Engine-Codes.com
Engine-Codes – GMC – P0455 2014 GMC Sierra

P0455 2014 GMC Sierra Code - Evaporative Emission System Large Leak Detected

Quick Answer

The P0455 code in a 2014 GMC Sierra indicates that the evaporative emission control system has detected a large leak. Common causes include Loose or damaged gas cap, Cracked or disconnected EVAP hose, Faulty EVAP canister. 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 2014 GMC Sierra indicates Evaporative Emission System Large Leak Detected.
Common causes
Common causes include Loose or damaged gas cap, Cracked or disconnected EVAP hose, Faulty EVAP canister.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0455 2014 GMC Sierra Description

The P0455 code in a 2014 GMC Sierra indicates that the evaporative emission control system has detected a large leak. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. When a large leak is detected, it means that there is a significant issue with the system's ability to contain these vapors, which can lead to increased emissions and potential environmental harm.

OBDII Code P0455 2014 GMC Sierra - Evaporative Emission System Large Leak Detected
P0455 2014 GMC Sierra Code - Evaporative Emission System Large Leak Detected

Common Causes of P0455 2014 GMC Sierra

  1. Loose or damaged gas cap
  2. Cracked or disconnected EVAP hose
  3. Faulty EVAP canister
  4. Malfunctioning purge valve
  5. Leaking fuel tank filler neck

Symptoms of P0455 2014 GMC Sierra

  1. Check engine light illuminated
  2. Reduced fuel efficiency
  3. Rough idling or stalling
  4. Strong fuel odor
  5. Failed emissions test

How to Fix P0455 2014 GMC Sierra

  1. Inspect the gas cap for tightness and damage. Replace if necessary.
  2. Check EVAP hoses for cracks or disconnections. Repair or replace as needed.
  3. Test the EVAP canister and purge valve for proper operation. Replace if faulty.
  4. Inspect the fuel tank filler neck for leaks. Repair or replace if necessary.
  5. Clear the diagnostic trouble codes and perform a drive cycle to ensure the issue has been resolved.

Cost to Fix P0455 2014 GMC Sierra

The typical repair costs for addressing a P0455 code in a 2014 GMC Sierra can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also impact the overall repair costs.

What does this mean?

Tech Notes for P0455 2014 GMC Sierra

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)

Need more information about the P0455 2014 GMC Sierra code?

Need more information on how to fix the P0455 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0455 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2014 GMC Sierra Code

No Frequently Asked Questions about P0455 2014 GMC Sierra Code found.

Discuss the causes and fixes for P0455 2014 GMC Sierra OBDII Code

Submit a New Comment

Code P0455 2014 GMC Sierra comments

No comments found for this page.