What does code P0440 mean on a Ram and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Ram, 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 Ram
- 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 Ram, 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 Ram
Ram P0440 EVAP system leak commonly traces to the gas cap or a cracked EVAP canister hose. On older Ram 1500 Classic trucks, the NVLD module near the fuel tank is a frequent failure point. Replace the gas cap first; if P0440 returns, inspect the NVLD hose connections.
Most commonly affected models
Ram 1500 2009–2018Ram 1500 Classic 2003–2008