear the code with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it typically cost to repair OBDII code P0376 in a Mercedes-Benz?

- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the crankshaft position sensor, repairing wiring, or addressing timing system problems.

8. Are there any DIY tips for fixing OBDII code P0376 in a Mercedes-Benz?

- DIY tips may include checking and cleaning the connectors, inspecting wiring for damage, and ensuring proper installation of the crankshaft position sensor.

9. Can a mechanic easily fix OBDII code P0376 in a Mercedes-Benz?

- A qualified mechanic with experience in diagnosing and repairing engine issues should be able to address OBDII code P0376 efficiently by following proper diagnostic procedures.

10. How important is it to address OBDII code P0376 promptly in a Mercedes-Benz?

- It is crucial to address this code promptly to prevent potential engine damage, ensure optimal performance, and maintain the overall reliability of your vehicle.