P0319 Rough Road Sensor B Signal Circuit

P0319 indicates a signal circuit issue for Rough Road Sensor B. This input helps the controller recognize road-induced crankshaft speed variation instead of mistaking it for a misfire.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear P0319 and ignore it if misfire codes return on rough roads or during wheel-speed related faults.

Symptoms of P0319

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0319

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Compare Rough Road Sensor B data with wheel speed, ABS module faults, vehicle speed, freeze-frame conditions, and rough-road monitor status.
Inspect the sensor B circuit for opens, shorts, poor grounds, connector corrosion, mounting problems, and harness damage from heat or movement.
Check whether the signal is missing, stuck, noisy, or only fails during vibration, moisture, or suspension movement.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.