What Does P0319 Mean?
There is a malfunction in the Rough Road Sensor B signal circuit. This secondary sensor works in conjunction with Sensor A to provide the PCM with accurate road surface condition data for misfire detection filtering. The failure of this circuit reduces the accuracy of the rough road compensation algorithm and may cause false misfire codes.
Common Causes
30%
Open or shorted wiring in the Sensor B circuit between the sensor and the PCM
25%
Failed rough road sensor B producing no signal or out-of-range output
20%
Corroded or damaged connector at the sensor or PCM end of the circuit
15%
Rear wheel speed sensor fault if rough road B data is derived from ABS inputs
10%
Water intrusion or physical damage to the sensor from road debris
Diagnostic Steps
1
Monitor the Rough Road Sensor B PID with the scan tool while driving over varying road surfaces — compare its response pattern to Sensor A to verify both are functioning.
2
Perform a visual inspection of the Sensor B wiring harness, following it from the sensor location (often rear axle area) to the PCM, looking for damage from road debris, heat, or abrasion.
3
Use a DVOM to check for continuity in the signal and ground wires from the sensor connector to the PCM connector. Repair any open circuits found.
4
Check the sensor's reference voltage (typically 5V) and ground at the connector with key on, engine off. Both should be within 0.1V of specification.
5
If the system derives rough road data from ABS wheel speed sensors, swap the rear left and right wheel speed sensor connectors to see if the fault follows the sensor or stays with the circuit.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
There is a malfunction in the Rough Road Sensor B signal circuit. This secondary sensor works in conjunction with Sensor A to provide the PCM with accurate road surface condition data for misfire detection filtering. The failure of this circuit reduces the accuracy of the rough road compensation alg...
The most common cause of P0319 (Rough Road Sensor B Signal Circuit) is: Open or shorted wiring in the Sensor B circuit between the sensor and the PCM
Typical repair costs for P0319 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. This code does not affect engine power or driveability. The main consequence is potential for false misfire DTCs on rough roads. Schedule a repair at your convenience to maintain proper misfire detection accuracy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0319 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Engine Management / Misfire Detection
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
