OBD-II code · Powertrain (generic)
P04C5 Fuel Fill Door Lock Position Sensor Circuit Low
Same as P04C3 with the signal voltage below 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 P04C5?
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 ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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
- P04C2Fuel Fill Door Unlock Control Circuit High
- P04C3Fuel Fill Door Lock Position Sensor Circuit
- P04C4Fuel Fill Door Lock Position Sensor Circuit Range or Performance
- P04C6Fuel Fill Door Lock Position Sensor Circuit High
- P04C7Fuel Fill Door Lock Position Sensor Circuit Intermittent or Erratic
- P04C8Fuel Fill Door Open Request Sensor or Switch Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.