garajizOBD-II code · generic
P0442
Evaporative Emission System Leak Detected (small leak)
- System
- Evaporative emission (EVAP) system
- Severity
- Low (1/5)
- Can I keep driving?
- Usually safe to drive
What does P0442 mean?
P0442 is defined as “Evaporative Emission System Leak Detected (small leak)”. This code indicates a leak or circuit problem in the EVAP system (canister, purge valve, fuel cap, hoses), which stops fuel vapour from the tank escaping into the atmosphere.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Symptoms
- Check engine light comes on
- Sometimes a smell of fuel
- The pump nozzle clicking off often while refuelling (if the canister is blocked)
Common causes
- Loose fuel cap or a cap with a damaged seal (the most common cause)
- Canister purge valve failure
- Cracked EVAP hoses
- Blocked canister or vent valve
How to diagnose it
- Check that the fuel cap closes fully and its seal is intact.
- Open and close the purge valve with a diagnostic tool to test it.
- Find the leak in the system with a smoke test.
How to fix it
- Tighten or replace the fuel cap; the code may clear itself after a few drive cycles.
- Replace the faulty valve or cracked hose.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Kia: EVAP Emission System- Leak Detected Small Leak
- Dodge: Medium EVAP Leak
Related codes
- P0441Evaporative Emission System Incorrect Purge Flow
- P0443Evaporative Emission System Purge Control Valve Circuit
- P0440Evaporative Emission System
- P0444Evaporative Emission System Purge Control Valve Circuit Open
- P043FEVAP System Leak Detection Reference Orifice High Flow
- P0445Evaporative Emission System Purge Control Valve Circuit Shorted
Look up another code
This page is general information; an exact diagnosis needs measurements and a technician’s check.