10.0

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
0 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2018 Kia Optima fuel system problems

fuel system problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2018 Kia Optima:

Unsubscribe any time. We don't sell/share your email.

2018 Kia Optima Owner Comments

problem #4

Jun 032022

Optima

  • miles

A D V E R T I S E M E N T S

I brought the vehicle into Kia service for the recall including a computer operating system upgrade. After the recall work was done the car driving at high highway speeds failed, and immediately slowed down, almost causing a rear collision. The computer system turned off the drive mechanism and I was left with only the electric motor to propel the car. The car barely limped off the highway. The car was brought to the Kia Dealer and no defect was found and the computer was reset. This problem occurred two more times, at highway speeds (70 mph) and Kia was contacted to find out why the problems occurred and how to fix it. To date, Kia has not responded to how to fix the problem and has ignored all phone calls and emails. The car has been in the shop for 3 months. The problem occurred only after Kia upgraded the software due to the recall. Additionally, the recall work was done. I do not know why the recall work was not reported.

- Lake Forest , IL, USA

problem #3

Mar 082020

Optima

  • miles
Trying to cut off and jerks when stopping vehicle

- Greensboro , NC, USA

problem #2

Aug 042022

Optima

  • miles
ECM telling fuel pump to put too much gas, causing exhaust into cabin, unnoticed while in car, but hair and cloth reak of exhaust and getting headaches. Reduced mileage by 20+mpg from 30+ to 11mpg. BSD- no lights or codes thrown by 3rd party, but dealer said there was a code on the BSD. BSD was not working and no codes appeared. NO LIGHTS OR CODES FOR FUEL ISSUE OR BSD, but dealer said there is a recall that I cannot find for fuel and said there was a code for BSD, but it didn-€™t pop up on my husband-€™s code reader previously.

- Roseville, CA, USA

problem #1

Jul 202019

Optima

  • miles
When driving this vehicle rattles and shakes it has a burning smell/gas smell. It cuts off while driving. Looses oil.oil at low level before due. This make and model is no longer being manufactured. It has a known history of engine problems. Why were consumers allowed to buy this car. Problems are active and ongoing. Started about a year or close to a year after purchase. It is a lemon. The dealer wants to diagnose the engine, but they already know the engine is no good.

- Upper Marlboro, MD, USA

Search CarComplaints.com for these popular complaint phrases...

Not what you are looking for?