P0319

Code

Generic P — Powertrain

Rough Road Sensor B Signal Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 43 RU: 37

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Read DTCs and freeze frame/live data with a scan tool; note conditions when code set
Visually inspect sensor B and wiring harness for damage, pin corrosion, loose connector
Backprobe sensor connector to check reference voltage, ground and signal with key on
Wiggle test wiring while monitoring live signal for intermittent changes
Measure continuity and resistance of the harness between sensor and module (pin-to-pin)
Check for shorts to battery and ground using a multimeter

Sensor supply: typically a 5 V reference (may vary by manufacturer)
Signal output: analog voltage with DC offset (nominal ~2.5 V at rest, varies with movement)
Expected dynamic response: AC component riding on DC offset, frequency content typically in the low 1–200 Hz range
Resistance/impedance: sensor may read as a specific resistance when cold/at rest (check vehicle spec)
Fault conditions: open circuit (no signal), short to ground (0 V), short to battery (near supply voltage), or noisy/erratic waveform

Verify code P0319 and any related codes. Record freeze frame and live-data conditions (speed, engine on/off, road surface).
Perform a visual inspection of sensor B, mounting, and harness for damage, corrosion, water intrusion or recent repairs.
Backprobe connector with key on (engine off unless specified). Verify sensor reference voltage, ground continuity and resting signal voltage. Compare to manufacturer values or sensor A if available.
Check continuity from sensor connector pins to the control module connector pins. Repair any open circuits or high-resistance connections.
Check for shorts: with harness disconnected, measure resistance to ground and battery voltage on the signal pin. Repair any shorts.
With an oscilloscope or high-speed multimeter, monitor the signal while inducing vibration (tap sensor or drive over rough surface). Confirm expected waveform and response. Note intermittent dropouts or noisy output.
If wiring and connectors are good but signal out of range, replace the Rough Road Sensor B and retest.
If new sensor still faults and wiring verified, suspect the control module input. Check module grounds/power and reflash/update software if a service bulletin exists before replacing module.
Clear codes, perform road test under same conditions, and verify code does not return. Document repair and recheck after a short drive cycle.