Engine

P0319 — Rough Road Sensor B Signal Circuit Malfunction

Severity: low Safe to drive

What P0319 means

The engine control module detected an abnormal or invalid signal in the rough road sensor B circuit. That signal, or wheel speed data shared over the network, helps the module tell road vibration from a real misfire. When it is unreliable, misfire monitoring becomes less accurate.

Symptoms

  • Check Engine light on
  • ABS or traction control lights may come on
  • False misfire counts on rough roads
  • Rough running on uneven pavement
  • Sometimes no noticeable symptoms

Possible causes

  1. Damaged wiring or a poor connection at the sensor connector
  2. Faulty rough road sensor B (where the vehicle has a separate one)
  3. Faulty wheel speed sensor feeding the rough road logic
  4. Corrosion or moisture in the connector
  5. ECM software or calibration issue (uncommon)

How to diagnose

  1. Scan all codes and freeze frame data, noting any ABS or wheel speed codes
  2. Check for misfire codes (P0300–P030x) and address those first
  3. Inspect the harness and connector for chafing, corrosion and water intrusion
  4. Test power, ground and signal wires with a multimeter using the wiring diagram for your model
  5. Compare live wheel speed readings on a scan tool while driving
  6. Test the sensor against manufacturer specifications
  7. Check for ECM software updates or service bulletins

Common fixes

  • Repair the wiring or replace a damaged connector
  • Replace rough road sensor B
  • Replace a faulty wheel speed sensor
  • Update the ECM software if a update is available
  • Clear codes and confirm the fault does not return

Questions and answers

What does P0319 mean?

It is a signal circuit fault for rough road sensor B. The control module doesn't trust the signal, so it is worse at telling road bumps from engine misfires.

Can I drive with P0319?

Usually yes, as it has little effect on how the engine runs. Still, get it checked soon because misfire monitoring may not work correctly.

Why is my ABS light on with P0319?

Wheel speed data is often used to detect rough roads. A faulty wheel speed sensor or its wiring can set both the ABS light and this code.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.