AutoCodes – GMC – P0455 2015 GMC Sierra

P0455 2015 GMC Sierra Code - Evaporative Emission System Large Leak Detected

Quick Answer

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. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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 2015 GMC Sierra indicates Evaporative Emission System Large Leak Detected.
Common causes: Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
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 Popularity 398

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 31, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0455 2015 GMC Sierra Description

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.

OBDII Code P0455 2015 GMC Sierra - Evaporative Emission System Large Leak Detected - AutoCodes.com — P0455 2015 GMC Sierra Code - Evaporative Emission System Large Leak Detected

What does this mean?

What are the Possible Causes of the DTC P0455 2015 GMC Sierra?

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 DTC P0455 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code 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)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0455 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0455 2015 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.

Frequently Asked Questions about P0455 2015 GMC Sierra Code

1. What does OBDII code P0455 mean for my 2015 GMC Sierra?

- OBDII code P0455 indicates an Evaporative Emission System Large Leak Detected in your vehicle's GMC Sierra.

2. What are common symptoms of the P0455 code in a 2015 GMC Sierra?

- Common symptoms of the P0455 code may include a strong fuel odor, the Check Engine Light being illuminated, and possible issues when refueling.

3. What are the potential causes of the P0455 code in a 2015 GMC Sierra?

- Causes of the P0455 code can include a loose or damaged gas cap, a leak in the evaporative emission system, a faulty purge valve, or a malfunctioning charcoal canister.

4. How can I diagnose the P0455 code in my 2015 GMC Sierra?

- Diagnosing the P0455 code may involve checking the gas cap for tightness, inspecting the EVAP system components for leaks, and using a smoke machine to detect the source of the large leak.

5. What are some repair tips for fixing the P0455 code in a 2015 GMC Sierra?

- Repair tips for the P0455 code may include tightening or replacing the gas cap, repairing or replacing damaged hoses in the EVAP system, testing and replacing the purge valve or charcoal canister if needed.

6. Can I still drive my 2015 GMC Sierra with the P0455 code present?

- It is generally safe to drive your GMC Sierra with the P0455 code, but it is recommended to address the issue promptly to prevent potential fuel economy loss or emissions problems.

7. How much does it cost to repair the P0455 code in a 2015 GMC Sierra?

- The cost to repair the P0455 code can vary depending on the specific cause of the issue, but it may range from around $100 for a simple fix like a gas cap replacement to several hundred dollars for more extensive repairs.

8. Will the P0455 code reset itself after repairs are made on a 2015 GMC Sierra?

- Once repairs are made to address the P0455 code in your GMC Sierra, you may need to clear the code using an OBDII scanner to reset the Check Engine Light and ensure the issue has been resolved.

9. How common is the P0455 code in a 2015 GMC Sierra?

- The P0455 code, indicating an Evaporative Emission System Large Leak Detected, is a relatively common OBDII code in vehicles like the 2015 GMC Sierra due to issues with the evaporative emission control system.

10. Can I fix the P0455 code in my 2015 GMC Sierra myself, or should I take it to a mechanic?

- Depending on your automotive repair skills and the specific cause of the P0455 code, you may be able to fix it yourself by addressing common issues like a loose gas cap. For more complex problems, it's advisable to consult a mechanic for proper diagnosis and repair.