2013 BMW P0456: What It Means & Is It Safe to Drive?
P0456 on the 2013 BMW: 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.
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 2013 BMW
- 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 2013 BMW, repairs for P0456 typically fall between $25 and $350, depending on the root cause and labor rates in your area.
Known issues on BMW
BMW P0456-equivalent small leak codes often come from a leaking DMTL pump check valve or a micro-crack in the EVAP hose. BMW's DMTL test runs at night in cold conditions—the fault may not reproduce during shop testing. Use ISTA to run the DMTL diagnostic test sequence before replacing parts.
Most commonly affected models