AI Damage2020 KIA Optima: common problems
Owners of the 2020 KIA Optima filed 151 complaints with NHTSA, most often about engine and powertrain. The maker issued 98 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 151
- involving a crash
- 6
- Technical service bulletins (TSB)
- 98
What fails most often
- 1 Engine 68% of all complaints
- 2 Powertrain 18% of all complaints
- 3 Electrical system 9% of all complaints
- 4 Fuel/propulsion system 8% of all complaints
- 5 Engine and cooling 5% of all complaints
- 6 Service brakes 5% of all complaints
- 7 Air bags 5% of all complaints
- 8 Vehicle speed control 4% of all complaints
- Engine: 102 complaints (68% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 25.
- Powertrain: 27 complaints (18% of all); manufacturer bulletins for this component: 6.
- Electrical system: 14 complaints (9% of all); manufacturer bulletins for this component: 37.
- Fuel/propulsion system: 12 complaints (8% of all).
- Engine and cooling: 8 complaints (5% of all); manufacturer bulletins for this component: 17.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 1.6 L · petrol · turbo · 4 cyl
- 2 L · petrol · turbo · 4 cyl
- 2.4 L · petrol · 4 cylnamed in 8 complaints
- 2 L · hybrid · 4 cyl
- 2 L · plug-in hybrid · 4 cyl
- automatic, 6-speed
- dual-clutch (DCT), 6-speednamed in 3 complaints
- dual-clutch (DCT), 7-speednamed in 3 complaints
Drive: FWD
Symptoms owners describe
How many of the 151 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine | 102 | 1 | 25 |
| Powertrain | 27 | 0 | 6 |
| Electrical system | 14 | 0 | 37 |
| Fuel/propulsion system | 12 | 0 | 0 |
| Engine and cooling | 8 | 0 | 17 |
| Service brakes | 8 | 1 | 1 |
| Air bags | 7 | 4 | 9 |
| Vehicle speed control | 6 | 0 | 0 |
| Forward collision avoidance | 5 | 1 | 1 |
| Seat belts | 4 | 1 | 0 |
| Steering | 2 | 0 | 6 |
| Exterior lighting | 2 | 0 | 2 |
| Fuel system | 1 | 0 | 7 |
| Structure | 1 | 0 | 5 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Stable track control failed to work, the driver seatbelt did not tighten & stayed loose, & air bags did not deploy upon hitting the ditch & small trees resulting after hitting ice/water upon coming to a stop sign at a “T” cross road.
ABS module is faulty. Confirmed by professional auto shops and it’s a safety risk. Without this working properly, my car refuses to brake sometimes. Will not automatically stop when it needs to due to the spongy, unresponsive brake pedal.
My vehicle was moving when a ford 150 pulled out in front of me. Forward collision worked & slowed the vehicle to 35mph. I hit the truck doing severe front end damage to my car. The airbags did not deploy what so ever.
Air bags did not deploy. Vehicle was in motion and struck by another vehicle.
No dashboard warning lights or messages appeared before or during the incident. Although no visible flames were observed, I suspected an electrical component was overheating or melting, creating a potential fire and respiratory hazard.
At around 103K miles, I took to the dealership for a multipoint inspection for knocking when braking and my forward collision/lane assist systems going offline mid drive. I learn I have to replace my axle, despite replacing my axle in sept 2025.
Within months of purchase, the engine began exhibiting symptoms consistent with connecting rod bearing failure: engine knock, excessive oil burning (requiring oil top-ups every 2-3 weeks), and rough running. The check engine light illuminated with diagnostic code P1326 (Knock Sensor Detection System warning).
While driving to work, my 2020 Kia Optima suddenly lost engine power and went into limp mode in the middle of the highway, leaving me stranded and creating a severe safety hazard in traffic.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 422 of 2,102 model years in the NHTSA data (top 20% most complained about).
On average one model year of the Optima has 323 complaints (5 years in the data). This year has 151, below average.
What to check before buying
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- VOLUNTARY EMISSIONS SERVICE CAMPAIGN
OWNER NOTIFICATION (SC367) - This document is the owner notification advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in the Electronic Control…
- TECHNICAL SERVICE BULLETIN
VOLUNTARY EMISSIONS SERVICE CAMPAIGN: This bulletin provides information to upgrade the Electronic Control Module ‘ECM’ system software for certain 2019-2020 MY Optima vehicles manufactured from May 21, 2018, through…
- SC367_STKR
VOLUNTARY EMISSIONS SERVICE CAMPAIGN COMPLETION LABEL/STICKER
- SC367_POC
PROOF OF CORRECTION CARD
- VOLUNTARY EMISSIONS SERVICE CAMPAIGN
QUESTION AND ANSWER (SC367) – This document is the Question and Answer Guide containing the most frequently asked questions regarding Voluntary Emissions Service Campaign SC367.
- VOLUNTARY EMISSIONS SERVICE CAMPAIGN
DEALER PARTS AND SERVICE MANAGER MEMO (SC367) - This document is the announcement to dealer Parts and Service managers advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the…
- VOLUNTARY EMISSIONS SERVICE CAMPAIGN
DEALER PRINCIPAL MEMO (SC367) - This document is the announcement to the dealer principals advising that Kia is conducting an important Voluntary Emissions Service Campaign to improve the emissions software logic in…
- TECHNICAL SERVICE BULLETIN
CUSTOMER SATISFACTION: THEFT DETERRENT IGNITION CYLINDER PROTECTOR AND DECAL INSTALLATION (CS2312) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated…
- 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 indicated by a black bar in the margin…
- VOLUNTARY 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 software logic in the Electronic Control…
- TECHNICAL 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 of this bulletin are…
- CUSTOMER SATISFACTION CAMPAIGN
OWNER NOTIFICATION (CS2312) - This document is the owner notification advising that Kia is conducting Customer Satisfaction Campaign. A software upgrade that addresses the social media theft method has been made…
NHTSA lists 98 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 KIA Optima?
Owner complaints to NHTSA most often mention: engine, powertrain, electrical system. Total complaints: 151. The most frequent symptoms in complaint texts: warning lights, check engine (29%), oil leak or consumption (26%), knocking, grinding or other noise (17%).
How many service bulletins (TSB) were issued for the 2020 KIA Optima?
NHTSA lists 98 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 KIA Optima from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.