P0319 medium Severity

P0319: Rough Road Sensor B Signal Circuit Malfunction

Possible erratic misfire reporting or drivability issues, may illuminate ABS/traction warnings; does not typically prevent engine operation but can affect misfire detection and performance.

Overview

OBD-II code P0319 indicates the Engine/PCM has detected an abnormal or invalid signal in the Rough Road Sensor B circuit, impacting misfire detection logic and potentially linked to ABS/wheel speed inputs affecting PCM rough road compensation.

Common Symptoms

  • Check Engine Light/MIL illuminated
  • ABS or traction control warning lights
  • Erratic misfire counts or rough running on uneven roads
  • PCM misinterpreting road noise as engine misfire

Most Common Causes

Faulty Rough Road Sensor B or associated circuit medium

Sensor itself may fail or produce invalid signals to the PCM due to age or internal fault.

Wiring harness damage or poor connector integrity high

Open circuits, shorts, corrosion, or poor pin contact between sensor and PCM are common.

Related wheel speed sensor fault affecting rough road logic medium

Some vehicles use wheel speed inputs for rough road detection; faults upstream can trigger P0319.

PCM/ECM software calibration issue low

Rare cases may require manufacturer software update; check service bulletins specific to make/model.

Diagnostic Steps

  1. Verify P0319 with a professional scan tool and review freeze-frame data.
    Expected: Confirm code presence and operating conditions when set.
    Interpretation: Ensures correct DTC and avoids misinterpretation with temporary faults.
  2. Inspect Rough Road Sensor B wiring, connectors, and harness for damage or corrosion.
    Expected: No broken wires, corrosion, or loose pins.
    Interpretation: Damaged wiring/connectors often cause signal issues triggering the code.
  3. Check related wheel speed sensors and ABS data for abnormalities.
    Expected: All wheel speed inputs within normal ranges.
    Interpretation: Faults in wheel speed data can affect rough road detection logic.
  4. Test sensor circuit voltage and signal continuity per OEM procedures.
    Expected: Sensor receives proper supply and returns valid signal to PCM.
    Interpretation: Verifies correct electrical function of sensor and circuit.
  5. Replace Rough Road Sensor B if wiring and connectors check good but fault persists.
    Expected: Code should clear and not return after test drive.
    Interpretation: Confirms sensor as root cause.

Repair Solutions

Repair or replace damaged wiring/connectors to Rough Road Sensor B medium
Estimated Cost: $50 - $300

Cost varies based on accessibility and extent of wiring repair.

Replace Rough Road Sensor B medium
Estimated Cost: $100 - $450

Sensor cost depends on vehicle make/model; includes labor.

Update PCM/ECM software if applicable easy
Estimated Cost: $0 - $150

Some dealers may provide software updates under warranty or bulletin.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Confusing P0319 with cylinder misfire codes (e.g., P0300 series) due to misinterpreting rough road noise as engine misfire.
  • Replacing unrelated ignition components instead of checking rough road sensor circuit and ABS inputs.

Frequently Asked Questions

What does the P0319 code mean?

Technically, the P0319 code represents Rough Road Sensor B Signal Circuit Malfunction. It usually points to a fault within the Ignition.

Should I stop driving if I have P0319?

With a severity level of medium, possible erratic misfire reporting or drivability issues, may illuminate ABS/traction warnings; does not typically prevent engine operation but can affect misfire detection and performance.

Common signs of the P0319 error code

Drivers often report: Check Engine Light/MIL illuminated, ABS or traction control warning lights, Erratic misfire counts or rough running on uneven roads when this code is present.

Potential causes for OBDII code P0319

It can be caused by several factors, most notably: Faulty Rough Road Sensor B or associated circuit, Wiring harness damage or poor connector integrity, Related wheel speed sensor fault affecting rough road logic.

Estimated repair costs for different causes of P0319

Expect to pay around $150 if the issue is a Update PCM/ECM software if applicable, but up to $450 if the Replace Rough Road Sensor B needs replacement.

Is P0319 a generic or manufacturer-specific code?

Yes, P0319 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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