P0319 OBD-II Trouble Code: Rough Road Sensor B Signal Circuit

check engine light

P0319 code definition

The P0319 code means that there has been a change in the vehicle’s crankshaft position.

What the P0319 code means

Many modern vehicles are designed to react differently to adverse driving conditions, rough roads being one of the most common kinds. When the PCM (powertrain control module) detects a change in crankshaft position that it attributes to a rough road or uneven driving conditions, the P0319 code will get stored. However, there could be a number of other issues behind the code being logged.

What causes the P0319 code?

The most common cause for this code being stored is just that the driver went over some rough road. However, it could also be that the automobile’s rough road sensors are defective, disconnected or even missing. Electrical connectors, wiring harnesses, and other hardware could also be damaged and, thus, causing a bad reading. Something as simple as a connector face being dirty could also trigger the code.

What are the symptoms of the P0319 code?

Usually, a Check Engine Light should come on when this code is stored, but that isn’t always the case. In some models, the sensors have to detect the problem more than once before the light will come on.

However, more serious symptoms are possible too. The vehicle’s engine may misfire or hesitate before starting up. Traction control might suffer. The same goes for the ABS (antilock brake system). These last two issues would more than likely coincide with the code being stored, though, rather than being caused by it.

How does a mechanic diagnose the P0319 code?

A qualified mechanic will need to start by using an OBD-II scanner to find all the trouble codes that have been stored. Then they’ll want to carry out a visual inspection of the rough road sensors, wiring harness, electrical connectors, and other hardware.

If none of those seem to yield any results, the mechanic will have to examine the connector faces to see if dirt, debris or corrosion is causing the problem. An ohmmeter will need to be used to test the voltage at the sensor connector and the ground signals.

Finally, if everything else seems to be operating properly, the technician will have to consider that the PCM is actually the problem. This is extremely rare, though.

Common mistakes when diagnosing the P0319 code

If a comprehensive diagnosis isn’t undertaken, the mechanic is likely to replace one of the camshaft, wheel speed, or crankshaft position sensors unnecessarily.

Another mistake is inspecting the vehicle’s physical components before using the scanner. While it may seem obvious that a sensor or wiring harness is broken, the scanner will paint a much more accurate picture. Also, once repairs are carried out, the vehicle needs to be scanned again to make sure all the problems have been properly addressed.

How serious is the P0319 code?

The code is actually pretty serious because it could mean that at least one of the vehicle’s sensors isn’t working correctly. As we mentioned earlier, if the code is stored in relation to the ABS not working, the brakes are vulnerable and the vehicle may soon become unsafe.

What repairs can fix the P0319 code?

More than likely, the rough road sensor on the vehicle will have to be replaced. The ABS and traction control system may need to be repaired. In the worst case scenario, the engine will actually need repairs too.

Additional comments for consideration regarding the P0319 code

Sometimes, diagnosing and fixing the problem behind the P0319 code is easy. Other times, it can involve inspecting thousands of circuits one at a time in order to get to the root of the problem. This is why it’s so important that even the most experienced of mechanics take their time in diagnosing the issue before diving in. Otherwise, they could potentially waste a lot of time and not have anything to show for it.

Need help with a P0319 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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