2020 Kia Optima engine problems
98 owner complaints filed with NHTSA name the engine on the 2020 Kia Optima — 68% of all complaints for this model year.
What owners report
“The oil consumption in my 2020 Kia optima is low so fast and needs to be replaced frequently. The engine is always hesitant and bucking. The car when you press the gas shakes and doesn't take off properly i have brought this up to the dealership multiple times to be told nothing is wrong. When…”
filed Sep 15, 2026
“While driving, my 2020 Kia Optima suddenly lost engine power and went into limp mode on the road, leaving me stranded and creating a severe safety hazard in traffic. The vehicle threw diagnostic trouble code P1326, which indicates a catastrophic rod bearing failure. The problem has been confirmed…”
filed Sep 8, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS: ECM LOGIC IMPROVEMENT (SC340 REVISION 5) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are…
SC340_TSB_R5 · Emissions · issued Apr 4, 2026VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION (SC340 FLIGHT 104 ) - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to improve the emissions…
SC340_OWNR_JF&JFA_104 · Emissions · issued Mar 17, 2026TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSION SECM LOGIC IMPROVEMENT (SC340 REV 4) - This bulletin has been revised to include additional information. New/revised sections…
SC340_TSB_R4 · Emissions · issued Mar 6, 2026VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION (SC340 FLIGHT 103 / JF) - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to improve the emissions…
SC340_OWNR_JF103 · Emissions · issued Dec 19, 2025TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA II 2.4L GDI EMISSIONS ECM LOGIC IMPROVEMENT (SC340) - This bulletin has been revised to include additional information. New/revised sections of…
SC340_TSB_R3 · Service Bulletin/Repair Instructions · issued Dec 10, 2025
Engine problems in other Optima years
| Year | Reports | Share |
|---|---|---|
| 2019 Optima | 88 | 43% |
| 2018 Optima | 131 | 56% |
| 2017 Optima | 164 | 64% |
| 2016 Optima | 424 | 56% |
| 2015 Optima | 621 | 62% |
| 2014 Optima | 283 | 48% |
| 2013 Optima | 612 | 44% |
| 2012 Optima | 398 | 43% |
| 2011 Optima | 256 | 43% |
| 2010 Optima | 9 | 12% |
| 2009 Optima | 14 | 12% |
| 2008 Optima | 19 | 13% |
Other reported problem areas on the 2020 Kia Optima
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.