What does code P0440 mean on a BMW and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your BMW, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainLow urgency
What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your BMW
- Gas cap loose or faulty
- Purge or vent valve stuck
- Charcoal canister or hose leak
Symptoms
- Check Engine Light
Typical fixes
- Replace gas cap
- Test purge/vent valves
- Smoke test EVAP system
Repair cost range
For a BMW, repairs for P0440 often fall between $20 and $400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on BMW
BMW EVAP codes often trace to a failed DMTL pump or a cracked vacuum line. The DMTL is BMW-specific—confirm it's faulty before replacing. Use the ISTA diagnostic routine first as aftermarket smoke testers may not pressurize the BMW system correctly.
Most commonly affected models
325i E46 2001–2005530i E60 2004–2007X5 E53 2000–2006