P0442 Code: Meaning, Symptoms, Causes & Fixes
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Causes ranked by likelihood
| Cause | Likelihood | DIY difficulty |
|---|---|---|
| Worn gas cap O-ring — Cheapest first fix. | Most likely | 2/5 |
| Tiny EVAP hose crack — Often requires smoke test to locate. | Possible | 2/5 |
| Leaking purge or vent valve — Valve seals fail with age. | Less likely | 2/5 |
Symptoms of P0442
- CEL only
How to diagnose P0442
- Confirm the code. Read P0442 with an OBD-II scanner and note the freeze-frame data (speed, temperature, load) recorded when it set.
- Check for companion codes. Look for other stored or pending codes such as P0455, P0440, P0456 — they often point to one shared root cause.
- Check: Worn gas cap O-ring. Cheapest first fix.
- Check: Tiny EVAP hose crack. Often requires smoke test to locate.
- Check: Leaking purge or vent valve. Valve seals fail with age.
- Clear and verify. After the repair, clear the code and complete a full drive cycle to confirm P0442 does not return.
Can I drive with P0442?
Yes.
Related codes
P0442 by vehicle
- P0442 on the Ford F-150
- P0442 on the Ford Escape
- P0442 on the Ford Explorer
- P0442 on the Ford Focus
- P0442 on the Ford Mustang
- P0442 on the Chevrolet Silverado
- P0442 on the Chevrolet Equinox
- P0442 on the Chevrolet Malibu
- P0442 on the Chevrolet Tahoe
- P0442 on the Chevrolet Traverse
- P0442 on the Chevrolet Cruze
- P0442 on the Toyota Camry
- P0442 on the Toyota Corolla
- P0442 on the Toyota RAV4
- P0442 on the Toyota Highlander
- P0442 on the Toyota Tacoma
- P0442 on the Toyota Prius
- P0442 on the Honda Civic
- P0442 on the Honda Accord
- P0442 on the Honda CR-V
- P0442 on the Honda Pilot
- P0442 on the Honda Odyssey
- P0442 on the Nissan Altima
- P0442 on the Nissan Rogue
- P0442 on the Nissan Sentra
- P0442 on the Jeep Grand Cherokee
- P0442 on the Jeep Wrangler
- P0442 on the Jeep Cherokee
- P0442 on the Hyundai Elantra
- P0442 on the Hyundai Sonata
- P0442 on the Hyundai Santa Fe
- P0442 on the Hyundai Tucson
- P0442 on the Kia Forte
- P0442 on the Kia Sorento
- P0442 on the Kia Sportage
- P0442 on the Kia Telluride
- P0442 on the Kia Optima
- P0442 on the Subaru Outback
- P0442 on the Subaru Forester
- P0442 on the GMC Sierra
- P0442 on the GMC Acadia
- P0442 on the Ram 1500
- P0442 on the Dodge Charger
- P0442 on the Volkswagen Jetta
- P0442 on the Mazda CX-5
- P0442 on the BMW 3 Series
- P0442 on the BMW X5
- P0442 on the Mercedes-Benz C-Class
Frequently asked questions
What does P0442 mean?
P0442 means evaporative emission system small leak detected. P0442 means a small leak (typically smaller than 0.040") in your EVAP system. Start with the gas cap; small leaks often come from cracked O-rings or hairline hose cracks.
Can I drive with code P0442?
Yes.
What is the most common cause of P0442?
Worn gas cap O-ring — Cheapest first fix.
What are the symptoms of P0442?
CEL only.
How much does it cost to fix P0442?
A typical shop repair range is $0–$400, depending on which cause it turns out to be. Cheaper causes such as leaking purge or vent valve should be ruled out first.