What does code P0442 mean on a Cadillac and is it safe to drive?
P0442: Evaporative Emission System Leak Detected (Small Leak). Here's what it means on your Cadillac, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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 Cadillac
- 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 Cadillac, 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 Cadillac
Cadillac P0442 on Escalade (5.3L) and SRX (3.6L) follows GM's EVAP small-leak pattern. Gas cap is first; then the vent solenoid near the fuel tank and purge valve connections. Escalade may share the filler neck rust issue with Silverado/Sierra in northern climates.
Most commonly affected models