P0455 Code - Evaporative Emission Control System Leak Detected Gross Leak

What Does P0455 Mean?

This indicates that a portion of the EVAP control system is no longer functioning properly. The EVAP system consists of components including (but not limited to) the gas cap, fuel lines, charcoal canister, purge valve, system pressure and flow sensors, electrical wiring and connectors, vacuum lines, the fuel tank, and fuel vapor hoses.

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What are the common causes of P0455 ?

Depending on year, make, and model, DTC P0455 may have number of causes. Here are some of the most common.

Loose or Missing Gas Cap – This is, by far, the most common cause of EVAP system leak codes, such as P0455, P0442, P0456, or P0457. Install and tighten the gas cap after every refueling.

Refueling with Engine Running – You should always shut down the engine when refueling, and not only for safety reasons. If the EVAP system leak monitor runs while the engine is idling, with the fuel cap off, it will detect a leak and set a DTC.

Faulty Gas Cap or Gas Cap Seal – If the gas cap is worn out, or the seal is cracked, it will not seal properly. Similarly, some EVAP systems are more sensitive, and a non-factory gas cap, even if it’s the right type, may not seal properly.

Stuck Valve – At least two solenoid valves open and close the EVAP system to route fuel vapors to the engine. Corrosion or debris may hold a valve open, and it will register as a leak.

Nissan / Infiniti – Vent Control Valve stuck open – Located near the charcoal canister, the valve is highly susceptible to corrosion and debris. Updated valves or an auxiliary filter kit are available for some models.

Hyundai, Mazda, Volkswagen – Purge Valve stuck open – Again, these valves are highly susceptible to corrosion and debris.

Older Vehicles – Over time, plastic and rubber tends to become more brittle and less flexible. Plastic parts and rubber hoses may crack, resulting in poor EVAP system sealing. A smoke test might be necessary to identify less-than-obvious cracks.

How do you troubleshoot P0455 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P0455 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0455.

Fortunately, P0455 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.



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