P0318

Rough Road Sensor A Signal Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

False alarms for misfires
Unstable engine operation on rough roads
Check Engine Light Is On

Causes

Open or short circuit in the sensor circuit
Malfunction of the rough road sensor itself
Wiring harness damage
Corrosion of connectors
Circuit Grounding Problems

How to Fix

Check the integrity of the sensor wiring harness
Check the supply voltage and grounding of the sensor
Diagnose the sensor with a multimeter or oscilloscope
Clean connector contacts from oxidation
Replace the faulty sensor if necessary

Related codes

P0300 P0301 P0302 P0303 P0304