Error code

OBD2 P0455

OBD2P0455
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Evaporative Emission System Leak Detected (large leak).

Severity

moderateCan drive, but should address the issue soon to prevent further emissions problems.

Summary

P0455 indicates a large leak in the evaporative emission control system (EVAP), which is designed to prevent fuel vapors from escaping into the atmosphere.

Common Causes

  • Loose or missing gas cap
  • Faulty gas cap or seal
  • Stuck EVAP purge valve or vent control valve
  • Cracked plastic parts or rubber hoses

Diagnosis

  1. Inspect and tighten gas cap properly.
  2. Check for obvious damage in EVAP system components like canister or tubing.
  3. Use jumper wires or vacuum pump to test valve functionality.
  4. Consider using a smoke machine with UV light to locate leaks.

Fixes

  • Replace faulty gas cap, purge valve, vent control valve, or damaged hoses and parts as needed.

FAQ

What should I do if my car has P0455?

Start by checking the gas cap for proper installation and condition. If that doesn't resolve it, inspect other EVAP system components like valves and hoses.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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