OBD-II Code P0319 — What It Means & How to Fix It

What Does This Error Mean?

P0319 means there is a problem with the rough road sensor circuit or its signal. The rough road sensor helps the ECM tell the difference between engine misfires and bumps in the road. P0319 is similar to P0317 but typically refers to a circuit-level fault — a wiring problem rather than a sensor performance problem. The engine itself is likely fine, but the misfire detection system is compromised. This is a lower-priority code but still worth addressing.

Affected Models

All vehicles 1996+ with rough road detection
Common in GM vehicles (Chevrolet, GMC, Buick)
Common in Ford and Lincoln vehicles
Common in Chrysler, Dodge, and Jeep vehicles

Common Causes

Open or broken wire in the rough road sensor circuit
Corroded connector at the rough road sensor or at the ECM
Rough road sensor has failed and is sending no signal to the ECM
Short to ground in the sensor signal wire
ECM input circuit failure preventing it from reading the rough road sensor signal

How to Fix It

Check for any companion codes with your OBD-II scanner. ABS wheel speed sensor codes (C0035, etc.) alongside P0319 suggest the ABS sensor system is involved in the rough road detection circuit. Fix ABS codes first.

Many manufacturers use ABS wheel speed differential signals rather than a dedicated rough road sensor.
Locate the rough road sensor — consult your vehicle's service manual for its exact position. On many vehicles, it is near the front suspension or on the firewall. Unplug the connector and inspect it for corrosion, bent pins, or moisture intrusion.

The connector is often exposed to weather and is a common failure point.
Test the sensor's power and ground supply with a multimeter. Most sensors require a 5V reference signal and a clean ground to operate. If either is missing, trace the wiring back toward the ECM to find the open circuit.

No reference voltage at the sensor connector usually means a broken wire between the ECM and the sensor.
Test the signal wire from the sensor to the ECM for continuity using a multimeter in continuity mode. A broken signal wire will cause the ECM to see no input from the sensor — this matches the P0319 circuit fault description.

Wiggling the harness while testing can reveal intermittent breaks that wouldn't show up in a static test.
If the sensor, connector, and all wiring test correctly, the rough road sensor itself may have failed internally. Replace the sensor with an OEM or quality aftermarket part. Clear the code and verify it does not return after a normal drive cycle.

Rough road sensors are not expensive — typically $30-$80 for the part.

When to Call a Professional

P0319 can be difficult to diagnose without a wiring diagram and a good multimeter. A mechanic familiar with your vehicle's specific rough road detection setup will save time. If the circuit traces back correctly but the code returns, the ECM input circuit may be the problem — that requires dealer-level diagnosis. Expect $80-$150 for diagnosis and $100-$250 for typical repairs.

Frequently Asked Questions

What is a rough road sensor?

A rough road sensor measures how much vertical movement the vehicle experiences as it drives. The ECM uses this information to determine whether an engine vibration is a real misfire or just the effect of driving over a rough surface. Without it, every pothole or speed bump could trigger a false misfire code. Some vehicles use a dedicated accelerometer for this; others derive the signal from differences in wheel speed between the ABS sensors.

Can I drive with P0319?

Yes — P0319 is a sensor circuit fault, not an engine fault. Your engine is almost certainly running normally. However, with the rough road detection compromised, you may get false misfire codes on rough roads, or real misfires may not be detected correctly. It's a low-priority repair, but address it within a few weeks.

Does P0319 affect my vehicle's performance?

Not directly — P0319 is a diagnostic system fault. Your engine power, fuel economy, and drivability are not affected by this code alone. The only impact is that misfire detection accuracy is reduced while this fault is present. Think of it like a smoke detector with a dead battery — the house is fine, but the safety system is compromised.