What are the common causes of P04C1?

A short to ground in the fuel door unlock control circuit. A failed fuel door unlock actuator. Low battery voltage at the fuel door unlock. A faulty body control module driver.

Check the fuel door unlock control circuit for a short to ground. Measure the battery voltage at the fuel door unlock actuator. Test the fuel door unlock actuator. Replace the fuel door unlock actuator if the circuit is shorted. Clear the code and retest.

P04C1

Fuel Fill Door Unlock Control Circuit Low

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P04C1 means Fuel Fill Door Unlock Control Circuit Low.

Check these first

A short to ground in the fuel door unlock control circuit
A failed fuel door unlock actuator
Low battery voltage at the fuel door unlock
A faulty body control module driver

What to do next

Check the fuel door unlock control circuit for a short to ground
Measure the battery voltage at the fuel door unlock actuator
Test the fuel door unlock actuator
Replace the fuel door unlock actuator if the circuit is shorted
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.