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P0455 2016 GMC Sierra Code - Evaporative Emission System Large Leak Detected

Quick Answer

The P0455 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the evaporative emission control system has detected a large leak. Common causes include Loose or damaged fuel cap, Cracked or disconnected hoses in the evaporative emission system, Faulty charcoal 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 2016 GMC Sierra indicates Evaporative Emission System Large Leak Detected.
Common causes
Common causes include Loose or damaged fuel cap, Cracked or disconnected hoses in the evaporative emission system, Faulty charcoal 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 14, 2024
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Code P0455 2016 GMC Sierra Description

The P0455 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the evaporative emission control system has detected a large leak. The evaporative emission system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping 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 harmful emissions.

OBDII Code P0455 2016 GMC Sierra - Evaporative Emission System Large Leak Detected
P0455 2016 GMC Sierra Code - Evaporative Emission System Large Leak Detected

Common Causes of P0455 2016 GMC Sierra

  1. Loose or damaged fuel cap
  2. Cracked or disconnected hoses in the evaporative emission system
  3. Faulty charcoal canister
  4. Malfunctioning purge valve
  5. Leaking or damaged fuel tank

Symptoms of P0455 2016 GMC Sierra

  1. Check engine light illuminated
  2. Strong fuel odor near the vehicle
  3. Decreased fuel efficiency
  4. Rough idling or stalling
  5. Failing emissions test

How to Fix P0455 2016 GMC Sierra

  1. Inspect the fuel cap for tightness and replace if damaged or missing.
  2. Check all hoses and connections in the evaporative emission system for leaks or damage and repair or replace as needed.
  3. Test the charcoal canister and purge valve for proper operation and replace if faulty.
  4. Perform a smoke test to pinpoint the location of the large leak and repair accordingly.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0455 2016 GMC Sierra

The typical repair costs for addressing a P0455 code on a 2016 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, with hourly rates typically ranging from $80 to $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may charge less. For a more accurate estimate, it's recommended to check with local auto repair shops.

What does this mean?

Tech Notes for P0455 2016 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 2016 GMC Sierra 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.

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