What does code P0440 mean on a Acura and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Acura, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your Acura
- 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 Acura, 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 Acura
Acura P0440 EVAP large leak is typically a gas cap or a failed purge valve solenoid. These models share Honda's EVAP architecture. The purge solenoid mounted on the intake manifold is the most common active component failure. Replace the cap first, then inspect the purge valve.
Most commonly affected models
TL 2004–2008MDX 2003–2006TSX 2004–2008