P0377 – BMW DTC

BMW DTC P0377 – Timing Reference High Resolution Signal ‘B’ Too Few Pulses

DTC P0377 meaning on BMW

The Diagnostic Trouble Code (DTC) P0377 for BMW indicates that the Timing Reference High Resolution Signal ‘B’ has too few pulses. This signal is crucial for the engine control module to accurately determine the engine’s timing and fuel injection. When the number of pulses in the signal falls below the expected threshold, it can lead to performance issues and potential engine misfires.

BMW DTC P0377 symptoms

Symptoms associated with DTC P0377 on a BMW may include:

• Engine misfires
• Reduced engine performance
• Difficulty starting the engine
• Illuminated Check Engine Light

BMW DTC P0377 causes

The common causes of DTC P0377 on a BMW include:

• Faulty crankshaft position sensor
• Wiring or connection issues in the timing reference signal circuit
• Engine timing chain or belt problems
• Issues with the engine control module

BMW DTC P0377 seriousness

Ignoring or neglecting DTC P0377 on a BMW can lead to more severe engine performance issues, potential damage to engine components, and increased fuel consumption. It is essential to address this code promptly to prevent further complications.

How to diagnose DTC P0377 on BMW

To diagnose DTC P0377 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes and verify the presence of P0377.
2. Inspect the crankshaft position sensor and its wiring for any visible damage or corrosion.
3. Check the timing reference signal circuit for continuity and proper connections.
4. Perform a visual inspection of the engine timing components for any signs of wear or damage.

How to fix DTC P0377 on BMW

To fix DTC P0377 on a BMW, you can take the following actions:

1. Replace the faulty crankshaft position sensor if it is determined to be the cause of the issue.
2. Repair any damaged wiring or connections in the timing reference signal circuit.
3. Address any problems with the engine timing chain or belt if necessary.
4. If the engine control module is faulty, consider reprogramming or replacing it.

How to erase DTC P0377 on BMW

To erase DTC P0377 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the engine control module’s memory. After addressing the underlying cause of the code and making the necessary repairs, clearing the code will reset the Check Engine Light and ensure that the issue has been resolved.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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