P0319
Rough Road Sensor "B"
- Severity
- Low
- Driving
- Drivable — book it in
A fault in the rough road sensor "B" circuit. This sensor tells the module when the road surface is rough, so that the crankshaft speed variations caused by bumps are not counted as engine misfires. With it faulty, misfire detection becomes unreliable.
Possible causes
- CommonRough road sensor or its wiring faulty
- CommonSensor not fitted, or removed during previous work
- CommonModule expecting the option because it is coded for a different specification
- PossibleABS or wheel speed fault, where the rough road signal comes from that module
- PossibleCorroded connector
What you might notice
- Check engine light on
- Misfire codes appearing on poor road surfaces
- Misfire detection disabled
- Often no symptom the driver notices
What to check, in order
- Check the connector and wiring at the sensor.
- Check for ABS or wheel speed codes - on many vehicles the rough road signal is derived there rather than from a dedicated sensor.
- Treat any misfire codes stored alongside with suspicion, particularly ones that appeared on a bad road.
- Confirm the engine actually feels like it is misfiring before chasing misfire codes.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Ignition system or misfire
P0300P0301P0302P0303P0304P0305P0306P0307P0308P0309P0310P0311P0312P0313P0314P0315P0316P0317P0318P0319P0320P0321P0322P0323P0324P0325P0326P0327P0328P0329P0330P0331P0332P0333P0334P0335P0336P0337P0338P0339P0340P0341P0342P0343P0344P0345P0346P0347P0348P0349P0350P0351P0352P0353P0354P0355P0356P0357P0358P0359P0360P0361P0362P0363P0364P0365P0366P0367P0368P0369P0370P0371P0372P0373P0374P0375P0376P0377P0378P0379P0380P0381P0382P0383P0384P0385P0386P0387P0388P0389P0390P0391P0392P0393P0394