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

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.

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

Bulletins and campaigns Kia 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.

• TSB_FUE046 Service bulletin
  2020-06-03 · Fuel System, Gasoline
• TECHNICAL SERVICE BULLETIN: COMBINATION TSB/SERVICE ACTION: AIR FILTER AND NVLD REPLACEMENT (SA421) - This bulletin provides the procedure to perform an evaporative leak test and replace the fuel tank air filter, and, if necessary, the Natural Vacuum Leak Detector (NVLD) on some Optima (JF HEV) vehicles, produced from June 27, 2016 through January 7, 2019, which may experience an evaporative leak
• PS567_R2 Service bulletin
  2020-11-20 · Fuel System, Gasoline
• PITSTOP: DTC P0456/P0442 WITH FUEL PUMP SEAL DAMAGE - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This Pitstop provides information regarding DTC P0456/P0442 (Evaporative Emissions System (Very) Small Leak Detected) or fuel smell on some 2017-2018MY Cadenza (YG) vehicles and some Optima H
• PS567_R1 Service bulletin
  2018-10-01 · Engine And Engine Cooling — Exhaust System — Emission Control
• PITSTOP: DTC P0456/P0442 WITH FUEL PUMP SEAL DAMAGE - This Pitstop provides information regarding DTC P0456/P0442 (Evaporative Emissions System ? (Very) Small Leak Detected) or fuel smell on some 2017MY Cadenza (YG) vehicles, produced before August 7, 2017 and some Optima Hybrid (JF HEV) vehicles, produced before August 16, 2017. When addressing the concern with DTC P0456/P0442 and the vapor lines
• PS469 Service bulletin
  2017-01-18 · 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.
• TSB_FUE049 Service bulletin
  2021-01-12 · Equipment Adaptive/Mobility
• TECHNICAL SERVICE BULLETIN: COMBINATION TSB / SERVICE ACTION: AIR FILTER AND NVLD REPLACEMENT (SA447) - This bulletin provides the procedure to perform an evaporative leak test and replace the Fuel Tank Air Filter, and, if necessary, the Natural Vacuum Leak Detector (NVLD) on some 11-16MY Kia vehicles listed in the table below, which may experience an evaporative leak concern with DTC P0456.
• PS567 Service bulletin
  2018-07-09 · Fuel System, Gasoline
• PITSTOP - DTC P0456/P0442 WITH FUEL PUMP SEAL DAMAGE - This Pitstop provides information regarding DTC P0456/P0442 (Evaporative Emissions System ? (Very) Small Leak Detected) or fuel smell on some 2017MY Cadenza (YG) vehicles.
• TSBFUE041 Service bulletin
  2019-08-26 · Fuel System, Gasoline
• TSBFUE041: COMBINATION TSB / SERVICE ACTION: AIR FILTER KIT & NVLD REPLACEMENT (SA395) - This bulletin provides the procedure to perform an evaporative leak test and replace the fuel tank air filter, and, if necessary, the natural vacuum leak detector (NVLD) on some Niro (DE HEV) vehicles, produced from November 1, 2016 through March 22, 2019, which may experience an evaporative leak concern with
• TSBFUE040 Service bulletin
  2018-04-18 · 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.
• TSB_FUE057 Service bulletin
  2022-03-31 · Electrical System
• This bulletin provides the procedure to update the software logic of the Engine Control Module (ECM) system on some 2022MY Carnival (KA4) vehicles produced from January 4, 2021 through January 12, 2022, which may exhibit an MIL 'ON' with DTC P0456. Follow the procedure outlined in this publication to apply the improved logic to the 'ECM' system using the KDS ECU Upgrade function as described in th
• TSBFUE042 Service bulletin
  2019-09-12 · Fuel System, Gasoline
• TSB: SERVICE ACTION: 3.3 GDI ULEV ECU MIL WITH DTC P0456 LOGIC IMPROVEMENT (SA397) - This bulletin provides the procedure to improve the logic of the Engine Control Module (ECM) on some 2019-2020MY Sedona (YP) 3.3 GDI 8AT ULEV vehicles, produced from February 13, 2018 through August 27, 2019, which may exhibit an ECM MIL ON with DTC P0456.
• TSB_ENG328 Service bulletin
  2022-05-18 · Electrical System
• TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ECM LOGIC IMPROVEMENT FOR DTC P0456/P013E (SA498) - This bulletin provides the procedure to update the software logic of the Engine Control Module (ECM) system on some 2023MY Sportage (NQ5/NQ5a) vehicles equipped with Theta 2.5L GDI engine and 8AT produced in the date ranges shown below, which may exhibit a MIL ON with DTC P0456 or P013E. Follow the proc

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.