Skip to content
Book on WhatsApp

P04DC

Fuel Fill Door Position Sensor Circuit Range or Performance

Same as P04B8 with the signal in plausible range yet not matching the actuator command - door reports closed when motor commanded open, or vice versa.

  • Check engine light: Not always
  • Emissions related: No
  • Repair difficulty: easy

Common causes

Ordered by how often each turns out to be the cause.

  • Sensor signal offset against actual positionCommon

Parts involved

  • Fuel Fill Door Position Sensor

P04DC is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.