Rough Road Sensor B Signal Circuit
P0319 indicates the PCM has detected a malfunction in the Rough Road Sensor B signal circuit. This sensor helps the vehicle distinguish between engine misfires and rough road conditions by monitoring vibration. The code sets when the PCM cannot properly receive or interpret the sensor's signal.
What You Might Notice
- Check Engine Light may not illuminate, but other warning lights (ABS, traction control) may be active
- Engine misfires or rough running sensation
- Traction control or stability control warning lights illuminated
- Vehicle may limp mode or reduced performance
- Potential false misfire detection by the engine control module
Most Common Causes
- 1
Rough Road Sensor B wiring issue
Open, shorted, or corroded wiring in the Rough Road Sensor B circuit. Check connectors and harnesses for damage, corrosion, or loose connections.
- 2
Faulty Rough Road Sensor B
The sensor itself has failed or is producing out-of-range signals. This sensor may be an accelerometer, dedicated vibration sensor, or derived from ABS wheel speed sensors depending on the vehicle.
- 3
Electronic Brake Control Module (EBCM) malfunction
The EBCM or related control module responsible for processing rough road sensor data may have failed or lost communication with the PCM.
- 4
PCM software issue or internal fault
The Powertrain Control Module may require a software update or may have an internal processing error affecting sensor signal interpretation.
How to Diagnose It
- 1
Check Rough Road Sensor B wiring issue — Open, shorted, or corroded wiring in the Rough Road Sensor B circuit. Check connectors and harnesses for damage, corrosion, or loose connections.
- 2
Check Faulty Rough Road Sensor B — The sensor itself has failed or is producing out-of-range signals. This sensor may be an accelerometer, dedicated vibration sensor, or derived from ABS wheel speed sensors depending on the vehicle.
- 3
Check Electronic Brake Control Module (EBCM) malfunction — The EBCM or related control module responsible for processing rough road sensor data may have failed or lost communication with the PCM.
- 4
Check PCM software issue or internal fault — The Powertrain Control Module may require a software update or may have an internal processing error affecting sensor signal interpretation.
How to Fix It
- 1
Inspect and repair wiring harness
Visually inspect all wiring and connectors related to the Rough Road Sensor B circuit for corrosion, damage, or loose connections. Repair or replace damaged wiring as needed.
- 2
Replace Rough Road Sensor B
If wiring is intact, replace the faulty Rough Road Sensor B. Depending on your vehicle, this may be a dedicated vibration sensor, accelerometer, or ABS wheel speed sensor.
- 3
Check EBCM and module communication
Verify that the Electronic Brake Control Module is functioning and communicating properly with the PCM. Use diagnostic equipment to test EBCM output and CAN bus communication.
- 4
Update PCM software or replace module
Contact your vehicle manufacturer for available PCM software updates. If no update resolves the issue, the PCM may require replacement.
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