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Diagnostic trouble code

P0440

3 owner reports and 27 manufacturer filings across 11 model years from Alfa Romeo, Chrysler, Dodge, Jeep.

PowertrainGeneric OBD-II code27 manufacturer filings3 owner reports

Where P0440 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2019 Dodge ChallengerPower Train9—
2022 Dodge ChallengerPower Train4—
2019 Dodge ChargerPower Train4—
2020 Jeep WranglerEngine And Engine Cooling3—
2019 Jeep WranglerEngine And Engine Cooling3—
2022 Dodge ChargerPower Train2—
2017 Alfa Romeo GiuliaElectrical System1—
2022 Chrysler 300Electrical System1—
2018 Dodge DurangoFuel/Propulsion System—1
2016 Dodge DurangoFuel/Propulsion System—1
2016 Jeep RenegadeElectronic Stability Control (Esc)—1

A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.

What it gets filed under

Power Train 10Electrical System 7Back Over Prevention 3Service Brakes, Hydraulic 2Exterior Lighting 2Fuel/Propulsion System 2
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What owners said

Source: NHTSA complaint database

Owners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.

Jeep safety concern 2016 Jeep Renegade trail hawk 4WD mileage: 35.000 our vehicle displayed check engine code (P0440)
2016 Jeep Renegadeat 35,000 milesMar 6, 2018NHTSA owner report

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P0440. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

What P0440 means

Source: SAE J2012 / OBD-II

A general fault in the evaporative emissions system — the sealed circuit that stops fuel vapour escaping.

A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.

Common questions about P0440

Source: NHTSA files and the OBD-II standard

Can I keep driving with P0440 stored?

Nobody can answer that from the code alone, and a site that does is guessing. A steady light generally means the fault was logged and the vehicle is in a reduced-risk mode; a flashing light means stop soon, because a misfiring engine can destroy a catalytic converter in minutes. The safe read of this page is the mileage and the components, not permission.

Does a code mean the car is recalled?

No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.

Why do the counts here differ from other sites?

Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.

Will clearing the code fix it?

Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.