Engine-Codes - Chevrolet - P0455 CHEVROLET

P0455 CHEVROLET Code - Evaporative Emission Control System Leak Detected Gross Leak

- Code Popularity: 351,766 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0455 CHEVROLET Code?

  • 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 P0455 CHEVROLET Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0455 CHEVROLET 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 tightening the gas cap and clearing the code. In most cases, the code can be clear by disconnecting the car battery for about 30 minutes.





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|What is the cost to diagnose the P0455 CHEVROLET code?

Labor: 1.0

The cost to diagnose the P0455 CHEVROLET code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0455 CHEVROLET code detected?

EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

|What are P0455 CHEVROLET code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

|What Does the P0455 CHEVROLET Code Mean?

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.
Evaporative Emission Control System Leak Detected Gross Leak

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