P04B4

2017-10-10

Description:

  • Refueling Vapor Control Valve Stuck Closed

Possible Symptoms:

  • Inspect the refueling vapor control valve for any signs of physical damage or blockage and repair or replace as necessary.

  • Check the wiring and connections to the refueling vapor control valve for any loose or damaged wires and repair or replace as needed.

  • Perform a diagnostic scan to check for any related error codes or issues in the engine control module (ECM).

  • Clean the carbon buildup or debris from the refueling vapor control valve and its surrounding components.

  • If all else fails, consider replacing the refueling vapor control valve altogether.

Possible Causes:

  • Malfunctioning or faulty Refueling Vapor Control Valve

  • Clogged or restricted fuel tank venting system

  • Damaged or leaking fuel filler neck or cap

  • Faulty fuel tank pressure sensor

  • Issues with the evaporative emission control system

Related Parts:

Possible Solutions:

  • Difficulty starting the vehicle

  • Engine misfires or runs rough

  • Decreased fuel efficiency

  • Strong smell of fuel from the exhaust

  • Check Engine Light (CEL) illuminates

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