2018 Kia Optima Engine cooling Problems
- Complaints
- 14about this part
- Share
- 6%of 233 total for the year
- Median mileage
- 98,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 14 complaints about the engine cooling of the 2018 Kia Optima, 6% of the 233 complaints for this model year. Where a mileage was given, the median is 98,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“My car had been consuming 2 quarts every 1,000 miles for the past 3-4 months and the kia dealership told me that the best thing i could do is keep getting an oil change. So one day i tried starting my car and it starting shaking and turned off so i turned it back on and it shut off again. I jump started it and it shut off again and i jump started it again but it never turned on. …”
NHTSA complaint #11521243, filed 2023-05“The contact owns a 2018 Kia Optima. The contact stated that after starting the vehicle, there was an abnormal amount of smoke coming from the exhaust pipe. The contact inspected the dipstick and discovered that the engine oil level was low. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 60,000.”
NHTSA complaint #11590383, filed 2024-05, 60,000 miles“The contact owns a 2018 Kia Optima. The contact stated that while driving 65 MPH, the check engine warning light illuminated, and the vehicle shuddered and stalled. The contact was able to pull over to the side of the road. The vehicle was able to restart but was shuddering significantly. The vehicle was towed to the dealer, where it was diagnosed with a fractured valve in cylinder #1. The dealer determined that the engine needed to be replaced. The vehicle was not repaired due to the cost. …”
NHTSA complaint #11649251, filed 2025-03, 109,000 miles“The contact’s sister owns a 2018 Kia Optima. The contact stated that the vehicle was consuming an excessive amount of engine oil. The contact stated that engine oil needed to be added every 2-3 weeks. The contact stated that an unknown warning light was illuminated. The vehicle received an unknown repair; however, the failure persisted. The vehicle was taken to the dealer and was diagnosed with valve cover gasket failure. The valve cover gasket was replaced however, the failure persisted. …”
NHTSA complaint #11590203, filed 2024-05, 98,000 miles“The contact owns a 2018 Kia Optima. The contact stated that while his daughter was driving at an undisclosed speed, the check engine warning light illuminated, and the vehicle went into LIMP Mode. The vehicle was towed to an independent mechanic, who related the failure to NHTSA Campaign Number: 17V224000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 106,000.”
NHTSA complaint #11631816, filed 2024-12, 106,000 milesRelated service bulletins
- 10252085Mar 22, 2024TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI1802Y/Z) - This bulletin has been revised to include additional…
- 10220346Sep 16, 2022TECHNICAL SERVICE BULLETIN: MAINTENANCE REMINDER FEATURE - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated…
- 10219692Sep 13, 2022TECHNICAL SERVICE BULLETIN: BEARING CLEARANCE TESTER (BCT) PROCEDURES - This bulletin provides information regarding test procedure of the Bearing Clearance Tester (BCT) Special…
- 10217677Aug 4, 2022VOLUNTARY EMISSIONS SERVICE CAMPAIGN: OWNER NOTIFICATION - This document is the owner notification advising that Kia is conducting a Voluntary Emissions Service Campaign to…
- 10217678Aug 2, 2022VOLUNTARY EMISSIONS SERVICE CAMPAIGN: THETA 2.0L T-GDI ULEV LOGIC IMPROVEMENT FOR EMISSIONS (SC205) - This bulletin provides the procedure to update the emissions-related logic…
- 10217676Aug 2, 2022Sc205_poc: proof of correction card
- 10217675Aug 2, 2022Sc205_stkr: voluntary emissions service campaign completion sticker
- 10217674Aug 2, 2022VOLUNTARY EMISSIONS SERVICE CAMPAIGN: QUESTION AND ANSWER - This document is the Question and Answer Guide containing the most frequently asked questions regarding the Voluntary…
- 10217673Aug 2, 2022VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO - This document is the announcement to the dealer Parts and Service Managers that Kia is conducting a…
- 10217672Aug 2, 2022VOLUNTARY EMISSIONS SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO - This document is the announcement to the dealer principals that Kia is conducting a Voluntary Emissions Service…
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2020 | 8 | 5% |
| 2019 | 3 | 1% |
| 2018 | 14 | 6% |
| 2017 | 8 | 3% |
| 2016 | 24 | 3% |
| 2015 | 31 | 3% |
| 2014 | 16 | 3% |
| 2013 | 42 | 3% |
| 2012 | 20 | 2% |
| 2011 | 8 | 1% |
| 2010 | 2 | 3% |
| 2009 | 2 | 2% |
| 2008 | 5 | 3% |
| 2007 | 4 | 2% |
| 2006 | 9 | 6% |
| 2005 | 6 | 4% |
| 2004 | 11 | 5% |
| 2003 | 7 | 5% |
| 2002 | 7 | 7% |
| 2001 | 24 | 17% |
Other parts of the 2018 Kia Optima
132 complaintsOther or unknown
39 complaintsElectrical system
33 complaintsTransmission and drivetrain
19 complaintsBrakes
17 complaintsExterior lighting
14 complaintsFuel system
13 complaintsSteering
12 complaintsVehicle speed control
10 complaintsAir bags
9 complaintsBody and structure
7 complaintsSeat belts
5 complaints
← All problems reported for the 2018 Kia Optima
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology