P0377 Code - Timing Reference High Resolution Signal 'B' Too Few Pulses
Quick Answer
The P0377 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected that the timing reference high-resolution signal 'B' has too few pulses. Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Wiring or connection issues in the signal circuit. 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
- P0377 indicates Timing Reference High Resolution Signal 'B' Too Few Pulses.
- Common causes
- Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Wiring or connection issues in the signal circuit.
- 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 P0377 Description
The P0377 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected that the timing reference high-resolution signal 'B' has too few pulses. This signal is crucial for the ECM to accurately control the ignition timing of the engine. When there are too few pulses in the signal, it can lead to incorrect ignition timing, which can result in poor engine performance, reduced fuel efficiency, and potential engine damage if not addressed promptly.
Common Causes of P0377
- Faulty crankshaft position sensor
- Faulty camshaft position sensor
- Wiring or connection issues in the signal circuit
- ECM software or hardware issues
- Engine mechanical problems affecting sensor readings
Symptoms of P0377
- Rough idling
- Misfires
- Hesitation or stumbling during acceleration
- Decreased power and acceleration
- Increased fuel consumption
How to Fix P0377
- Use a scan tool to read and record the freeze frame data associated with the P0377 code.
- Perform a visual inspection of the wiring and connectors related to the timing reference high-resolution signal 'B'.
- Test the crankshaft and camshaft position sensors using a multimeter to ensure they are functioning correctly.
- Check the ECM for any software updates or malfunctions that may be causing the issue.
- If necessary, replace the faulty sensor or repair any wiring issues to restore the correct signal to the ECM.
Cost to Fix P0377
The cost of repairing a P0377 code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a faulty sensor or repairing wiring issues can range from $100 to $300, including parts and labor. However, additional diagnostic time may be required to pinpoint the exact cause of the problem, which can increase the overall cost. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.
When is the Code Detected?
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Code P0377 Information for Specific Makes
- P0377 Mercedes-Benz — Timing Reference High Resolution Signal 'B' Too Few Pulses
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