OBD-II code · Powertrain (generic)
P018C Fuel Pressure Sensor B Circuit Low
Fuel pressure sensor B signal voltage below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P018C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Pressure Sensor B, Sensor Wiring
Related codes
- P01C5Fuel Pressure Sensor A Circuit Low
- P0189Fuel Temperature Sensor B Circuit Intermittent
- P018AFuel Pressure Sensor B Circuit
- P018BFuel Pressure Sensor B Circuit Range/Performance
- P018DFuel Pressure Sensor B Circuit High
- P018EFuel Pressure Sensor B Circuit Intermittent/Erratic
- P018FFuel System Over Pressure Relief Valve Frequent Activation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.