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MERCEDES-BENZ Code P0455: Meaning, Causes, and Symptoms | EN - DonosHome - OBD2 scanner,Battery tester,tuning,Car Ambient Lighting

MERCEDES-BENZ Code P0455: Meaning, Causes, and Symptoms | EN

P0455 – Identifying Large Evaporative Emission System Leaks

If your Mercedes-Benz is showing the P0455 code, it signals a significant Evaporative Emission System (EVAP) leak. This can trigger the Engine Light or Service Engine Soon Warning Light, accompanied by a noticeable fuel odor from released fuel vapors.

Symptoms:

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Noticeable fuel odor from fuel vapors

Possible Causes:

  • Missing or loose fuel cap
  • Incorrect fuel filler cap used
  • Open or malfunctioning fuel filler cap
  • Foreign matter in the fuel filler cap
  • EVAP canister or fuel tank leaks
  • Leaking EVAP system hose
  • Fuel tank leakage

Description:

The diagnostic process involves detecting EVAP purge line leaks using engine intake manifold vacuum. The Engine Control Module (ECM) checks for leaks between the fuel tank and the EVAP canister purge volume control solenoid valve under specific vacuum conditions. The vacuum cut valve bypass valve clears the line, and the EVAP canister vent control valve is closed to shut off the EVAP purge line. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After depressurization, the EVAP canister purge volume control solenoid valve closes.

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