Question 1

What does P0440 mean?

Accepted Answer

P0440 - EVAP Control System Malfunction. A general EVAP system fault. The EVAP system prevents fuel vapors from escaping. One of the most common CEL codes.

Question 2

What are the symptoms of P0440?

Accepted Answer

Check engine light, Possible fuel smell, No drivability issues

Question 3

What causes P0440?

Accepted Answer

Loose or damaged gas cap, Cracked EVAP canister, Failed purge valve, Failed vent valve, Cracked vapor hose, Fuel tank leak

Question 4

How much does it cost to fix P0440?

Accepted Answer

Typical repair cost: $0-$500. Tighten the gas cap and clear the code. If it returns, try a new cap ($10-25). This fixes it about 40% of the time.

P0440 — EVAP Control System Malfunction

Don't guess — diagnose P0440 the right way

Common symptoms of P0440

Common causes of P0440

Repair cost & difficulty

Vehicles commonly affected

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