Kia Forte slipping problems

Filed Mar 6, 2026 · Transmission · VA

Transmission was getting stuck in gear and slipping intermittently would cause the car to not accelerate over 20mph especially in the cold unless you switched it to the manual mode and manually shifted up two gears ans then back down two gears. If you looked at the tach while it did this is would bounce between 500 and 1500rpm and then would stutter and bounce between 1500 and 2500rpm until you did the manual gear trick. Eventually it started making a strange noise. I have serviced it on time and complained to Kia before about the issue which they stated they could not repeat so there was nothing they could do at that time and now when I took it back to Kia they stated its an internal trans issue and it now needs to be replaced but there was nothing they could do as it was now out of warranty. The car has less the 95k on it. I've had cars that had well over 400k on them in the past and still ran like new. The trans should not be failing already.

Filed Sep 15, 2025 · Transmission · 32,000 miles · CA

The contact leased a 2022 Kia Forte. The contact stated that while attempting to reverse, the vehicle failed to respond while the gear shifter was in reverse(R). There was no warning light illuminated. The vehicle was taken to the dealer, where it was test-driven, and the dealer became aware that the transmission was slipping. The dealer inspected the vehicle and found clutch debris inside the transmission. The dealer cleaned the transmission, replaced the dual clutch, and reprogrammed the TCM and clutch actuator. The contact stated that the failure persisted after the dealer had serviced the vehicle. The vehicle was later taken to an independent mechanic, where it was diagnosed that the transmission clutch had failed. The vehicle was not repaired. Additionally, the contact stated that while driving and depressing the accelerator pedal, the vehicle failed to shift into the intended gear, and the vehicle was jerking, and the warning light was illuminated. The check engine warning light was illuminated. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 32,000.

Filed Apr 11, 2025 · Transmission · IL

Transmission from the original factory failed on it. I was driving when the engine check engine light came on and my car started ringing at me to get it serviced. I got the transmission replaced and not even 2 days later a brand new transmission failed yet again. This time the transmission (new) was revving up and down while driving at a consistent speed for a few minutes. Then my car started slipping gears when I tried to accelerate. The check engine light then came on again after my car started slipping gears stating to get it serviced. It is currently having its THIRD transmission put in.

Filed Mar 12, 2025 · Electrical, Engine · 137,000 miles · TX

The contact owns a 2015 Kia Forte. The contact stated that the vehicle had been taken to a local dealer and was diagnosed and determined that the catalytic converter and spark plugs were faulty and needed to be replaced. The contact stated that the parts were replaced; however, soon after the repairs, while her husband was driving 40 MPH, the transmission started slipping and failed to shift properly. There were no warning lights illuminated. The contact’s husband was able to drive the vehicle to the residence and then the vehicle was towed to the same dealer for a second diagnostic test. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 137,000.

Filed Feb 20, 2025 · Transmission · OK

The transmission went out while driving, entering the highway. It was intermittently missing a gear or slipping in about 2nd or 3rd gear. I first noticed it going about 40 mph and trying to accelerate to highway speeds. It was during a winter storm and other vehicles behind me had to brake unexpectedly. I wasn't sure if I felt for sure, so I continued to drive through many inclines and declines. The inclines became more difficult and the inability to maintain consistent speeds. I drove gently to the nearest Kia dealership which was in Salt Lake City about 60 miles away, where they informed me that I needed a new transmission. The car had about 75,000 miles on it and I bought it as a certified Pre-owned Kia with about 4,000 miles on it. The dealership plugged in the diagnostic code reader. But there were no codes detected. The service tech drove the car and felt the issue. A warranty representative inspected it about a week later. There were no warning lamps while I drove (mostly coasting downhill) from Rock Springs, WY. When I arrived to Salt Lake City, the triangle warning light came on. I drove about 10 more miles and the engine light came on. Almost all mileage has been on highways and at highways speeds as I commuted 75 miles each way for work on a turnpike between eastern Oklahoma and Fayetteville, Arkansas. There was little city driving. I lived in a small town. So, I had to travel state highways for most all errands (groceries, medical, etc.). There were no mechanical issues with the car ever until this.

Filed Jan 20, 2025 · Transmission · TX

My vehicle has 74,000 miles on it. While driving on the highway at 70 mph, the RPMs began fluctuating erratically, jumping from 2,000 to 3,000 and then from 2,000 to 5,000 before the car completely slipped into neutral. I was stranded in the middle of nowhere. Took it to the dealership and since it's out of warranty they quoted me 3500 American dollars to replace the transmission. Don't buy a Kia.

Filed Nov 7, 2024 · Electrical, Transmission · GA

The issue I’m having was confirmed by the dealership so when I drive on the highway, there’s a specific patch of highway that zigzags the car will follow that zigzag after getting off of the highway onto regular road. The car computer system will start a down shift erratically and feel like the car is pulling backwards. Also there is a lack of acceleration and it feels like the transmission is slipping, but I have confirmed with the dealership that the transmission was not slipping that the computer was shifting erratically. They would reset the computer and the car would would begin driving in a more normal state shifting correctly. I get on the highway again. The car once again will start shifting erratic. When you let go of the gas, the car downshift so many times that the car almost comes to a complete stop without hitting the brakes. The dealership has the car once again trying to figure out what’s going on with the car and why when I go on the highway the computer starts shifting erratically on that specific patch of highway. The car will pull left and right the entire time once you get off the highway the erratic shifting happens the dealership let me borrow a car which is a 2025 Kia Sorrento went on the highway with the car and had the same exact issue. The car they let me borrow is also downshifting erratically and feels like the transmission is slipping. The dealership did confirm that the car was not driving as intended, and they were confused as to why it was happening. They’ve also confirmed that the test that they’ve done on the car itself. had not passed prior to them resetting the computer.

Filed Feb 15, 2023 · Transmission · OH

On highway at 65mph engine began revving, accelerating higher on its own then speed would drop down 10-15 mph, erratic tachometer going up to max 6 at 65 mph, slipping gears and took total control of speed and then dropped down to 10mph at 6 tachometer and then wouldn’t go past 5 mph. No warning lights, no check engine.

Filed Oct 3, 2022 · Engine, Transmission · IN

When driving on a divided four lane highway, after about one hour and at about 60 mph, vehicle would not accepperate to pass. Loss of power in traffic. Felt like transmission slipping, but the check engine light came on. P0240 code. It got progressively worse. An experienced mechanic diagnosed it as the engine, and was not sure I could drive to dealership. I had it towed. The warranty (10 year, 100,000 mile), covers engine, as agreed by delar. First, the dealer said it was catalytic converter $2200. When questioned, price was "corrected" to $1,200. Most for part and less than one hour labor. On a differen phone call, repair cost increased to $3300, saying the tech mistakenly thought it was the cat near muffler, but its the cat near engine, and comes as one pice with exhaust manifold. I am waiting on written estimate that I requested, and the dealer assurance there are no other problems with the car. I suggested they drive the car, and see that the problems are the same ones they used to have to video tape and send to Kia to get repairs approved on other engines. Still waiting on the written estimate and the assurance from dealer there is no safety risk in me driving it home. I can buy the Kia part they say it needs for about $500.

Filed Oct 13, 2021 · Transmission · TX

My expectant granddaughter was driving the vehicle on a trip. The transmission started intermittently slipping en route. She stopped and when she returned to the vehicle she discovered it would no longer go forward or backwards. It is still under warranty. The vehicle is still in Colorado. This happened Sept 4, 2021. It is now 10/13. I have contacted Kia multiple times speaking with different people. I escalated the call and was told someone named Melissa was my escalations person. I have never spoken to her. I have requested a buy back of the vehicle due to possibility of reoccurrence. My granddaughter was stranded for a week. The car is at a dealership, Ft Collins Kia. We have had to pay for hotel, car rental, and a flight out of pocket. I requested reimbursement. They have not responded. I filled out the information for the buy back, but I do not have all of the paperwork. It is in the car in Colorado. We live in South Texas. No way to get access to it. This is wrong on so many levels. We are at a loss as to what to do. If the transmission had quit while she was moving the results could have been disasterous. Kia says the part is sitting on a dock somewhere waiting to be picked up. Is there an expected timeline? We had to replace the vehicle due to the cost of car rentals.