*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Electrical system › Instrument panel › Speedometer/odometer
Odometer Fraud. The contact purchased a 2017 Hyundai Santa Fe. It was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of the purchase, the mileage was 45,000. However, when the vehicle was taken to a dealer for a trade-in, it was discovered via a Carfax report that the mileage was over 109,000.
Aug 22, 2026 · 109,000 milesEngine
On [XXX], Laguna Niguel Hyundai performed Service Campaign 9C2 (ECU software update for Theta II emissions improvement, Hyundai TSB 26-01-013H) on my 2017 Hyundai Santa Fe Sport. Immediately after the update, the vehicle developed drivability problems that did not exist before: rough/harsh shifting, hesitation, and loss of power during cold-start operation (the first 1-3 minutes after engine start), plus intermittent infotainment and navigation system failures. Hyundai's own dealer notice dated 05/18/2026 acknowledges vehicles may exhibit 'hesitation or rough shifting' after the 9C2 update and states the matter is 'currently under review' â no permanent fix has been released. The…
May 28, 2026Unknown or other
On XXX, [XXX] Hyundai performed Service Campaign 9C2 (ECU software update for Theta II emissions improvement, Hyundai TSB 26-01-013H) on my 2017 Hyundai Santa Fe Sport. Immediately after the update, the vehicle developed drivability problems that did not exist before: rough/harsh shifting, hesitation, and loss of power during cold-start operation (the first 1-3 minutes after engine start), plus intermittent infotainment and navigation system failures. Hyundai's own dealer notice dated XXX acknowledges vehicles may exhibit 'hesitation or rough shifting' after the 9C2 update and states the matter is 'currently under review' â no permanent fix has been released. The dealership that performed…
May 28, 2026Engine
Was driving down road car went into limp mode about caused a big wreck, check engine was flashing and heard a loud noise as I was trying to get to safety. Had the car scanned and was for code p1326 and looking at all the recalls nothing is for the 2.4l but y'all have been having a lot of issues with these theta 2 engines.
Sep 27, 2026Engine
Immediately following the mandatory Hyundai Servie Campaign Update 9C2-ECU THETA 11my vehicle began exhibiting severe hesitation, very rough idling, jerking at slow speeds and when gear changes, difficulty going up inclines and almost feel at times as though it is about to lose power which poses life threatening situations especially when turning into traffic. I have reported it to the dealers who never once test drove the vehicle but said to me that they did and could find no problem, however they did make me pay for repairs which never fixed the problem. I returned three times with the same issue. They recommended a Fuel Induction Service and a Auto Trans Service. Spark plug change.…
Jun 17, 2026Engine
Component/System Failed: Engine assembly (Theta II 2.4L GDI) and Exhaust/Catalytic Converter. Description: The vehicle suffered a failure associated with the known Theta II engine defects. Engine oil consumption and internal engine wear directly led to unburned fuel and debris entering the exhaust stream, resulting in severe catalytic converter restriction/failure. Safety Risk: The combined failure caused sudden loss of power while driving, engine stalling, and significant driveability hazards, creating an immediate risk of a rear-end collision on public roads. Confirmation & Inspection: The failure was confirmed and diagnosed by a certified service facility. Replaced components and…
Sep 2, 2026Engine
My son was driving the vehicle normally. There were no issues, warning lights, abnormal feel to the drive, and no odd noises. Suddenly, all of the warning lights on the dashboard lit up, acceleration dropped and he could no longer accelerate. He pulled off the main road and there was a burning smell and the vehicle was inoperable.
Sep 11, 2026Engine
Service update 9C2. Car hesitates or slightly bucks on a cold start. No remedy to fix yet.
May 6, 2026
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.