P0455 Hyundai Code - EVAP Emission System Leak Detected Large Leak
Quick Answer
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0455 Hyundai indicates EVAP Emission System Leak Detected Large Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0455 Hyundai Description
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
What are the Possible Causes of the DTC P0455 Hyundai?
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
How to Fix the DTC P0455 Hyundai?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0455 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0455 Hyundai Code
1. What does the OBDII code P0455 for Hyundai indicate?
The code P0455 indicates that the EVAP system has detected a large leak in the emissions control system.
2. What are some common symptoms of a P0455 code on a Hyundai vehicle?
Common symptoms of a P0455 code may include the illumination of the check engine light, a strong fuel odor, decreased fuel efficiency, and potential difficulties starting the vehicle.
3. What are some possible causes of a P0455 code on a Hyundai?
Potential causes of a P0455 code include a loose or damaged gas cap, a leaking EVAP system hose, a faulty EVAP purge valve, a cracked or damaged charcoal canister, or issues with the fuel tank pressure sensor.
4. How can I diagnose the source of a large leak in the EVAP system triggering a P0455 code on my Hyundai?
To diagnose the source of the leak, you can visually inspect the EVAP system components for signs of damage or wear, check the gas cap for tightness, perform a smoke test to detect leaks, and use a scan tool to monitor EVAP system data.
5. Can I continue driving my Hyundai with a P0455 code?
While your vehicle may still be operable with a P0455 code, it is important to address the issue promptly to prevent potential damage to the emissions system and ensure compliance with environmental regulations.
6. How can I repair a P0455 code on my Hyundai?
Repairing a P0455 code may involve tightening or replacing the gas cap, repairing or replacing damaged hoses, replacing the EVAP purge valve, repairing or replacing the charcoal canister, or addressing issues with the fuel tank pressure sensor.
7. Is it possible to reset the P0455 code on a Hyundai without fixing the underlying issue?
While you can clear the code with an OBDII scanner, it is not recommended to do so without addressing the root cause of the P0455 code. The check engine light will likely return if the issue is not resolved.
8. How much does it typically cost to repair a P0455 code on a Hyundai?
The cost of repairing a P0455 code can vary depending on the specific cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or take your vehicle to a mechanic. Costs may range from a simple gas cap replacement to more extensive repairs.
9. Are there any preventive maintenance tips to avoid a P0455 code on my Hyundai?
To help prevent a P0455 code, regularly inspect your gas cap for tightness, avoid overfilling your fuel tank, perform routine maintenance on your EVAP system components, and address any issues promptly to prevent larger leaks from occurring.
10. Can a P0455 code on a Hyundai be related to other emission system faults?
Yes, a P0455 code can sometimes be related to other emission system faults, such as P0442 (Small EVAP Leak Detected) or P0440 (EVAP System Malfunction). It is important to diagnose and address all related codes to ensure proper functioning of the emissions system.
Discuss the causes and fixes for P0455 Hyundai OBDII Code
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Check engine light came on. I used hand held tool got 02 sensor stuck rich p2271 code. Replaced gas cap. Light came back on after 1 day. Took car to shop mechanic ran diagnostics found new code p0455. Evap . after 1 day check engine light back on. No drivabilty issues .he said drive it for few days se if light goes out. Then he wants to do a smoke test. Where are we going with this and whats not working in there?
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Small EVAP leaks sometimes can be difficult to diagnose. Your mechanic is correct, the next step is to use a smoke machine to detect the leak.
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Do you have a gas smell? you could have a leaking fuel hose or even a leaking fuel tank.
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Check for leaking hoses anyways and if possible have a shop with a smog machine check for EVAP system leaks.
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