2023 Chevrolet P0456: What It Means & Is It Safe to Drive?
P0456 on the 2023 Chevrolet: Evaporative Emission System Leak Detected (Very Small Leak). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainLow urgency
What this code means
The EVAP system has detected a very small leak—often smaller than P0442. Commonly caused by a loose fuel cap or hairline crack in a hose.
Common causes on the 2023 Chevrolet
- Loose or worn gas cap seal
- Hairline crack in EVAP hoses
- Minor leak at purge or vent valve fittings
Symptoms
- Check Engine Light only
- Usually no noticeable driving symptoms
Typical fixes
- Inspect and replace gas cap if seal is hardened or cracked
- Smoke-test EVAP system to locate tiny leaks
- Repair or replace leaking hoses and fittings
Repair cost range
For a 2023 Chevrolet, repairs for P0456 typically fall between $25 and $350, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
GM P0456 on trucks is commonly a gas cap or fuel filler neck issue. On Silverado and Tahoe, the filler neck grommet can shrink over time allowing a small vapor leak. Replace the gas cap first; if P0456 persists, inspect the filler neck seal.
Most commonly affected models
Silverado 2007–2014Malibu 2008–2013Equinox 2010–2016