P04CD — Fuel Fill Door Open Request Sensor/Switch Stuck On

What Does P04CD Mean?

P04CD is a diagnostic trouble code indicating: Fuel Fill Door Open Request Sensor/Switch Stuck On. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P04CD

⚠️ Check Engine Light (MIL) illuminated
⚠️ Fuel Fill Door Open Request Sensor/Switch remains active when it should be off
⚠️ Related system running continuously
⚠️ Failed emissions test

Common Causes

🔍 Fuel Fill Door Open Request Sensor/Switch mechanically stuck in active position
🔍 Short circuit holding Fuel Fill Door Open Request Sensor/Switch control on
🔍 Faulty Fuel Fill Door Open Request Sensor/Switch driver circuit in ECM/PCM

Frequently Asked Questions

What does P04CD mean?

P04CD indicates: Fuel Fill Door Open Request Sensor/Switch Stuck On. The vehicle's computer has detected that the Fuel Fill Door Open Request Sensor/Switch is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P04CD?

Yes, P04CD is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P04CD?

Repair costs for P04CD typically range from $50 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Fuel Fill Door Open Request Sensor/Switch for mechanical binding or debris
🔧 Replace stuck Fuel Fill Door Open Request Sensor/Switch
🔧 Check Fuel Fill Door Open Request Sensor/Switch control circuit for short

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P04CD: Fuel Fill Door Open Request Sensor/Switch Stuck On