OBD-II code · Powertrain (generic)
P0389 Crankshaft Position Sensor B Circuit Intermittent
Crank sensor B signal jumps or drops out intermittently — connector or wiring issue. 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.
Is it safe to drive with P0389?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Crankshaft Position Sensor
Related codes
- P0339Crankshaft Position Sensor A Circuit Intermittent
- P0385Crankshaft Position Sensor B Circuit
- P0386Crankshaft Position Sensor B Circuit Range/Performance
- P0387Crankshaft Position Sensor B Circuit Low
- P0388Crankshaft Position Sensor B Circuit High
- P038AIgnition I Control Signal Circuit/Open
- P038BIgnition I Control Signal Circuit Low
- P038CIgnition I Control Signal Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.