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P0442 2016 GMC Sierra Code - Evaporative Emission System Small Leak Detected

Quick Answer

The P0442 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a small leak detected in the evaporative emission control system. Common causes include Loose or damaged fuel cap, Cracked or disconnected hoses in the evaporative emission system, Malfunctioning 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
P0442 2016 GMC Sierra indicates Evaporative Emission System Small Leak Detected.
Common causes
Common causes include Loose or damaged fuel cap, Cracked or disconnected hoses in the evaporative emission system, Malfunctioning 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 12, 2024
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Code P0442 2016 GMC Sierra Description

The P0442 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a small leak detected in the evaporative emission control system. The evaporative emission system is responsible for capturing and storing fuel vapors that would otherwise escape into the atmosphere. This system plays a crucial role in reducing harmful emissions from the vehicle.

OBDII Code P0442 2016 GMC Sierra - Evaporative Emission System Small Leak Detected
P0442 2016 GMC Sierra Code - Evaporative Emission System Small Leak Detected

Common Causes of P0442 2016 GMC Sierra

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

Symptoms of P0442 2016 GMC Sierra

  1. Check engine light illuminated
  2. Fuel odor inside or outside the vehicle
  3. Decreased fuel efficiency
  4. Failed emissions test
  5. Hissing or hissing noise coming from the fuel tank area

How to Fix P0442 2016 GMC Sierra

  1. Inspect the fuel cap and ensure it is properly tightened or replace it if damaged.
  2. Check all hoses in the evaporative emission system for cracks or disconnections and repair or replace as necessary.
  3. Test the purge valve and replace if faulty.
  4. Inspect the charcoal canister for damage or malfunctions and replace if needed.
  5. Check the fuel tank pressure sensor for any issues and replace if necessary.

Cost to Fix P0442 2016 GMC Sierra

The typical repair costs for addressing a P0442 code in a 2016 GMC Sierra can vary depending on the specific cause of the small leak. On average, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $200. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also impact repair costs.

What does this mean?

Tech Notes for P0442 2016 GMC Sierra

The P0442 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 P0442 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 P0442 2016 GMC Sierra code?

Need more information on how to fix the P0442 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P0442 2016 GMC Sierra Code

1. What does OBDII code P0442 for a 2016 GMC Sierra mean?

Code P0442 indicates that the Evaporative Emission System has detected a small leak.

2. What are the common symptoms of a P0442 code in a 2016 GMC Sierra?

Common symptoms include the illumination of the check engine light, a gasoline odor near the vehicle, and potential issues passing emissions tests.

3. What are the possible causes of a P0442 trouble code in a 2016 GMC Sierra?

Common causes include a loose or damaged gas cap, a cracked or loose vapor hose, a malfunctioning purge solenoid, or a leak in the EVAP system.

4. How serious is a P0442 code in a 2016 GMC Sierra?

While a P0442 code is not typically an urgent issue, it should be addressed promptly to prevent potential damage to the emission control system and ensure proper vehicle performance.

5. Can I continue driving my 2016 GMC Sierra with a P0442 code?

It is generally safe to drive your vehicle with a P0442 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to avoid further problems.

6. How can I diagnose a P0442 code in my 2016 GMC Sierra?

Diagnosis typically involves checking the gas cap for tightness, inspecting the EVAP system components for damage or leaks, and using a scan tool to monitor system operation.

7. How can I repair a P0442 code in my 2016 GMC Sierra?

Common repairs include tightening or replacing the gas cap, repairing or replacing damaged hoses, fixing leaks in the system, or replacing faulty components like the purge solenoid.

8. Can a P0442 code affect fuel efficiency in a 2016 GMC Sierra?

Yes, a P0442 code can potentially impact fuel efficiency as it may cause the vehicle to run less efficiently due to issues with the evaporative emission control system.

9. Will a P0442 code cause any harm to my 2016 GMC Sierra if left untreated?

While leaving a P0442 code untreated may not cause immediate harm to the vehicle, it can lead to increased emissions, potential damage to the catalytic converter, and a failed emissions test.

10. How much can I expect to pay to fix a P0442 code in my 2016 GMC Sierra?

The cost of repairing a P0442 code can vary depending on the exact cause of the issue, but it typically ranges from $100 to $500, including parts and labor.

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