What does code P0440 mean on a Jeep and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Jeep, 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 Jeep
- 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 Jeep, 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 Jeep
Jeep P0440 on Grand Cherokee frequently traces to a cracked charcoal canister, which sits under the body and is prone to impact damage. TJ Wranglers commonly develop EVAP leaks from split vacuum hoses that become brittle with age.
Most commonly affected models
Grand Cherokee 2000–2004Cherokee XJ 1997–2001Wrangler TJ 1997–2006