P0455 BMW Code - Evaporative Emission Control System Leak Detected Gross Leak
Quick Answer
The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for a large leak or restrictions to the purge path in the EVAP system. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0455 BMW indicates Evaporative Emission Control System Leak Detected Gross Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0455 BMW Description
What are the Possible Causes of the DTC P0455 BMW?
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Leaking EVAP Canister
- Leaking EVAP System Hose
- Leaking Fuel Tank
- Faulty Fuel Tank Pressure Sensor
How to Fix the DTC P0455 BMW?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0455 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0455 BMW Code
What does the OBDII code P0455 mean on a BMW?
P0455 indicates a "gross leak" in the Evaporative Emission Control (EVAP) system, meaning the system is unable to maintain proper pressure due to a large leak.
What are common symptoms of P0455 on a BMW?
Symptoms may include the check engine light turning on, a noticeable fuel smell, and in rare cases, reduced fuel efficiency.
What causes a P0455 code on a BMW?
Common causes include a loose or damaged gas cap, cracked or disconnected EVAP hoses, a faulty purge valve, or a damaged charcoal canister.
Can a loose gas cap trigger the P0455 code?
Yes, a loose, missing, or damaged gas cap is one of the most common and easiest-to-fix causes of P0455.
How do I fix the P0455 code on my BMW?
Start by checking and tightening the gas cap. If the issue persists, inspect EVAP hoses, the purge valve, and the charcoal canister for damage or leaks.
Is it safe to drive a BMW with a P0455 code?
While the car is generally safe to drive, ignoring the issue can lead to increased emissions and potential damage to other components in the EVAP system.
How is a P0455 code diagnosed on a BMW?
A mechanic will use a smoke test to find leaks in the EVAP system and may inspect components like the gas cap, purge valve, and hoses.
Can a faulty purge valve cause a P0455 code?
Yes, a stuck-open purge valve can prevent the EVAP system from holding pressure, triggering the P0455 code.
How much does it usually cost to fix the P0455 code on a BMW?
Repairs can range from $20 for a new gas cap to $200-$600 for components like the purge valve or charcoal canister, depending on the issue.
Will clearing the P0455 code fix the problem?
Clearing the code will turn off the check engine light temporarily, but the code will return if the underlying issue isn’t resolved.
Discuss the causes and fixes for P0455 BMW OBDII Code
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