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P0442 2017 Chevrolet Silverado Code - Evaporative Emission System Small Leak Detected

Quick Answer

The P0442 code on a 2017 Chevrolet Silverado indicates that the evaporative emission control system has detected a small leak. Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission system, 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
P0442 2017 Chevrolet Silverado indicates Evaporative Emission System Small Leak Detected.
Common causes
Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission system, 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 17, 2024
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Code P0442 2017 Chevrolet Silverado Description

The P0442 code on a 2017 Chevrolet Silverado indicates that the evaporative emission control system has detected a small leak. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. A small leak can lead to increased emissions and decreased fuel efficiency. The code is typically triggered when the system detects a leak that is larger than normal, but still considered small.

OBDII Code P0442 2017 Chevrolet Silverado - Evaporative Emission System Small Leak Detected
P0442 2017 Chevrolet Silverado Code - Evaporative Emission System Small Leak Detected

Common Causes of P0442 2017 Chevrolet Silverado

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

Symptoms of P0442 2017 Chevrolet Silverado

  1. Check engine light illuminated
  2. Gasoline smell near the vehicle
  3. Decreased fuel efficiency
  4. Rough idle or stalling
  5. Failed emissions test

How to Fix P0442 2017 Chevrolet Silverado

  1. Inspect the gas cap for tightness and damage. Replace if necessary.
  2. Check all hoses in the evaporative emission system for cracks or disconnections. Repair or replace as needed.
  3. Test the purge valve for proper operation. Replace if faulty.
  4. Inspect the charcoal canister for cracks or damage. Replace if necessary.
  5. Perform a smoke test to locate and repair any leaks in the system.

Cost to Fix P0442 2017 Chevrolet Silverado

The typical repair costs for addressing a P0442 code on a 2017 Chevrolet Silverado can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops often charge less.

What does this mean?

Tech Notes for P0442 2017 Chevrolet Silverado

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado Code

1. What does OBDII code P0442 mean on a 2017 Chevrolet Silverado?

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

2. What are the common symptoms of a P0442 code on a 2017 Chevrolet Silverado?

Common symptoms include the check engine light coming on, a slight fuel odor near the vehicle, and potential issues with passing emissions tests.

3. What are some possible causes of a P0442 code on a 2017 Chevrolet Silverado?

Potential causes include a loose or damaged gas cap, a leak in the EVAP system hoses, a faulty purge valve, or a cracked charcoal canister.

4. How serious is a P0442 code on a 2017 Chevrolet Silverado?

While a P0442 code is not an emergency, it should be addressed promptly to prevent potential issues with emissions, fuel economy, and overall vehicle performance.

5. Can I continue driving my 2017 Chevrolet Silverado with a P0442 code?

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

6. How can I diagnose a P0442 code on my 2017 Chevrolet Silverado?

Diagnosing a P0442 code typically involves checking the gas cap for tightness, inspecting EVAP system hoses for leaks, testing the purge valve, and examining the charcoal canister for damage.

7. Can I repair a P0442 code on my 2017 Chevrolet Silverado myself?

Depending on the cause of the code, some DIY repairs may be possible, such as tightening or replacing the gas cap. However, more complex issues may require professional diagnosis and repair.

8. How much does it cost to fix a P0442 code on a 2017 Chevrolet Silverado?

The cost of fixing a P0442 code can vary depending on the specific cause of the issue. Simple fixes like replacing a gas cap may be inexpensive, while repairs involving parts replacement or system troubleshooting can be more costly.

9. Will a P0442 code reset itself on a 2017 Chevrolet Silverado?

In some cases, the P0442 code may reset itself after a few driving cycles if the issue was minor or temporary. However, it is recommended to have the code diagnosed and repaired to prevent recurring problems.

10. How can I prevent a P0442 code from recurring on my 2017 Chevrolet Silverado?

To prevent the P0442 code from coming back, make sure to always tighten the gas cap securely after refueling, perform regular maintenance on the EVAP system, and address any issues promptly to avoid leaks.

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