AutoCodes – Acura – P0455 Acura

P0455 Acura Code - EVAP System Large Leak Detected

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 Acura indicates EVAP System Large Leak Detected.
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.

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Code Popularity 32,785

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0455 Acura Description

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
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.

OBDII Code P0455 Acura - EVAP System Large Leak Detected - AutoCodes.com — P0455 Acura Code - EVAP System Large Leak Detected

What does this mean?

What are the Possible Causes of the DTC P0455 Acura?

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 Acura?

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.

What does this mean?

Code Tech Notes

The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0455 Acura 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.

Need more information about the P0455 Acura code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0455 Acura Code

1. What does the OBDII code P0455 mean on an Acura?

P0455 indicates a large leak in the EVAP (Evaporative Emission Control) system, which is responsible for trapping fuel vapors and preventing them from escaping into the atmosphere.

2. What are the common symptoms of the P0455 code in an Acura?

Symptoms may include the check engine light turning on, a noticeable fuel smell, and potentially a slight decrease in fuel efficiency.

3. What causes the P0455 code on an Acura?

Common causes include a loose or damaged gas cap, a cracked or disconnected EVAP hose, a faulty purge valve, or a malfunctioning EVAP canister.

4. Can a loose gas cap trigger the P0455 code in an Acura?

Yes, a loose, damaged, or missing gas cap is one of the most common reasons for the P0455 code.

5. How can I fix the P0455 code on my Acura?

Start by tightening or replacing the gas cap. If the code persists, inspect the EVAP system for leaks, damaged hoses, or faulty components like the purge valve or canister.

6. Is it safe to drive an Acura with the P0455 code?

Yes, it's generally safe to drive, but ignoring the issue can lead to increased emissions and potentially affect other components over time.

7. How do mechanics diagnose the P0455 code on an Acura?

Mechanics use a smoke test to detect leaks in the EVAP system, inspect hoses and connections, and check the gas cap and related components.

8. Can extreme weather cause the P0455 code in an Acura?

Yes, extreme heat or cold can sometimes cause plastic or rubber components in the EVAP system to crack or fail, leading to leaks.

9. Will clearing the P0455 code solve the issue on my Acura?

Clearing the code may turn off the check engine light temporarily, but the issue will return if the underlying problem isnâ€™t fixed.

10. How much does it cost to repair the P0455 code on an Acura?

Costs vary depending on the cause. Replacing a gas cap is inexpensive, around $20, while repairing leaks or replacing EVAP components can range from $100 to $500 or more.