BMW DTC P0455 – EVAP System Leak Detected (large leak)
DTC P0455 meaning on BMW
The DTC P0455 on a BMW indicates that the engine control module (ECM) has detected a large leak in the evaporative emission control system (EVAP). The EVAP system is designed to prevent fuel vapors from escaping into the atmosphere, and a large leak can lead to increased emissions and decreased fuel efficiency.
BMW DTC P0455 symptoms
Symptoms of a DTC P0455 on a BMW may include:
- Check Engine Light illuminated
- Strong fuel odor near the vehicle
- Decreased fuel efficiency
- Hissing or hissing noise from the fuel tank area
BMW DTC P0455 causes
Common causes of a DTC P0455 on a BMW include:
- Loose or damaged gas cap
- Cracked or disconnected EVAP system hoses
- Leaking EVAP system components such as the purge valve or charcoal canister
- Fuel filler neck issues
BMW DTC P0455 seriousness
While a DTC P0455 may not cause immediate drivability issues, it can lead to increased emissions and decreased fuel efficiency. Ignoring the issue can also potentially cause damage to other emissions control components over time.
How to diagnose DTC P0455 on BMW
To diagnose a DTC P0455 on a BMW, a mechanic may perform the following steps:
- Inspect the gas cap for proper sealing
- Check EVAP system hoses for cracks or disconnections
- Use a smoke machine to detect leaks in the EVAP system
- Test the EVAP system components for proper operation
How to fix DTC P0455 on BMW
To fix a DTC P0455 on a BMW, the following steps may be taken:
- Ensure the gas cap is tightened properly or replace if damaged
- Repair or replace any cracked or disconnected EVAP system hoses
- Replace any faulty EVAP system components such as the purge valve or charcoal canister
- Address any issues with the fuel filler neck
How to erase DTC P0455 on BMW
After the underlying issue causing the DTC P0455 on a BMW has been fixed, the code can be erased using an OBD-II scanner. The scanner can clear the code from the ECM’s memory, and the Check Engine Light should turn off once the code is successfully cleared.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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