P0319 - Rough Road Sensor Signal Out of Range
Last updated:
System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0319 indicates that the Engine Control Module (ECM) has detected an irrational signal from the Rough Road Sensor. This sensor (or data derived from ABS wheel speed sensors) is used to detect vertical vibrations caused by uneven road surfaces. This data is critical for the Misfire Monitor logic; if the road is rough, the ECM may suspend misfire detection to avoid false positives caused by driveline oscillations. A fault in this signal compromises the OBD-II misfire detection strategy.
Possible Causes
Faulty or dirty wheel speed sensor (ABS sensor)
Damaged wiring harness or corrosion in connector for ABS/accelerometer
Damaged tone ring (reluctor ring) on CV axle or wheel bearing
Faulty ABS module or Engine Control Module (PCM/ECU)
Symptoms
Recommended Solution
- Perform a visual inspection of wheel speed sensors and tone rings at all four wheels. Clean if necessary.
- Inspect wiring for fraying or damage, especially near suspension components.
- Measure resistance (Ohm) of ABS sensors. Typical values are 1000-1600 Ohms (consult OEM specs for exact values).
- Use a scan tool to monitor Live Data for wheel speed and G-sensors during a test drive. Signals should be consistent and linear.
- Check for related ABS/ESC fault codes that may trigger P0319 as a secondary fault.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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