Kia Forte jerking problems

Filed Jun 15, 2026 · Engine, Fuel system · VA

The car is jerking while driving. It's caused the car to overheat. It's hard to start up and usually stalls out. It has stalled out while driving almost causing a accident. The engine light came on. I took it for a diagnostic and it was code P0172 for high pressure fuel pump. Before the incident date it was already hard to start prior to the engine light coming on. It sometimes causes smoke to come out of the exhaust. There was also smoke from under the hood in the engine compartment and as soon as I put gas in the car it runs out very quickly. This issue could have caused and accident or even a fire. It's unsafe to drive and from other reviews I've seen several other Kia drivers have experienced issues with this same faulty part, which is expensive to fix.

Filed Apr 20, 2026 · Transmission · 157,000 miles · DE

The contact owns a 2010 Kia Forte. The contact stated the vehicle was taken to a dealer for several recall repairs, and repair under Manufacturer Recall Number: SC165A. After the recall repairs were performed, while driving approximately 60 MPH on the highway with the clutch engaged and the vehicle in gear, the vehicle started jerking and unexpectedly decelerated. The contact moved over to the side of the road, and the vehicle became inoperable. The vehicle was first towed to the residence and then to the dealer for inspection. The vehicle was not diagnosed or repaired; however, the contact was advised by the dealer that the failure was due to normal wear and tear. However, the contact believed that the failure was caused by the recall repair under Manufacturer Recall Number: SC165A. The manufacturer was not notified of the failure. The approximate failure mileage was 157,000.

Filed Mar 30, 2026 · Electrical, Engine · LA

I am reporting a serious and ongoing safety issue involving my 2023 Kia Forte GT. The vehicle has experienced persistent mechanical problems, including a check engine light and multiple diagnostic trouble codes, including P0420 (catalyst system efficiency below threshold – Bank 1), P0300 (random/multiple cylinder misfire), P0304 (cylinder 4 misfire), and P0301 (cylinder 1 misfire). These codes have appeared as stored, pending, and permanent, indicating ongoing and unresolved engine and emissions system issues. In addition to these mechanical problems, the vehicle is emitting strong and concerning chemical fumes into the cabin during operation. These fumes are noticeable while driving and create a hazardous environment for occupants, raising concerns of toxic exposure and making the vehicle unsafe to operate. The vehicle also exhibits drivability issues, including jerking and performance irregularities when accelerating. Despite multiple attempts to have the vehicle diagnosed and repaired under warranty at authorized Kia dealerships, including All Star Kia East and All Star Kia Seigen Lane, the dealerships have refused to properly diagnose or repair the vehicle. I have been informed that my vehicle or account is “flagged in all systems,” and service has been denied on that basis. The refusal to address an emissions-related defect, combined with active misfires and the presence of chemical fumes entering the cabin, presents a serious safety risk. I am requesting that this issue be investigated as a potential safety defect affecting this vehicle.

Filed Feb 26, 2026 · Brakes · 273,000 miles · CA

The contact owns a 2011 Kia Forte. The contact stated that while driving 45 MPH, the TPMS, red brake light, and several unknown warning lights were illuminated. The contact stated that the vehicle was jumping and jerking during acceleration and deceleration. After restarting the vehicle, there was resistance while accelerating, and the jerking persisted. The contact stated that the failures started one week after the vehicle was repaired under the federal safety agency Campaign Number: 23V652000 (SERVICE BRAKES, HYDRAULIC). The vehicle was driven to an independent mechanic but was not diagnosed. The vehicle was then driven to a dealer, but was not repaired. The manufacturer was notified of the failure. The failure mileage was 273,000.

Filed Jan 9, 2026 · Brakes · 159,000 miles · NM · crash · 2 injuries

The contact owns a 2013 Kia Forte. The contact stated that while driving at 30 MPH, the brake pedal failed to operate as needed and depressed to the floorboard without warning. As a result of the brake failure, the contact crashed into the rear of another vehicle. The contact stated that both front driver and front passenger seat belts failed to retract as both she and her son were violently jerked forward upon impact. The air bags deployed upon impact. A police report was filed. Both the contact and her son were treated for minor pain and bruising at a local hospital. The whereabouts of the other driver are unknown. The vehicle was driven to an independent mechanic, where the contact was given an estimate for the repair. Neither the manufacturer nor the dealer had yet been notified of the failure. Upon investigation, the contact discovered that there were two recalls on the vehicle, the federal safety agency Campaign Number: 17V773000 (Service Brakes, Hydraulics) and the federal safety agency Campaign Number: 23V652000 (Service Brakes, Hydraulics). The vehicle was not repaired and remained in the possession of the independent mechanic, where it could be salvaged. The failure mileage was approximately 159,000.

Filed Dec 3, 2025 · Electrical, Engine · 168,000 miles · FL

The contact owns a 2015 Kia Forte. The contact stated while driving 64 MPH, the vehicle jerked and vibrated, and the vehicle failed to accelerate as intended while depressing the accelerator pedal. The vehicle then stalled. The contact was able to coast to the side of the road. Multiple warning lights were illuminated. The contact was assisted with jumpstarting the vehicle. The contact was able to continue driving; however, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The check engine warning light illuminated, and the battery light illuminated intermittently. The contact was able to pull into a gas station. The contact called his daughter, who went to the gas station and jumpstarted the vehicle. The contact stopped by Auto Zone to have the vehicle diagnosed, where it was diagnosed and DTCs: P2191, P0562, C1101, C1102, C1201, C1204, C1207, C1208, C1210, C1211, C1237, C1260, C1513, C1613, and C1688 were retrieved. In addition, the battery showed codes that fluctuated constantly. The vehicle was taken to the dealer pending an inspection. The vehicle remained at the dealer unrepaired. The contact stated that recently the low oil warning light was illuminated, and the fuel level was low; however, the oil level and fuel level were not low. The ABS, traction control, steering, and tire pressure warning lights were illuminated. In addition, the brake warning light failed to function as intended. The contact replaced the brake lights however, the failure persisted. Upon further investigation, the contact related the failure to the federal safety agency Campaign Number: 20V750000 (Engine); however, the VIN was not included. The manufacturer was not made aware of the failure. The failure mileage was approximately 168,000.

Filed Nov 3, 2025 · Engine · TN

Back in July my car started jerking, stalling, and smoking. There was a recall 20v750 open for engine fires. The dealership check it out and said everything looked good. They installed a knock sensor related to the problem. Last week my car did it again leaving me stalled on the interstate at night. There is now a P1326 code for the knock sensor which confirms that there was a issue. However I'm being told that due to my mileage the warranty had expired and there isn't anything they can do.

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 Sep 12, 2025 · Driver assistance, Engine · MO

The lane assist malfunction and periodically jerks. Very unsafe I no longer use this feature . To keep control of the vehicle. I never got it inspected. As the lane assist was in use and it would jerk it would alert me of a lane departure . I mention this to include every known problem I have experienced with the vehicle. The problem That brought me here. Is my engine light came on today. Leading up to this. I have had oil leaks since I've owned the car. Im adding oil in between oil changes due to it being low. In the beginning it was a hint of smell of gas in the oil. I was informed to do more frequent oil changes. Over time the smell of gas grew stronger . No Indication to a problem then. Now the smell of gas is prominent in the oil. When the dip stick is checked its always needing more oil and smells of gas and has blackness like burning in the oil. Now there's a check engine light on. And everything I looked up says to discontinue driving the car. I am having a mechanic look at it with a code reader.

Filed Sep 3, 2025 · Driver assistance, Transmission · 14,000 miles · IN · crash

The contact owns a 2024 Kia Forte GT. The contact stated that while driving approximately 25 MPH on an off-ramp and making a right turn, the lane assist feature had malfunctioned, causing the vehicle to steer and crash into the guard rail. During the incident, the passenger side of the vehicle was damaged along with the guard rail. No injuries were reported. A police report was taken at the scene, and the vehicle was driven away. The vehicle was taken to the local dealer, who was unable to determine the cause of the failure. Previously, while driving, the vehicle had experienced transmission failures, causing the vehicle to jerk and shudder while attempting to accelerate. The RMPS failed to increase over 1.5 and failed to accelerate during normal mode however, in sports mode, the vehicle performed normally. The cause of the failure was not determined. The manufacturer was notified of the failures. The failure mileage was 14,000.