What does code P0442 mean on a Chevrolet and is it safe to drive?
P0442: Evaporative Emission System Leak Detected (Small Leak). Here's what it means on your Chevrolet, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainLow urgency
What this code means
The EVAP system has detected a small leak. Often caused by a loose or faulty gas cap or a small hose leak.
Common causes for your Chevrolet
- Loose, damaged, or wrong gas cap
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Leaking charcoal canister
Symptoms
- Check Engine Light
- Often no driveability issues
Typical fixes
- Tighten or replace gas cap
- Smoke test EVAP system
- Replace damaged hoses or valves
Repair cost range
For a Chevrolet, repairs for P0442 often fall between $15 and $300, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Chevrolet
P0442 on Chevrolet is often caused by a loose or faulty gas cap or a cracked EVAP purge solenoid hose. On Silverado and Tahoe, the vent solenoid mounted near the fuel tank is a common failure point.
Most commonly affected models
Silverado 2004–2014Equinox 2005–2015Malibu 2004–2012