P0455 on Kia vehicles A large leak in the evaporative emissions system — often a fuel cap left off
P0455 is named on 10 Kia model years (2016–2018): 13 manufacturer filings and 1 owner report in NHTSA’s files, across Forte, Optima, Rio, Soul, Cadenza and 2 more.
Which Kia model years name P0455
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 Kia Forte | Engine | 2 | — |
| 2016 Kia Optima | Engine | 2 | — |
| 2016 Kia Rio | Engine | 2 | — |
| 2016 Kia Soul | Engine | 2 | — |
| 2018 Kia Soul | Fuel/Propulsion System | — | 1 |
| 2017 Kia Rio | Engine | 1 | — |
| 2017 Kia Sportage | Engine | 1 | — |
| 2016 Kia Cadenza | Engine | 1 | — |
| 2016 Kia K900 | Engine | 1 | — |
| 2016 Kia Sportage | Engine | 1 | — |
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.
What Kia owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
My mechanic identified code P0455, but a smoke test did not reveal a leak
Kia filings that name P0455
Source: NHTSA manufacturer communicationsBulletins and campaigns Kia filed with NHTSA whose summary names P0455. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PS469 Service bulletin2017-01-18 · Engine And Engine Cooling — Exhaust System — Emission Control
- PITSTOP: MANUAL EVAPORATIVE EMISSIONS TEST FOR HARD TO FIND/SMALL LEAKS - If the malfunction indicator lamp (MIL) is illuminated with DTC(s) P0442, P0455, P0456, or P0457 (Evaporative Emissions System-Leak detected) and the evaporative (EVAP) leak self-test resulted in NTF, a manual EVAP test is recommended.
- TSBFUE040 Service bulletin2018-04-18 · Engine And Engine Cooling — Exhaust System
- TSB - CANISTER CLOSE VALVE (CCV) REPLACEMENT - This bulletin provides the procedure to replace the Canister Close Valve (CCV) on some 2012-2017MY Rio (UB) vehicles, produced from June 21, 2011 through March 28, 2016, which may exhibit the engine warning lamp DTCs P0455 and P0456 for an evaporative emission system leak due to the Canister Close Valve (CCV) stuck open.
What P0455 means
Source: SAE J2012 / OBD-IIA large leak in the evaporative emissions system — often a fuel cap left off.
A stored code names the test that failed, never the part that caused it. The record above is what Kia and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0455 a known problem on Kia vehicles?
It is a documented one: NHTSA's files hold 13 manufacturer filings and 1 owner report naming P0455 on 10 Kia model years (2016–2018). 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 Kia models does P0455 appear on most?
2016 Forte (2 documents), 2016 Optima (2 documents), 2016 Rio (2 documents).
Does P0455 on a Kia 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.