⌘K
Find a vehicle
RecallsCompareNewsPricing
Your vehicle
VIN decoderWindow stickerProblems by systemTitle brands
Federal filings
Service bulletinsOwner complaintsInvestigationsEarly Warning reportsWarranty extensionsDriver-assist crashesTrouble codes
Browse the record
GuidesRankingsAll makesQuarterly reportsWhat is in the data
Paperwork
Repair Claim KitCar CheckFor attorneysFor expert witnessesFor repair shopsRecall disclosure formRecall fix sheets
Tools and data
Recall WatchFleet VIN checkCost calculatorsCar crosswordAPI & data
Sign inGarage
Federal filingsHome›Trouble codes› P0440
Diagnostic trouble code

P0440 A general fault in the evaporative emissions system — the sealed circuit that stops fuel vapour escaping

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

Powertrain Generic OBD-II code 27 manufacturer filings 3 owner reports

Where P0440 shows up

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reportsParts
2019 Dodge ChallengerPower Train9—Gas cap →
2022 Dodge ChallengerPower Train4—Gas cap →
2019 Dodge ChargerEngine4—Gas cap →
2020 Jeep WranglerEngine3—Gas cap →
2019 Jeep WranglerEngine3—Gas cap →
2022 Dodge ChargerElectrical System2—Gas cap →
2017 Alfa Romeo GiuliaEngine1—Gas cap →
2022 Chrysler 300Electrical System1—Gas cap →
2018 Dodge DurangoFuel/Propulsion System—1Gas cap →
2016 Dodge DurangoFuel/Propulsion System—1Gas cap →
2016 Jeep RenegadeElectronic Stability Control—1Gas cap →

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.

Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.

P0440 by make

The same record, one make at a time: the model years, bulletins and owner reports that name P0440 on that maker’s vehicles.

Dodge 6

What it gets filed under

Electrical System 8 Power Train 7 Engine 4 Service Brakes 3 Fuel/Propulsion System 2 Exterior Lighting 1

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 Renegade at 35,000 miles Mar 6, 2018 NHTSA owner report

27 manufacturer filings name P0440. Start with what the maker wrote down.

A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.

Read the filingsSearch every bulletin →
Photo: Compagnons / Unsplash

Manufacturer filings that name it

Source: NHTSA manufacturer communications

Service bulletins and campaigns whose filed summary names P0440.

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.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

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 means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. 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.

Where to go next

pages beside this code
Filed alongside P0716 Another code that appears in the same filings and owner reports as P0440.Filed alongside P0733 Another code that appears in the same filings and owner reports as P0440.Vehicle 2019 Dodge Challenger The model year P0440 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.