OBD-II code · Powertrain (generic)
P04C6 Fuel Fill Door Lock Position Sensor Circuit High
Same as P04C3 with the signal voltage above the plausible 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 P04C6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.4 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Fill Door Lock Position Sensor
Related codes
- P04C3Fuel Fill Door Lock Position Sensor Circuit
- P04C4Fuel Fill Door Lock Position Sensor Circuit Range or Performance
- P04C5Fuel Fill Door Lock Position Sensor Circuit Low
- P04C7Fuel Fill Door Lock Position Sensor Circuit Intermittent or Erratic
- P04C8Fuel Fill Door Open Request Sensor or Switch Circuit
- P04C9Fuel Fill Door Open Request Performance Stuck Off
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.