OBD-II code · Powertrain (generic)
P04CA Fuel Fill Door Open Request Sensor or Switch Circuit Low
Same as P04C8 with the signal voltage shorted to ground or constantly low. 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 P04CA?
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
- 0.4–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Fill Door Request Switch
Related codes
- 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
- P04CBFuel Fill Door Open Request Sensor or Switch Circuit High
- P04CCFuel Fill Door Open Request Sensor or Switch Circuit Intermittent or Erratic
- P04CDFuel Fill Door Open Request Sensor or Switch Stuck On
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.