P0387 – BMW DTC

BMW DTC P0387 – Crankshaft Position Sensor ‘B’ Circuit Low

DTC P0387 meaning on BMW

The DTC P0387 for BMW indicates a low voltage condition in the circuit related to the crankshaft position sensor ‘B’. This fault code is specific to the crankshaft position sensor ‘B’ and is triggered when the voltage in the circuit falls below the specified threshold.

BMW DTC P0387 symptoms

Some common symptoms associated with DTC P0387 on a BMW may include:

• Engine misfires
• Difficulty starting the engine
• Reduced engine performance
• Illuminated check engine light

BMW DTC P0387 causes

The low voltage condition in the crankshaft position sensor ‘B’ circuit that triggers DTC P0387 on a BMW can be caused by various factors, including:

• Wiring issues such as shorts or open circuits
• Corrosion or poor connections in the sensor circuit
• Faulty crankshaft position sensor ‘B’
• ECU (Engine Control Unit) malfunction

BMW DTC P0387 seriousness

While DTC P0387 may not always result in immediate engine failure, it is important to address this issue promptly to prevent potential engine performance issues and further damage. Ignoring this fault code can lead to more severe problems over time.

How to diagnose DTC P0387 on BMW

Diagnosing DTC P0387 on a BMW involves the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data.
2. Inspect the wiring and connectors in the crankshaft position sensor ‘B’ circuit for any visible damage or corrosion.
3. Test the crankshaft position sensor ‘B’ using a multimeter to check for proper voltage and resistance.
4. Check the ECU for any stored fault codes or issues related to the sensor circuit.

How to fix DTC P0387 on BMW

To resolve DTC P0387 on a BMW, you can perform the following actions:

1. Repair any damaged wiring or connectors in the crankshaft position sensor ‘B’ circuit.
2. Replace the faulty crankshaft position sensor ‘B’ with a new, OEM part.
3. If necessary, address any issues with the ECU that may be causing the fault code.

How to erase DTC P0387 on BMW

After fixing the underlying issue causing DTC P0387 on a BMW, you can erase the fault code using a diagnostic scanner. Follow these steps:

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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