2012 Buick P0440: What It Means & Is It Safe to Drive?
P0440 on the 2012 Buick: 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 2012 Buick
- 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 2012 Buick, repairs for P0440 typically fall between $20 and $400, depending on the root cause and labor rates in your area.
Known issues on Buick
Buick P0440 EVAP system failure on older platforms starts with the gas cap. On Park Avenue and LeSabre, the EVAP vent solenoid near the fuel tank degrades with age; test it before conducting a smoke test.
Most commonly affected models
Park Avenue 2001–2005Century 2001–2005LeSabre 2001–2005