There are 19 owner-reported speed control & cruise complaints for the 2016 Kia Optimain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
While driving the car will not accelerate past 49mph in turbo mode and 61mph in regular mode and rpm will not go above 1800. And it jerks and studders. Blinking check engine light and consumes a ridiculous amount of oil even though regular maintenance performed. I have read several engine issues with this model and cannot find recall info
On [XXX] I was proceeding to come up to the stop sign when out of no where the car started rapidly accelerating and when I proceeded to step on the brakes it wouldn't stop it only sped up more. And caused a server accident that left me with serious injuries. And I cause of the defect they found me at fault said I failed to yield at a stop sign. The car never was fixed from the 2 times the motor has to be replaced by Galena Kia in fort Myers fl. They even caused the ac to go power retarded and wouldn't work half the time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Car was at about 70,000 upon purchase. Once driving it regularly, I immediately noticed a faint knocking noise upon acceleration. Also, when coasting the speed adjusted on its own intermittently, both up & down, not by much but enough that I felt it on the gas pedal. Other times it fails to accelerate when pushing on the gas pedal. I have to release the pedal & try again, sometimes more than once before it finally accelerates. Despite doing regular oil changes, my engine burns through oil long before next oil change is due, so I have to add 1 - 2 quarts of oil in-between changes. I was barely at 80,000 miles when engine started seizing & the following day the check engine light came on. It had to be towed to be serviced. They said the fuel injector or pump (not sure which) was allowing fuel to flood my engine which caused its damage. Even with what the warranty covered I had to pay $500 out of pocket so there were a lot of repairs. I can get a detailed print out of service if needed. When I do oil changes there's oil under the oil pan somehow, but its not leaking because there is no oil where I park. As of lately, even though all fluids are good, when the car is idle with a/c on, the temperature starts to go up until the car is in motion again, then the temperature goes back down quickly. It has only overheated once, which was the first time I noticed the problem because I was parked at a gas station on a hot day checking my phone & the a/c started blowing warm & dash said, "engine overheated". Only happen the one time because I have been cautious about watching the temperature to avoid it happening again. I recently passed emissions & had AutoZone do code reader check & nothing came back. In order to figure out problem I'd have to get diagnostics test that requires I leave the car for at least 2 days so it hasn't been something I can manage yet. My car is available for inspection if needed & I'm happy to provide detailed print out of repairs if requested.
While we were driving home (3 people in my car), with no notice, my car lost complete acceleration and broke down while we were on the highway. We hardly had notice to understand what was happening, let alone the other cars/people behind us on the highway where we almost got hit before being able to pull over to the side of the highway. We then had to wait for a tow-truck, again, on the shoulder of a very busy highway. Later, I came to find out that this was "sudden and unexpected engine failure" that occurs in multiple models of Kia and Hyundai that was included in the Hyundai and Kia Engine Litigation, Case No. 8:17-cv-00838, and Hyundai and Kia Engine Litigation II, No. 8:18-cv-02223-JLS-JDE, New Theta II Class Action Lawsuit. Unfortunately, this was the first time I had heard of this, as I'd never received any recalls or notices for my car around this, even though my car is a part of this. As I am in contact with Kia Customer Care attempting to resolve this issue - which has been an awful experience so far - they have informed me that the RECALL CAMPAIGN PI1802B - PI1802 ECU UPGRADE - is a "product improvement" instead of a safety issue, in which I COMPLETELY disagree! This put the 3 people inside my car at the time of the engine failure in danger on the highway with zero notice except for when it happened, as well as the other people/cars on the highway surrounding my car. Clearly this has been a much wider issue for Kia and Hyundai that has called for class action lawsuits, and my experience has been terrible so far trying to get this resolved. I'm extremely unhappy with their customer service and "help" this far, and even more upset that this did cause safety issues that it feels they don't care at all about correcting or taking care of their customers.
When accelerating the car will randomly loose all power from the engine. The electrical systems will stay on but the car RPMs will drop to zero. The accelerator will not provide acceleration when being pressed. The car has to be turned off and then turned back on for power to be restored. The check engine light, the oil light and another warning light will come on.
Driving 80 miles an hour several hours from home on a major interstate and my car shut off. Pulled over on side of interstate and check engine light came on and car won’t accelerate and is making a knocking noise
It started shaking really bad out of no where , then wasn’t going faster than 80 then down to 65 but wouldn’t go more than 80 with my foot all the way on the gas. As soon as I made it to work tonight the car cut off. I got a jump the car was still shaking & wouldn’t stay on if I let my foot off of the gas. I started it again without the cables but it cut right back off. I saw on cars.com it’s a recall for the similar thing, number Sc172. I have been having fuel leaks for a while and had my knock sensor replaced from a previous recall. Now I have no way home.
On 2/24 I was driving on Ben Hill Griffin Parkway, I was in the middle lane going thru an intersection, when suddenly while attempting to accelerate to go thru the light, all of my dash lights came on and the gas petal stopped working completely. I had cars in front, behind and on sides of me and I was unable to move out of the way. I attempted to restart the car to no avail. This could have been an incredibly deadly and dangerous situation and was extremely scary. With help I was able to move my car out of the way, call a tow truck and have it taken to the nearest Kia Dealership (Galeana Kia, 14483 Tamiami Trail, Ft. Myers) who advised they would evaluate the car and get back to me the next day. Tuesday I got word that my engine had seized and there was less than 1 qt of oil in it. I couldn't believe this as I just had an oil change 6 weeks prior. The service advisor, Jeff, said when an engine seizes they report it to Kia to see if they will replace but that Kia tech team advised they were declining replacing my engine as I didn't take my car to Kia for service and there weren't enough carfax reports to show proper care. This made no sense as I get my oil changed every 5k and use syntenic oil. I proceeded to send many oil change receipts only for them then tell me "it's owners responsibility to check oil between oil changes" and they aren't going to assist in any way. Sharing this story with others led me to learn that Kia is supposed to warranty these engines to 150k due to this being a known issue and multiple class action lawsuits about the engines burning oil and seizing while driving. I was in the middle of an intersection, that could have cost me my life! I called Kia Corp and they told me to work with dealership and they couldn't do anything for me. This after just replacing 4 window regulators where the regulator dies and your windows fall down (another safety hazard.) I appreciate you looking into and addressing this safety injustice for me.
PULLED INTO NEIGHBORHOOD, PUT FOOT ON PEDAL TO ACCELERATE, AND CAR TOOK OFF. WOULD NOT STOP. WENT B/W 80-100 MPH ON IT'S OWN, BEFORE MY MOTHER DROVE OFF AN EMBANKMENT, AND FLIPPED HER CAR END OVER END. NEARLY KILLING HER, AS WELL AS HER DOG. CURRENTLY HOSPITALIZED.*DT*DT*DT*DT*DT
WHILE DRIVING THE CAR THE FUEL CONSUMPTION IN THE MOTOR WOULD BOG THE ENGINE DOWN TO WHERE IT WOULD BARELY GO OVER 40 MPH ON THE HIGHWAY. AT THIS TIME THE ENGINE TROUBLE INDICATOR LIGHT WOULD COME ON AND NOT GO OFF. I IMMEDIATELY TOOK IT TO THE LOCAL KIA DEALERSHIP IN MT. HOPE, WV.. THE MECHANIC CHANGED OUT THE SENSOR THAT SHOWED UP ON HIS METER AND THE ENGINE SEEMED TO DO GOOD WHILE IN THE SHOP BUT WHEN THEY BACKED IT OUT OF THE SHOP BAY, ANOTHER SENSOR LIGHR CAME ON. WE HAD ALREADY PAID THE DEALERSHIP $206, THEY WOULD NOT RETURN OUR MONEY
EVER SINCE I HAD MY CAR SERVICED ABOUT 3 WEEKS AGO MY CAR HAS BEEN SLUGGISH AND ACCELERATION HAS WEAKENED, ALSO I'M GETTING POORER GAS MILEAGE. THE RECALL THAT WAS FIXED HAS GREATLY REDUCED THE PERFORMANCE OF MY VEHICLE.
ENGINE RUMBLES LIKE IT IS ABOUT TO DIE INTERMITTENTLY WHEN I LET OFF THE BRAKE AND BEFORE I PRESS THE GAS AFTER BEING STOPPED IN TRAFFIC ON CITY STREETS. I OFTEN HAVE TO PRESS THE GAS PEDAL HALF WAY DOWN TO GET IT TO GAIN SPEED ON CITY STREETS, IT FEELS SLUGGISH, AND SHIFTING DOES NOT FEEL VERY SMOOTH.
INTERMITTENTLY CAR WILL SHUDDER (JERK FORWARD AND SLOW, JERK FORWARD AND SLOW) MANY TIMES WHEN ACCELERATING, EITHER FROM A STOP OR WHILE ACCELERATING FROM LOW SPEEDS (LESS THAN 45MPH) IT SEEMS POSSIBLE GEAR CHANGING IS NOT SMOOTH. AND CAN BE DANGEROUS WHEN ATTEMPTING TO MERGE INTO TRAFFIC AS CAR DOES NOT ACCELERATE AS IT SHOULD. HAVE TAKEN THE CAR TO KIA WHO REPORT THAT NOTHING WAS WRONG WITH CAR WHEN THEY TEST DROVE IT. PROBLEM SEEMS WORSE WHEN IT IS HOT OR COLD OUTSIDE.
THE CAR STUMBLES TO START AND WHEN I ACCELERATE IT FLUTTERS UNTIL PICKING UP SPEED. THIS HAPPENED ON HIGHWAY 43.
2016 KIA OPTIMA. CONSUMER WRITES WITH CONCERNS MALFUNCTIONS WITH ADVANCED SMART CRUISE CONTROL. *AS *TR
TL* THE CONTACT OWNS A 2016 KIA OPTIMA. WHILE DRIVING VARIOUS SPEEDS, THE VEHICLE ACCELERATED INDEPENDENTLY AND THE ENGINE RPMS DRASTICALLY INCREASED TO 6 OR 7. THE CONTACT ALSO STATED THAT THE CHECK ENGINE WARNING INDICATOR ILLUMINATED AND THERE WAS A BURNING ODOR COMING FROM THE ENGINE. IN ADDITION, THE VEHICLE WAS LEAKING OIL. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE CVT VALVE NEEDED TO BE REPLACED. THE DEALER STATED THAT THE VEHICLE WAS NUMBER 75 ON THE WAITING LIST FOR THE REPAIRS AND PROVIDED A LOANER VEHICLE. TWO DAYS LATER, THE CONTACT WAS INFORMED BY THE DEALER THAT THEY PERFORMED AN INTERIM REPAIR AND THAT THE VEHICLE COULD BE DRIVEN. THE DEALER ORDERED THE PART FOR A PERMANENT REPAIR. THE CONTACT FELT UNSAFE DRIVING THE VEHICLE. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 1,000.
TL* THE CONTACT OWNS A 2016 KIA OPTIMA. THE CONTACT STATED THAT THE VEHICLE HAD A FEW SECONDS DELAY IN ACCELERATION. THE CONTACT TOOK THE VEHICLE TO A DEALER WHERE IT WAS DIAGNOSED THAT THERE WAS A SENSOR DELAY. THE MANUFACTURER WAS NOT NOTIFIED OF THE ISSUE. THE FAILURE MILEAGE WAS 200.
I HAVE BEEN EXPERIENCING ISSUES WITH MY 2016 KIA OPTIMA SINCE I PURCHASED IT ON SEPTEMBER, 5TH 2016. A SHORT TIME AFTER OWNING MY NEW VEHICLE, FIRST THE CAR STARTED TO HESITATE WHEN STARTING AS IF IT WAS STRUGGLING TO START, THE PUSH BUTTON WOULD TURN RED AND THE INDICATOR LIGHTS WOULD LIGHT UP ON THE DASHBOARD AS IF THE KEY WAS NOT RECOGNIZED IN THE CAR. THE CAR WOULD ALSO SELF ACCELERATE. ON OR AROUND AUGUST 16TH OR 17TH THE CAR STALLED OUT WHILE IT WAS BEING DRIVEN,WE ATTEMPTED TO RESTART THE CAR AND IT TURNED ON LIKE NORMAL SO THE TOW WAS CANCELED. , THE SERVICE WRITER & KIA ALL HAVE COPIES OF THE VIDEOS THE MECHANIC HAS ALSO TOLD ME HE WAS ABLE TO DUPLICATE THE ISSUE, THE SOLUTION WAS TO CHANGE THE FUEL PUMP AND SERVICE THE FUEL DELIVERY SYSTEM. UPON THE SERVICES BEING COMPLETED WE WERE CONTACTED BY THE SERVICE MANAGER, AND KIA THAT THE CAR WAS READY TO BE PICKED UP ON SEPTEMBER 6TH 2017. WHILE DRIVING THE VEHICLE HOME WE NOTICED SOME HESITATION WHILE IDLE, ALSO SOME STRONG ACCELERATION WHEN TAKING OFF FROM RED-LIGHT OR STOP SIGN. WHILE PARKED WE NOTICED SOME STRONG VIBRATION FROM THE MOTOR WHICH THE CAR HAD NOT HAD PREVIOUSLY BEFORE SERVICE. ALSO AFTER SEVERAL ATTEMPTS OF STARTING THE CAR, THE CAR WOULD EITHER START ROUGH, AND ALSO STILL HAD THE SAME ORIGINAL OCCURRENCE AS BEFORE WITH THE KEY NOT BEING RECOGNIZED IN THE CAR. WITH THE CAR NOT FULLY STARTING AND THE PUSH BUTTON TURNING RED WITH THE INSTRUMENT PANEL LIGHTING UP WITH THE KEY NOT IN CAR LIGHT ALONG WITH SOME OTHERS. ON THURSDAY SEPTEMBER 7TH, 2017 AT ABOUT 4:30PM I HAD THE CRUISE CONTROL SET TO 80 MPH, THE CAR HESITATED A COUPLE TIMES, THEN SELF DECELERATED TO 73 MPH, REACCELERATED TO 82 MPH THEN SELF ADJUSTED TO 80 MPH, I CONTACTED THE DEALERSHIP RIGHT AFTER THE OCCURRENCE I WAS TOLD I HAD TO WAIT TO BRING THE CAR BACK IN THEY HAD NO LOANER VEHICLES, NOT TO USE THE CRUISE CONTROL FEATURE.
SINCE I HAD THE CAR IN AUG2016 BRAND NEW WHEN I GIVE IT GAS THE VALVES PING AND PEAK EXTREMELY BAD NOT MATTER WHAT FUEL I USE ALSO THE AC KEEPS LOOSING POWER IT WILL BLOW FINE THEN IT ALMOST GOES OFF WHILE STILL DRIVING THE SAME SPEED. ALSO SOMETIMES WHEN THIS HAPPENS I HAVE A MISS OR HESITATION IN THE ENGINE. THERE HAS ALSO BEEN A POP NOISE IN THE BACK END WHEN I STOP OR SLOW DOWN SINCE I HAVE HAD THE VEHICLE. I HAVE TAKEN MY CAR 6 TIMES TO THE LOCAL DEALER IN CHAS WV WHERE I PURCHASED THE CAR AND THEY KEEP SAYING THEY CAN'T DIGNOSE THE PROBLEM THEY HAVE TO CONTACT KIA AND NEVER HAVE AN ANSWER WHEH I TAKE THE CAR BACK OR CONTACT THEM.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026