2012 Hyundai Sonata power train problems

“Knock sensor needs to be replaced upon evaluation of an inspection on March 27, 2026. It failed a mission codes and upon my understanding the knock sensor one circuit range performance pink wonder single sensor is an engine failure as well as I did an ODB test myself on May 19 of 2026 for the Knox sensor as well and the check engine dominator reading at 2111 the the code indicated that bank one Knox and electrical circuit was out of it upper range or had it perform problem for a predetermined period of time and the code is P0326 and the secondary DTC is a combustion vibration sensor a circuit range performance which affects the powertrain. Also, I have switches with the electrical features in the vehicle as far as the ABS and the steering wheel controls and glitching for the cigarette adapter and plug-in area as well on top of the rear passenger side window, having issues with going up and down.”

“I own a 2012 Hyundai sonata with 114000 miles on it. I have had it since 62000 miles and have replaced a lot of parts to keep it running well. My current issue is the hybrid charging system warning light comes on and the hybrid system will stop working when it does this. It has already left me stuck on the side of the road once. When it did this the car stoped running at a stop sign. Luckily I was able to get car off the road. It shows the pull over hybrid charging system error. So i have tried replacing the battery , replacing the main battery fuse on the 12 volt battery and replacing the orange hybrid battery main fuse. The car still does not function properly and have had it diagnosed with a professional shop and they could not resolve the problem.”

“The contact owns a 2012 Hyundai Sonata. The contact stated that while her daughter was driving at undisclosed speeds, the vehicle was jerking abnormally. The passenger's side front tire was extremely hot. The contact stated that the RPM increased to high, and the vehicle lost motive power while driving. The contact stated that while the accelerator pedal was depressed, the vehicle was slow to respond. There was an abnormal electrical burning odor detected. The vehicle was hard to start. The contact stated that the check engine and ABS warning lights were illuminated. On several occasions, the vehicle was taken to the local dealer, who was unable to retrieve any DTC trouble codes. The bearing was fine but was replaced at the owner's request. The mechanic test-drove the vehicle for five hundred miles but was unable to duplicate the failure. The mechanic informed the contact that the ECM was fried. The ECM was replaced, but no update was provided. Additionally, the mechanic informed the contact that the wiring harness had a short circuit and that the wiring harness needed to be replaced. The vehicle was repaired, but the failure persisted. The manufacturer was…”

“There is a widespread issue with the 2012 Hyundai Sonata hybrid transmissions failing as driver's are driving resulting in extremely dangerous and life threatening situations. It is hazardous for drivers, passengers, and other vehicles on the road. I was driving my 2012 Hyundai Sonata hybrid on an expressway when with zero warning the car stopped driving. I easily could have had a car slam into me from behind at a high rate of speed. This was when the car had 79,672 miles on it. The transmission was replaced by Hyundai under warranty. The second transmission on the vehicle has now failed with only 84,984 miles on that transmission. This time, once again, no warning. No engine lights came on or anything. My car began to stop driving on a main highway with a large line of cars behind me. Once again causing a hazardous dangerous condition for me and others. This time, I was able to get to the side of the road. So not only was I in danger while driving and the car failed with zero warning, I was stranded on the side of the road with my very young child in the car. A transmission failing with zero warning with a mother and young child stranded on the side of the…”

“I was driving. The tailpipes started smoking I checked engine oil and it was almost empty. No check engine light came on. The engine could have locked up on me on a state hwy that has a 60mph limit! No warning light. No low oil light. No lights came on at all ever. The car still doesn't have any light on but has oil consumption like I've never experienced. The engine was replaced in 2019 and only has about 63,000 miles on it.”

“The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that after parking in the driveway and turning the vehicle off, the husband exited the vehicle and walked around to the passenger side. After opening the front passenger-side door, the vehicle erroneously rolled backward down the driveway and crashed into a tree. During the incident, the husband was knocked to the ground and dragged 20 feet down the driveway. During the incident, the husband sustained a head bruise and laceration, an injured leg, and an injured arm. The front passenger also sustained bruised ribs, a head and left knee injury from the vehicle crashing into a tree. Both persons required medical treatment. The cause of the failure was not determined. The vehicle was not repaired. The manufacturer and local dealer were notified of the failure but no assistance was offered. The contact was informed that the vehicle was not included in the NHTSA Campaign Number: 14V434000(Power Train). The failure mileage was 112,000.”