P0394 – BMW DTC

BMW DTC P0394 – Camshaft Position Sensor ‘B’ Circuit Intermittent (Bank 2)

DTC P0394 meaning on BMW

The Diagnostic Trouble Code (DTC) P0394 for BMW refers to a fault in the Camshaft Position Sensor ‘B’ Circuit on Bank 2. This code indicates that the Engine Control Module (ECM) has detected an intermittent issue with the camshaft position sensor signal on the second bank of the engine.

BMW DTC P0394 symptoms

Symptoms of DTC P0394 on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Engine running rough or misfiring
• Reduced engine performance
• Difficulty starting the engine

BMW DTC P0394 causes

Common causes of DTC P0394 on a BMW include:

• Faulty camshaft position sensor ‘B’
• Wiring or connector issues in the camshaft position sensor circuit
• ECM software or hardware problems

BMW DTC P0394 seriousness

While DTC P0394 may not always result in immediate engine failure, it is important to address this issue promptly to prevent potential damage to the engine and ensure optimal performance.

How to diagnose DTC P0394 on BMW

To diagnose DTC P0394 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the camshaft position sensor ‘B’ and its wiring for any visible damage or corrosion
3. Check the sensor’s signal using a multimeter to ensure it is within specifications
4. Perform a visual inspection of the ECM connectors and wiring for any issues

How to fix DTC P0394 on BMW

To fix DTC P0394 on a BMW, you can try the following solutions:

1. Replace the faulty camshaft position sensor ‘B’
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Update the ECM software if necessary

How to erase DTC P0394 on BMW

To erase DTC P0394 on a BMW, you can clear the fault code using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. However, it is recommended to address the underlying issue causing the fault code before clearing it to prevent it from reoccurring.

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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.