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Home›Trouble codes›P0456› Ram
Diagnostic trouble code · Ram

P0456 on Ram vehicles A very small leak in the evaporative emissions system

P0456 is named on 11 Ram model years (2016–2021): 48 manufacturer filings and 1 owner report in NHTSA’s files, across 1500, 2500, 3500, Promaster City, ProMaster.

Powertrain 11 model years 48 manufacturer filings 1 owner report

Which Ram model years name P0456

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2019 Ram 1500Power Train111
2016 Ram 2500Power Train6—
2016 Ram 3500Electrical System6—
2016 Ram 1500Power Train5—
2016 Ram Promaster CityElectrical System4—
2021 Ram 1500Fuel/Propulsion System3—
2021 Ram 2500Fuel/Propulsion System3—
2021 Ram 3500Fuel/Propulsion System3—
2021 Ram ProMasterFuel/Propulsion System3—
2019 Ram 2500Power Train2—
2019 Ram 3500Electrical System2—

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Power Train 18 Electrical System 12 Fuel/Propulsion System 10 Exterior Lighting 2
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Ram filings that name P0456

Source: NHTSA manufacturer communications

Bulletins and campaigns Ram filed with NHTSA whose summary names P0456. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What P0456 means

Source: SAE J2012 / OBD-II

A very small leak in the evaporative emissions system.

A stored code names the test that failed, never the part that caused it. The record above is what Ram and its owners have filed about it; the code’s page across every make has the whole file.

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

Source: NHTSA files and the OBD-II standard

Is P0456 a known problem on Ram vehicles?

It is a documented one: NHTSA's files hold 48 manufacturer filings and 1 owner report naming P0456 on 11 Ram model years (2016–2021). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which Ram models does P0456 appear on most?

2019 1500 (12 documents), 2016 2500 (6 documents), 2016 3500 (6 documents).

Does P0456 on a Ram mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.

Where to go next

pages beside this code
Filed alongside P0442 Another code that appears in the same filings and owner reports as P0456.Filed alongside P04F0 Another code that appears in the same filings and owner reports as P0456.Vehicle 2019 Ram 1500 The model year P0456 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.