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P0455 2016 Chevrolet Silverado Code - Evaporative Emission System Large Leak Detected

Quick Answer

The P0455 code for a 2016 Chevrolet Silverado indicates that the evaporative emission system has detected a large leak. Common causes include Loose or damaged gas cap, Cracked or damaged fuel tank, Faulty purge valve. 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 Chevrolet Silverado indicates Evaporative Emission System Large Leak Detected.
Common causes
Common causes include Loose or damaged gas cap, Cracked or damaged fuel tank, Faulty purge valve.
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 11, 2024
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Code P0455 2016 Chevrolet Silverado Description

The P0455 code for a 2016 Chevrolet Silverado indicates that the evaporative emission system has detected a large leak. This 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 Chevrolet Silverado - Evaporative Emission System Large Leak Detected
P0455 2016 Chevrolet Silverado Code - Evaporative Emission System Large Leak Detected

Common Causes of P0455 2016 Chevrolet Silverado

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

Symptoms of P0455 2016 Chevrolet Silverado

  1. Check engine light illuminated on the dashboard
  2. Rough engine idle or stalling
  3. Reduced fuel efficiency
  4. Strong fuel odor near the vehicle
  5. Difficulty starting the engine

How to Fix P0455 2016 Chevrolet Silverado

  1. Begin by inspecting the gas cap for any signs of damage or wear. Ensure that it is properly tightened and seals securely.
  2. Check the fuel tank for any cracks or leaks. Repair or replace the tank if necessary.
  3. Test the purge valve for proper operation. Replace it if it is faulty.
  4. Inspect the vapor canister for any damage or leaks. Replace it if needed.
  5. Check all hoses in the evaporative emission system for leaks or disconnections. Repair or replace any damaged hoses.

Cost to Fix P0455 2016 Chevrolet Silverado

The cost of repairing a P0455 code on a 2016 Chevrolet Silverado can vary depending on the specific cause of the large leak. In general, the parts required for this repair, such as a new gas cap, fuel tank, purge valve, vapor canister, or hoses, can range from $100 to $500. Labor costs at an auto repair shop typically range from $80 to $150 per hour, and the total cost of the repair can amount to $200 to $800 or more, depending on the extent of the issue and the shop's rates. It is recommended to consult with a qualified mechanic to obtain a more accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for P0455 2016 Chevrolet Silverado

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 Chevrolet Silverado code?

Need more information on how to fix the P0455 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2016 Chevrolet Silverado Code

1. What does the OBDII code P0455 mean on a 2016 Chevrolet Silverado?

P0455 indicates a "Large Leak Detected" in the Evaporative Emission (EVAP) system, which traps fuel vapors to prevent them from escaping into the atmosphere.

2. What are the common symptoms of code P0455 on a 2016 Chevrolet Silverado?

Symptoms include the Check Engine Light turning on, a faint fuel smell near the vehicle, and potentially decreased fuel efficiency, though drivability is generally unaffected.

3. What causes the P0455 code to trigger on a 2016 Chevrolet Silverado?

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

4. Can a loose gas cap cause the P0455 code?

Yes, a loose or improperly sealed gas cap is one of the most common reasons for this code and should be checked first.

5. How do I diagnose the P0455 code on my 2016 Chevrolet Silverado?

Start by inspecting the gas cap for proper tightness and damage. Then, visually check EVAP hoses and components for cracks or disconnections. Advanced diagnostics may require a smoke test to locate leaks.

6. Is it safe to drive my 2016 Chevrolet Silverado with a P0455 code?

Yes, it is generally safe to drive, as this code doesn’t affect engine performance. However, it should be addressed promptly to prevent emissions issues and potential long-term damage.

7. How can I fix the P0455 code on my 2016 Chevrolet Silverado?

Common fixes include tightening or replacing the gas cap, repairing or replacing damaged EVAP hoses, or replacing faulty components like the purge valve or charcoal canister.

8. How much does it cost to repair the P0455 code on a 2016 Chevrolet Silverado?

The cost varies depending on the issue. A new gas cap costs around $20, while repairs for hoses or EVAP components can range from $100 to $600, including labor.

9. Can extreme weather cause the P0455 code to appear on my 2016 Chevrolet Silverado?

Yes, extreme temperatures can cause EVAP hoses to crack or seals to fail, potentially triggering this code.

10. Will clearing the P0455 code with a scanner fix the problem on my 2016 Chevrolet Silverado?

Clearing the code will reset the Check Engine Light temporarily, but the underlying issue must be fixed to prevent the code from returning.

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