What are the common causes of P04C0?

A fuel door unlock actuator that does not reach its commanded position. A binding fuel door unlock mechanism. A failing fuel door unlock actuator. A faulty body control module.

Command the fuel door unlock through its range on a scan tool. Inspect the fuel door unlock mechanism for binding. Test the fuel door unlock actuator travel. Replace the fuel door unlock actuator if it does not reach position. Clear the code and retest.

P04C0

Fuel Fill Door Unlock Control Range/Performance

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

What it means

P04C0 means Fuel Fill Door Unlock Control Range/Performance.

Check these first

A fuel door unlock actuator that does not reach its commanded position
A binding fuel door unlock mechanism
A failing fuel door unlock actuator
A faulty body control module

What to do next

Command the fuel door unlock through its range on a scan tool
Inspect the fuel door unlock mechanism for binding
Test the fuel door unlock actuator travel
Replace the fuel door unlock actuator if it does not reach position
Clear the code and retest

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Updated

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