Damaged, chafed or corroded wiring or connector in the rough road sensor B signal circuit; Faulty rough road sensor or accelerometer, where fitted; Fault with a wheel speed sensor or ABS module supplying the rough road signal; Data communication fault between the ABS or stability control module and the engine control unit; Poor power or earth supply to the sensor or related module; Internal fault in the engine control unit or outdated software.

P0319

Rough Road Sensor B Signal Circuit.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
3: AreaIgnition system or misfire
19: FaultThe specific fault in that area

What it means

P0319 is the generic code for a fault in the signal circuit of rough road sensor B. The engine control unit uses rough road information, often from an ABS wheel speed sensor, an accelerometer or a data link, to tell crankshaft speed fluctuations caused by bumpy surfaces from real misfires. The code sets when the signal from sensor B is missing, implausible or outside its expected range. How the rough road signal is produced and which sensor is 'B' varies by model and engine.

Symptoms

Engine warning light on
Traction control or ABS warning light on at the same time
Misfire detection disabled or false misfire codes on rough roads
Slight hesitation or uneven running on bumpy surfaces
No noticeable change in driveability

Possible causes

Damaged, chafed or corroded wiring or connector in the rough road sensor B signal circuitlikely
Faulty rough road sensor or accelerometer, where fittedpossible
Fault with a wheel speed sensor or ABS module supplying the rough road signallikely
Data communication fault between the ABS or stability control module and the engine control unitpossible
Poor power or earth supply to the sensor or related modulepossible
Internal fault in the engine control unit or outdated softwarerare

How to diagnose

Read all stored codes and freeze frame data, noting any ABS, traction control, network or misfire codes alongside P0319
Check manufacturer information for how this vehicle produces its rough road signal and where sensor B is located
Inspect the sensor, wiring and connectors for chafing, water ingress, corrosion and loose pins
Check live data for the rough road signal and wheel speeds, comparing them with a road test on smooth and rough surfaces
Test the sensor supply voltage, earth and signal wire for continuity, shorts and resistance against specification
Check the battery condition and charging voltage, as low voltage can cause spurious signal faults
Test network communication between the ABS module and the engine control unit
Check for applicable software updates for the engine control unit once wiring and sensors have been ruled out

How to fix

Repair or replace damaged wiring and clean or replace corroded connectors
Replace the faulty rough road sensor or accelerometer
Repair or replace the faulty wheel speed sensor or ABS component supplying the signal
Rectify network or communication faults between modules
Correct power or earth supply problems
Update the engine control unit software if an outdated calibration is a known cause for this model, or replace the unit if confirmed faulty

Can I keep driving?

Low severity

The car can normally be driven as the fault mainly affects misfire monitoring on rough roads. Book it in soon, especially if ABS or traction control warnings are also showing, as those systems may be affected.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.