Powertrain
generic / SAE
P0387
Crankshaft Position Sensor B Circuit Low
Crank sensor B below lower plausibility — short to ground. The crankshaft position sensor provides RPM and crank angle — without a valid signal, no ignition and no injection. Engine will not start or stalls instantly.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 87
Possible causes
- Short to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: crankshaft position sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012