P0442 2018 Chevrolet Silverado Code - Evaporative Emission System Small Leak Detected
Quick Answer
The engine off natural vacuum test is the small leak detection diagnostic for the evaporative emission 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
- P0442 2018 Chevrolet Silverado indicates Evaporative Emission System Small 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.
Code P0442 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0442 2018 Chevrolet Silverado?
- 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 P0442 2018 Chevrolet Silverado?
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.
Code Tech Notes
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 P0442 2018 Chevrolet Silverado 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 P0442 2018 Chevrolet Silverado code?
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Frequently Asked Questions about P0442 2018 Chevrolet Silverado Code
1. What does the OBDII code P0442 mean on a 2018 Chevrolet Silverado?
P0442 indicates a small leak has been detected in the evaporative emission (EVAP) system, which controls fuel vapor emissions.
2. What are common symptoms of the P0442 code in a 2018 Silverado?
Symptoms may include the Check Engine Light turning on, a faint fuel smell near the vehicle, and potentially reduced fuel efficiency, though drivability is usually unaffected.
3. What are typical causes of the P0442 code in a 2018 Chevrolet Silverado?
Common causes include a loose or damaged gas cap, cracked or disconnected EVAP hoses, a faulty purge valve, or a leaking EVAP canister.
4. Can a loose gas cap trigger the P0442 code in my Silverado?
Yes, a loose, damaged, or improperly sealed gas cap is a frequent cause of the P0442 code.
5. How do I fix the P0442 code on my 2018 Chevrolet Silverado?
Start by inspecting and tightening the gas cap. If the code persists, check for damaged EVAP hoses, test the purge valve, and inspect the EVAP canister for leaks.
6. Is it safe to drive my 2018 Silverado with the P0442 code?
Yes, it is generally safe to drive with this code, but ignoring it can lead to increased emissions and potentially more severe EVAP system issues over time.
7. How can I diagnose the source of the P0442 code on my Silverado?
Use a smoke machine to check for leaks in the EVAP system, inspect the gas cap and hoses, and test the purge and vent valves for proper operation.
8. Will clearing the P0442 code fix the problem on my 2018 Silverado?
Clearing the code may turn off the Check Engine Light temporarily, but the issue will return unless the underlying cause is repaired.
9. How much does it cost to repair the P0442 code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the cause, ranging from $20 for a new gas cap to $150–$600 for EVAP system component replacements.
10. Can extreme weather cause the P0442 code to appear in a 2018 Silverado?
Yes, extreme heat or cold can cause EVAP system components to expand or contract, potentially leading to small leaks and triggering the code.
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