What does it mean?
This diagnostic code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II (VW, Ford, Audi, Buick, GM, etc.). Although generic, specific repair steps may vary by make/model.
A P0319 fault code belongs to the category of codes that includes ignition system codes. The reason is that sometimes “rough road” is actually an interpretation of sensors that have essentially detected the engine’s crankshaft moving unexpectedly.
The vehicle’s sensor system and PCM, or Powertrain Control Module, can indicate rough road conditions. For example, engine speed may be irregular when the vehicle is driven on very rough roads or off-road. This can cause the PCM to see it as an engine failure such as a misfire.
Some vehicles may have a road sensor, an accelerometer, or some may use an ABS wheel sensor and the Electronic Brake Control Module (EBCM) to help determine difficult road conditions.
Whatever the exact system used in your vehicle, if you get this fault code, it means the PCM has detected a rough road condition that requires attention. Typically, this code is only set when the readings are identical after several readings. This code refers to the electrical circuit of the Rough Road Sensor B.
Symptoms
Most fault codes trigger the check engine light (or Malfunction Indicator Lamp MIL). For this P0319 DTC, the light is not on. However, you may have other lights on (traction control, ABS, etc.) or even experience engine misfires or rough operation.
Causes
Causes
Possible reasons for setting this code are:
Faulty rough road sensor (if applicable)
Wiring/electrical fault related to sensors
Control unit needs to initialize the new road sensor
Other possible causes
Diagnostic and Repair Procedures
A good first step is to check Technical Service Bulletins (TSBs) that may apply to your year/make/model. If the problem is known, there may be a bulletin providing specific diagnostic and repair assistance for your exact issue. This can save you time and money.
You should obtain a vehicle-specific repair guide to help determine the exact type of rough road system used by your vehicle.
If you have other misfire, ABS, or related codes, you should generally fix them before proceeding with repairing a P0319. Nevertheless, save all freeze frame data, as it can be useful in any diagnostics.
If your vehicle has an accelerometer sensor, check the condition of the sensor, wiring, and connectors for any issues. Repair as needed. Then use a digital volt ohmmeter (DVOM) to check continuity, resistance, and other electrical aspects according to the manufacturer’s specifications.
If possible, use an advanced scan tool to drive the vehicle on rough roads and monitor sensor readings from the appropriate sensors on the vehicle to determine if you can replicate the problem to help pinpoint where the issue lies.