DTC P051B-84: Crankcase Pressure Sensor Circuit Range/Performance - Signal below allowable range: Action
- Refer to the appropriate System Wiring Diagram(s) and check the positive crankcase ventilation pressure sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
- Check engine crankcase ventilation system is free from leakage/blockage, components are correctly installed, not loose or that damaged pipework is allowing leakage