Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / CA
Possible causes
- Signal shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–220 €
- Estimated time: 0.4–1 h
- Component: fuel fill door request switch
Sources
References
sae:J2012