P0387moderate severityPowertrain
Crankshaft Position Sensor B Circuit Low Input
on 2000 Audi A6 2.7L Turbo V6 · AWD
What this code means
The PCM detected an abnormally low voltage signal from crankshaft position sensor B. This can compromise timing accuracy and engine operation.
Symptoms
- Check engine light on
- Hard starting
- Stalling or rough running
Common causes
- Faulty crankshaft position sensor
- Short to ground in wiring
- Corroded connector
- Faulty PCM
Diagnostic steps
- Retrieve codes and freeze frame
- Inspect wiring for shorts to ground
- Check connector and grounds
- Test and replace sensor if needed
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