P0379 Mercedes-Benz Code - Timing Reference High Resolution Signal 'B' No 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
- P0379 Mercedes-Benz indicates Timing Reference High Resolution Signal 'B' No 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.
Code P0379 Mercedes-Benz Description
What are the Possible Causes of the DTC P0379 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 P0379 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 P0379 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 P0379 Mercedes-Benz code?
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Frequently Asked Questions about P0379 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0379 in a Mercedes-Benz related to Timing Reference High Resolution Signal 'B' No Pulses?
The common symptoms include rough idling, engine misfires, poor acceleration, and in some cases, the vehicle may not start.
2. What are the possible causes of OBDII code P0379 in a Mercedes-Benz?
Potential causes of this code include a faulty crankshaft position sensor, damaged wiring or connectors in the timing reference circuit, issues with the engine's timing chain, or a malfunctioning engine control module (ECM).
3. How can I diagnose the root cause of OBDII code P0379 in my Mercedes-Benz?
Diagnosis typically involves using a scan tool to retrieve the code and then inspecting the crankshaft position sensor, checking the wiring and connectors for any damage, and verifying the engine's timing chain condition. Additionally, testing the ECM for proper functioning may be necessary.
4. Are there any common repair tips for resolving OBDII code P0379 in a Mercedes-Benz?
One common repair tip is to first inspect and potentially replace the crankshaft position sensor, as it is often the culprit behind this code. Ensuring the timing chain is properly aligned and in good condition is also crucial. Finally, checking and repairing any damaged wiring or connectors in the timing reference circuit can help resolve the issue.
5. Can OBDII code P0379 in a Mercedes-Benz cause any serious damage if not addressed promptly?
If left unresolved, this code can lead to more severe engine performance issues, potentially causing further damage to engine components over time. It is recommended to address the issue promptly to prevent any long-term damage.
6. Is it safe to continue driving my Mercedes-Benz with OBDII code P0379 present?
It is not advisable to continue driving the vehicle with this code present, as it can affect the engine's performance and potentially lead to further damage. It is recommended to address the issue and have the necessary repairs done as soon as possible.
7. Can a DIY enthusiast repair OBDII code P0379 in a Mercedes-Benz, or is professional help recommended?
While some experienced DIY enthusiasts may be able to diagnose and repair this code themselves, it is recommended to seek professional help, especially when dealing with complex engine components like the timing reference circuit and the ECM. Professional expertise can ensure proper diagnosis and repair of the issue.
8. How much does it typically cost to repair OBDII code P0379 in a Mercedes-Benz?
The cost of repairing this code can vary depending on the root cause of the issue, the extent of the repair needed, and labor rates in your area. It is advisable to consult with a trusted mechanic or dealership for an accurate estimate of the repair costs.
9. Are there any preventive measures to avoid OBDII code P0379 from occurring in a Mercedes-Benz?
Regular maintenance of the engine components, such as the crankshaft position sensor and timing chain, can help prevent issues that may trigger this code. Following the manufacturer's recommended maintenance schedule and addressing any engine performance issues promptly can also help avoid this code.
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