2019 Ram P0456: What It Means & Is It Safe to Drive?
P0456 on the 2019 Ram: 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.
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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 2019 Ram
- 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 2019 Ram, repairs for P0456 typically fall between $25 and $350, depending on the root cause and labor rates in your area.
Known issues on Ram
Ram P0456 small EVAP leak is almost always the gas cap seal on these trucks. OEM Mopar caps are recommended—cheap aftermarket caps frequently fail to seal. If a new cap doesn't resolve it, the NVLD module hose is the next inspection point.
Most commonly affected models
Ram 1500 2009–2021Ram 1500 Classic 2003–2008