2017 Hyundai Santa Fe: complete transmission failure

Filed Aug 12, 2026 · Engine, Fuel system · TX

Complete unmitigated loss of acceleration and power while traveling at highway speeds, creating an immediate life-threatening road hazard. Following a warranty engine replacement and mandatory dealer software flash at Clay Cooley Hyundai (Sherman, TX), the vehicle began experiencing powertrain communication issues. While operating the vehicle at 65 MPH on the highway, the vehicle completely failed to accelerate and lost propulsion power, nearly resulting in a catastrophic rear-end collision with an oncoming 18-wheeler semi-truck. Dealership diagnostics claim "no trouble codes present," but live data telemetry confirms the High-Pressure Fuel Pump (HPFP) is actively commanding and delivering a dangerous 1,600 PSI to the fuel rail at hot idle. This abnormal fuel delivery is paired with a severe powertrain stutter in 3rd gear. Service personnel at multiple locations confirm a widespread, high volume of transmission failures and severe drivability issues specifically tied to this recent Hyundai software update. Corporate has denied repair coverage. The vehicle remains an active highway safety hazard and is completely undrivable.

Filed Aug 7, 2026 · Transmission · IA

The 2017 Hyundai Santa Fe was brought to dealership on 3/27/26 for an oil change and a computer update was completed for Emissions Improvement. Upon picking the vehicle up after service, it was noticeable that it was not shifting correctly. I spoke to the service department and asked if the memory was cleared with the update an if it was having to relearn how I drive and the said it should not be affected. This went on for a few days and I left the car with them to duplicate as there were3 no stored codes. After a few weeks, the Teck Line recommended a new transmission, which Hyundai offered goodwill assistance. As we were waiting for the transmission to arrive from being on backorder, a bulletin for Service Campaign 9C2 was release on 5/18/26 that described my experience with shifting issue almost exactly. The transmission was replaced and the drivability issues still persist. Hyundai says that I must let my car warm up for 1-3 minutes to allow a catalyst to reach temperature and not cause rough shifting. This rough shifting is the effect of the update and thus te reason that my transmission needed to be replaced. Further investigation showed that this update is a known issue and cannot be reversed once installed. Currently, I must start my car in 90 degree weather to warm it up as a result of this update which is not logical in any thought process. I have asked Hyundai to cover the balance of the new transmission as this is a result of thier faulty software update with no success.

Filed Aug 4, 2025 · Engine, Transmission · CO

This vehicle has experienced numerous serious failures, including two engine replacements, a transmission replacement, and persistent safety system malfunctions. The Downhill Brake Control (DBC) system remains stuck in the "on" position, and the traction control warning light stays illuminated. These issues directly compromise vehicle safety and stability, particularly on hilly or wet roads. Despite extensive service at Arapahoe Hyundai in Centennial, CO, these problems continue to return. The vehicle has been in the shop multiple times and was most recently in service for nearly 30 days. My wife was stranded at the dealership today due to the same unresolved safety system failure. Dealer communication has been poor, and repairs are often incomplete, requiring immediate return visits. The repeated failure of safety-critical systems, combined with the inability to resolve the issues long-term, presents a significant safety concern for both my family and others on the road. I am requesting the federal safety agency to investigate whether this is part of a broader defect pattern affecting 2017 Hyundai Santa Fe models and if a recall is warranted.

Filed Jul 21, 2023 · Engine · AR

At 80,000 miles, transmission went out. Then, 91,000 miles the motor locked up. Hyundai refuses to repair

Filed Oct 2, 2020 · Acceleration, Fuel system · ID

During acceleration from a stop sign/red light or turning the engine hesitates for approximately 5 seconds after several tries before reaching desired speed. When using cruise control on freeways there is a 10 to 15 second delay when accelerating or passing another vehicle which in one instance caused a near accident on a high speed freeway. My vehicle slowed down causing other vehicles go around me passing from the right side lane. These hesitations have caused me several near accidents and makes me not feel confident when driving this car. I have taken the vehicle to the dealership on many occasions and they report no error codes show up and, the mechanic cannot duplicate the problem. However, the dealer replaced the transmission earlier this year. There has been no improvement. I have reviewed many other complaints of this hesitation problem. Will it take death reports to help us owners? My issue began in 2018 right after purchase and the problem is occurring more often now. No help is in sight when hyundai and the dealership refuses to admit the problem and makes me and other owners feel like we don't know our vehicles or our own minds!! We need help before a death occurs not after!!

Filed Nov 3, 2016 · Transmission · 356 miles · IL

I have been experiencing intermittent hesitation with acceleration (especially when resuming speed after slowing down). I have taken car back to dealership 3 times. They performed a computer update to "relearn my driving style" and then they replaced the transmission. Nothing has helped. I had the tech test-drive with me. He felt there was a shift-lag from 3-2, but said it was normal. I'm told nothing else can be done until a recall is issued. I've had my car 2 months (4000 miles) and it has never driven right since I brought it home.