WRENCHIFY
Quick decodeBack to home
All codes/P04B7

P04B7

Fuel Fill Door Position Sensor Circuit Intermittent or Erratic

Moderate severity

The position sensor or switch on the fuel fill door reports an intermittent signal - opens and closes randomly without matching the actual door position. Typically a connector or chafed harness fault.

The position sensor or switch on the fuel fill door reports an intermittent signal - opens and closes randomly without matching the actual door position. Typically a connector or chafed harness fault.

Common causes

  • Intermittent contact at connector

    One of the most commonly reported causes for this code — check this first.

    high

    Typical part cost: $70-280

  • Connector with intermittent contact under vibration

    Less common, but worth ruling out after the more likely causes.

    low

    Typical part cost: $70-280

  • See all causes + fix costs

    Create a free Wrenchify account to unlock the rest for P04B7.

    Unlock causes

    Free forever · No credit card

First things to check

  1. 1Confirm the code with a scan tool and check for additional related codes.
  2. 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

Get the full step-by-step diagnosis

Create a free Wrenchify account to unlock the rest for P04B7.

Unlock diagnosis

Free forever · No credit card

Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

View on Amazon
Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

View on Amazon
Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

View on Amazon

Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

As an Amazon Associate, Wrenchify earns from qualifying purchases. This supports the app at no extra cost to you.

Related codes

See related trouble codes

Create a free Wrenchify account to unlock the rest for P04B7.

Unlock related codes

Free forever · No credit card

Frequently asked questions

What does P04B7 mean?

P04B7 means "Fuel Fill Door Position Sensor Circuit Intermittent or Erratic". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P04B7?

intermittent contact at connector; connector with intermittent contact under vibration; harness routed against vibrating component — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

Get the full P04B7 diagnosis for your vehicle

Year, make, model + step-by-step repair help — free plan included.

Diagnose P04B7