P0455 2017 GMC Sierra Code - Evaporative Emission System Large Leak Detected
Quick Answer
The P0455 code on a 2017 GMC Sierra signifies that the evaporative emission system has detected a large leak. Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap can prevent the system from sealing properly, leading to a large leak, Cracked or Broken Evaporative Emission System Components: Any cracks or breaks in the hoses, valves, or canister of the system can cause a large leak, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine, and if it malfunctions, it can result in a large leak. 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 2017 GMC Sierra indicates Evaporative Emission System Large Leak Detected.
- Common causes
- Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap can prevent the system from sealing properly, leading to a large leak, Cracked or Broken Evaporative Emission System Components: Any cracks or breaks in the hoses, valves, or canister of the system can cause a large leak, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine, and if it malfunctions, it can result in a large leak.
- 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.
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Code P0455 2017 GMC Sierra Description
The P0455 code on a 2017 GMC Sierra signifies that the evaporative emission system has detected a large leak. This system is responsible for controlling the release of fuel vapors from the fuel tank into the engine to be burned. A large leak can lead to increased emissions, reduced fuel efficiency, and potential damage to other components of the vehicle. The evaporative emission system helps to prevent these harmful vapors from being released into the environment.
Common Causes of P0455 2017 GMC Sierra
- Loose or Damaged Gas Cap: A loose or damaged gas cap can prevent the system from sealing properly, leading to a large leak.
- Cracked or Broken Evaporative Emission System Components: Any cracks or breaks in the hoses, valves, or canister of the system can cause a large leak.
- Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine, and if it malfunctions, it can result in a large leak.
- Leaking Fuel Tank: A leaking fuel tank can also contribute to a large leak in the evaporative emission system.
Symptoms of P0455 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Fuel Smell: A noticeable fuel smell inside or outside the vehicle can indicate a large leak in the evaporative emission system.
- Decreased Fuel Efficiency: A large leak can cause the engine to burn more fuel than necessary, leading to decreased fuel efficiency.
- Rough Idle: The engine may experience rough idling or hesitation during acceleration due to the improper release of fuel vapors.
How to Fix P0455 2017 GMC Sierra
- Inspect Gas Cap: Check the gas cap for any signs of damage or looseness. Replace the gas cap if necessary.
- Check Evaporative Emission System Components: Inspect the hoses, valves, and canister for any cracks or breaks. Replace any damaged components.
- Test Purge Valve: Test the purge valve to ensure it is functioning correctly. Replace the valve if it is faulty.
- Check Fuel Tank: Inspect the fuel tank for any leaks or damage. Repair or replace the fuel tank as needed.
- Clear Code: After making the necessary repairs, clear the diagnostic trouble code using an OBD-II scanner to reset the check engine light.
Cost to Fix P0455 2017 GMC Sierra
The typical repair costs for addressing a P0455 code on a 2017 GMC Sierra can range from $100 to $500, depending on the specific cause of the issue and the cost of replacement parts. Labor costs can vary, but the average hourly rate at most auto repair shops falls between $80 and $150. Keep in mind that rates may differ based on location, the vehicle's make and model, and the type of engine. It's recommended to obtain quotes from local shops for a more accurate estimate.
Tech Notes for P0455 2017 GMC Sierra
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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Frequently Asked Questions about P0455 2017 GMC Sierra Code
What does the OBDII code P0455 mean on a 2017 GMC Sierra?
P0455 indicates a "Large Leak Detected" in the evaporative emission (EVAP) system, which prevents fuel vapors from escaping into the atmosphere.
What are common symptoms of code P0455 on a GMC Sierra?
Symptoms may include the check engine light turning on, a noticeable fuel odor, and possibly reduced fuel efficiency.
What causes the P0455 code on a 2017 GMC Sierra?
Common causes include a loose or damaged gas cap, cracked or disconnected EVAP hoses, a faulty purge valve, or a leak in the EVAP canister.
Can a loose gas cap trigger code P0455 on a GMC Sierra?
Yes, a loose, damaged, or missing gas cap is one of the most common causes of the P0455 code.
How can I troubleshoot the P0455 code on my GMC Sierra?
Start by checking the gas cap for tightness or damage. Then inspect EVAP system components like hoses, the purge valve, and the canister for visible leaks or cracks.
Is it safe to drive a 2017 GMC Sierra with the P0455 code?
While the vehicle is generally safe to drive, ignoring the issue can lead to reduced fuel efficiency and environmental harm due to fuel vapor leaks.
How do I fix the P0455 code on a GMC Sierra?
Repairs may include tightening or replacing the gas cap, repairing or replacing damaged EVAP hoses, or replacing a faulty purge valve or canister.
How much does it cost to repair the P0455 code on a GMC Sierra?
Costs vary but can range from $20 for a new gas cap to $200–$600 for parts and labor if other EVAP components need replacement.
Can extreme weather cause the P0455 code to appear?
Yes, extreme heat or cold can cause EVAP system components to expand, contract, or crack, potentially triggering the P0455 code.
Will clearing the P0455 code with a scanner fix the problem?
Clearing the code will turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.
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