2009 Infiniti P0440: What It Means & Is It Safe to Drive?
P0440 on the 2009 Infiniti: Evaporative Emission System Control System Malfunction. 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
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes on the 2009 Infiniti
- 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 2009 Infiniti, repairs for P0440 typically fall between $20 and $400, depending on the root cause and labor rates in your area.
Known issues on Infiniti
Infiniti P0440 EVAP system fault on older VQ35 models—gas cap first, then the EVAP canister purge volume control solenoid. The canister is mounted at the rear of the engine bay and its hoses can crack from heat cycling.
Most commonly affected models
G35 2003–2007FX35 2003–2008QX56 2004–2007