INDEPENDENT REFERENCE
P0455 — EVAP system gross leak detected
Generic powertrain DTC · LOW priority for follow-up (not a certified safety rating)
What the code means
EVAP integrity test indicates a comparatively large leak or unsealed condition.
What you might notice
Illuminated check-engine light; occasional fuel odor.
Possible causes — not a diagnosis
Missing fuel cap; detached EVAP hose; stuck purge/vent valve; damaged canister.
Useful diagnostic checks
Inspect cap fit, hoses, valves and fuel odor sources safely; seek help if fuel leakage is suspected.
Next steps
Repair leaks or valve faults found by controlled tests.
Related OBD-II codes
These generic definitions are explanatory summaries of commonly standardized OBD-II powertrain conditions. Vehicle-specific code logic and service procedures must be verified against manufacturer documentation. EPA: On-board diagnostics.