P0442: Evaporative Emission Control System Leak Detected (Small Leak)
Can you still drive? Yes, this code does not affect driveability. It is an emissions-related code and the vehicle will run normally.
What Does P0442 Mean?
Code P0442 indicates that the EVAP system has detected a small vapor leak. The EVAP system prevents fuel vapors from escaping into the atmosphere. The ECM tests this system by pressurizing it and monitoring for pressure drops. A small leak triggers P0442, which is often caused by something as simple as a loose gas cap.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Loose or damaged gas cap
- Cracked EVAP hose
- Faulty purge valve
- Leaking charcoal canister
- Damaged EVAP canister vent valve
Symptoms
- Check engine light on
- Faint fuel odor near vehicle
- Slightly increased emissions
Diagnostic Steps
- 1Inspect gas cap for cracks or poor seal
- 2Tighten gas cap and clear code to see if it returns
- 3Perform EVAP smoke test to locate leak
- 4Check all EVAP hoses for cracks or disconnections
- 5Test purge and vent solenoids
- 6Inspect charcoal canister for damage
Recommended Parts & Tools
EVAP purge valve
EVAP canister vent valve
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $20 - $600 |
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Chat with AI About P0442Commonly Affected Vehicles
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Frequently Asked Questions
Can a loose gas cap cause P0442?
Yes, a loose or worn gas cap is one of the most common causes of P0442. Try tightening the cap until it clicks and clear the code.
Will P0442 fail emissions?
Yes, any active check engine light will cause an emissions test failure. The code must be resolved and cleared before testing.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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