Engine-Codes - Chevrolet - P0455 Chevrolet

P0455 Chevrolet Code - Evaporative Emission System Large Leak Detected

- Code Popularity: 370,190 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 3/3
Table of contents

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

  • 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
  • Leaking EVAP Canister
  • Leaking EVAP System Hose
  • Leaking Fuel Tank
  • Faulty Fuel Tank Pressure Sensor

|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.

|Code P0455 Chevrolet Tech Notes

The P0455 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that will trigger the P0455 code.

There is a factory service bulletin for all the models from 2000 through 2021. The factory states that there are seven critical connections that could likely lead to this DTC being set:
1. Purge tube to purge valve (at intake manifold)
2. Purge tube to chassis EVAP line (at the rear of the engine, near transmission)
3. Chassis EVAP line to canister (at canister)
4. Fuel tank load line to canister (at canister)
5. Vent valve line to vent valve (at vent valve)
6. Fuel tank load line jumper connection (near fuel tank)
7. Fuel tank cap is closed properly (at refuel compartment)





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|What is the Cost to Diagnose the Code P0455 Chevrolet?

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.

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|What are Code P0455 Chevrolet 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?

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for a large leak or restrictions to the purge path in the EVAP system. When the enabling criteria has been met, the ECM commands the EVAP vent solenoid valve and purges the solenoid valve ON, allowing vacuum into the EVAP system. The ECM monitors the fuel tank pressure sensor voltage to verify that the system is able to reach a calibrated level of vacuum before a calibrated amount of purge volume has passed through the system. The Diagnostic Trouble Code (DTC) will be set when the EVAP system is not able to achieve or maintain a calibrated level of vacuum less than -2.74 kPa (-11 in H20) before a calibrated amount of purge volume has passed through the system.
P0455 Chevrolet Code - Evaporative Emission System Large Leak Detected

|Need more Information on the P0455 Chevrolet Code?

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|Need Help with the P0455 Chevrolet Code?

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