2017 Hyundai Sonata electrical system problems

Related recalls

• Recall 21V749000Sep 24, 2021469,377 vehicles
  ELECTRICAL SYSTEM:SOFTWARE · EXTERIOR LIGHTING:TURN SIGNAL

  Hyundai Motor America (Hyundai) is recalling certain 2015-2017 Sonata, 2016-2017 Sonata Hybrid, and Sonata Plug-In Hybrid vehicles. The Smart Junction Box (SJB) software logic may not properly interpret the signals received from the multifunction switch, which could cause the turn signal to activate in the opposite direction of what the driver intended.

  Risk: A turn signal that activates in the opposite direction of what was intended by the driver increases the risk of a crash.

  Remedy: Dealers will update the SJB software, free of charge. Owner notification letters were mailed November 19, 2021. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 210.

What owners say

1. Filed Jul 25, 2026TXElectrical SystemSeats & Seat BeltsSteering

   I was driving and all of a sudden the traction lights turned on and the sterring wheel is hard to turn. Almost go in a car accident. The windows just stopped working and the brakes light constantly keep getting burned out.

   NHTSA complaint #11752817 · source
2. Filed Jul 21, 2026TXElectrical SystemEngineFuel, Hybrid & EV Propulsion

   I am writing to report a direct violation of the Theta II Class Action Settlement terms by Hyundai Motor America. This morning , I emailed an Executive Case Manager explicitly explaining that my 2017 Sonata has an active P1326 code, has the 2019 KSDS update, and requires a mandatory diagnostic under NHTSA Recall 17V226 that cannot be denied due to a salvage title. Instead of replying to my facts, the Case Manager Kathy gave me a hard denial falsely framing my federal recall…

   NHTSA complaint #11751813 · source
3. Filed Jun 22, 2026CAElectrical SystemEngineTransmission & Drivetrain

   My 2017 Hyundai Sonata SE, equipped with the Theta II 2.4L GDI engine, is experiencing severe powertrain failures including rhythmic metallic engine knocking, catastrophic oil consumption, and un-commanded surges/jumping in speed while driving. These symptoms manifested following an unauthorized engine replacement performed by Hyundai of El Cajon under Repair Order [XXX], where the dealer covertly outsourced my vehicle to a third-party shop (Legacy Motor Works) to install an…

   NHTSA complaint #11745609 · source
4. Filed May 31, 2026UTElectrical SystemEngineFuel, Hybrid & EV Propulsion

   Supplemental Information to Existing NHTSA Complaint involving a 2017 Hyundai Sonata Plug-in Hybrid (VIN: [XXX] ) While traveling at approximately 70 MPH on a heavily traveled highway, the vehicle suddenly and completely lost propulsion without warning. The vehicle rapidly decelerated in traffic, creating a significant safety hazard for my family and surrounding motorists and requiring emergency maneuvering to reach the shoulder. The vehicle was towed to an authorized…

   NHTSA complaint #11741174 · source
5. Filed May 19, 2026ALElectrical SystemEngineOther / Unknown

   I have a Hyundai Sonata 2017 one year after I bought the car I started having acceleration problems. I have had the throttle changed and the valve gasket cover repaired. On April 15, 2026 the check engine light came on. On April 29th I got theta 2 emissions update installed at Hyundai Auburn, Al. I took it too auto zone the same day the code P1326 was showing up and P0014. On May 5th my car entered limp mode for excessive oil leakage, I got an oil change April 6, 2026. My…

   NHTSA complaint #11738867 · source
6. Filed Feb 20, 2026WAElectrical SystemOther / Unknown

   Here is your updated review with that included: ⸻ I am very disappointed with Hyundai Motor America and the service I received at Hyundai of Renton. I own a 2017 Hyundai Sonata and received a letter about a required software update and ignition cylinder protector due to known theft issues. I went to the Renton dealer for the recall service. They performed the software update and were supposed to install the ignition cylinder protector. Unfortunately, my car was later stolen…

   NHTSA complaint #11719428 · source
7. Filed Feb 6, 2026FLElectrical SystemEngineOther / Unknown

   This car is becoming more of a headache than it’s worth. Turned the car on, My car started shaking and my check engine light came on. then I got this message “A possible condition with your engine control system has been detected on a 2017 Hyundai Sonata”

   NHTSA complaint #11716294 · source
8. Filed Jan 16, 2026ALCrash1 injuredTowedAirbagsBody & StructureElectrical System

   I was involved in a severe motor vehicle collision in a 2017 Hyundai Sonata. The airbags failed to deploy during the crash. I sustained serious injuries and was transported from the scene by EMS. This vehicle has known safety recalls, and I believe the airbag non-deployment may indicate a safety defect.

   NHTSA complaint #11711495 · source
9. Filed Nov 29, 2025TXElectrical SystemEngineTransmission & Drivetrain

   e vehicle is burning approximately 2 quarts of oil every month with no external leaks. This indicates severe internal oil consumption, which is a known defect in Hyundai’s Theta II 2.4 GDI engines. I discovered oil inside the VVT solenoid electrical connector and on other wiring, which shows oil is traveling through the engine harness. This causes hesitation, rough running, and the risk of sudden engine power loss. The vehicle feels unsafe to drive because the oil level…

   NHTSA complaint #11702016 · source
10. Filed Sep 5, 2025NJElectrical SystemEngine

    The camshaft position sensor internal rubber plug is faulty and it allows oil to leak into the sensor housing. Ruining the sensor and the brushes and housing. It causes the check engine light to come on the idle races and car takes off on its own. Can’t drive it because it’s to dangerous. Once it takes off then it goes into limp mode and you can’t pull out because of no power. 40000 miles. The internet is full of owners having the same problem

    NHTSA complaint #11685372 · source
11. Filed Aug 14, 2025TXCrash1 injuredTowedAirbagsElectrical SystemSteering

    Power relay has been replaced several times, air bags did not deploy with either wreck and loss control of steering causing a crash which bent the frame. Hyundai never once contacted me regarding this defective car they replaced motor in because of knock sensor and im lucky to be alive. On one of the accidents in February there was an error message that popped up right before I had the wreck and it was an error message wrong with the cars transmission system or something…

    NHTSA complaint #11680709 · source
12. Filed Jul 31, 2025LAElectrical SystemFuel, Hybrid & EV PropulsionOther / Unknown

    My Hyundai consumes oil and I have to put oil in it every two weeks! Also my ignition coils has had to be changed 4 times. Also check engine light just came on code saying catalytic converter or oxygen sensor changed oxygen sensor a couple months ago. I purchased it brand new and as soon as I got over 100,000 miles nothing has been going good since then please help also my paint on the top of the car is starting to peel. Will never buy a Hyundai again.

    NHTSA complaint #11677661 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology