Crankcase (pcv) problems of the 2017 Hyundai Santa Fe

Vehicle: 2017 Hyundai Santa Fe mileage at failure: ~129,000 miles issue type: engine failure / valve / pcv-related defect manufacturer & dealer both denied repair my 2017 Hyundai Santa Fe suffered a sudden engine failure at around 129,000 miles. The Hyundai dealer verbally told me the failure was caused by a faulty pcv valve, which is a known issue in Hyundai engines and can lead to severe oil loss, crankcase pressure problems, and ultimately engine failure. However, the printed diagnostic paperwork they provided listed a different reason for the failure, and the descriptions do not match what I was told verbally. This inconsistency makes me believe the cause is related to a known Hyundai engine defect that the manufacturer is not acknowledging. I contacted Hyundai motor America directly, provided documentation, and requested warranty or goodwill repair assistance. They denied the claim even though the failure was due to a defective engine component and not misuse. This engine failure created a dangerous situation and appears to be consistent with Hyundai’s history of valve, oil system, and internal component defects. Given the mismatch between the verbal explanation and the written diagnosis, I am concerned the dealer and manufacturer are avoiding responsibility for a known defect. I am requesting that NHTSA investigate Hyundai for potential pcv-valve-related engine failures and inconsistent denial practices.

Current mileage: ~94,000 miles ownership: second owner (purchased less than one year old at 17,035 miles) I purchased this vehicle in December 2018 when it had approximately 17,035 miles. Since purchase, the vehicle has been consistently and properly maintained, primarily at authorized Hyundai dealerships, with documented oil and filter changes throughout my ownership. All required Hyundai recalls and updates have been completed. As confirmed by Hyundai service records, my vehicle is eligible for extended warranty protections under the theta ii engine settlement, which explicitly applies to subsequent owners and is not limited to the original purchaser. Engine failure & repair history beginning in mid-2025, my vehicle began to exhibit progressive and excessive oil consumption, despite regular maintenance. Hyundai dealerships performed multiple Hyundai-directed corrective actions, including: pcv valve replacement multiple oil consumption tests combustion chamber cleaning (paid out of pocket after Hyundai motors denied goodwill) these measures failed to resolve the issue. Hyundai’s own oil consumption testing confirmed: 1. 2 quarts consumed, followed by 1. 4 quarts consumed, indicating worsening internal engine failure west houston Hyundai has subsequently advised that engine replacement is required, yet Hyundai motor America has refused coverage, and I was quoted $5,872 for engine replacement and labor at my expense. Engine failure requiring replacement at 94,000 miles is not normal wear and tear and is inconsistent with reasonable consumer expectations or Hyundai’s powertrain representations. Importantly: the vehicle has never been cited for neglect, sludge, or improper maintenance,oil consumption worsened after Hyundai-directed repairs Hyundai has not identified any misuse or disqualifying condition the failure pattern is consistent with known theta ii piston/ring defects.

Excessive oil consumption caused the pcv sensor/actuator (exhaust camshaft timing oil control valve) to fail. While the vehicle is still operable, the failure causes engine timing to change resulting unpredictable losses in power during acceleration, excessive fuel consumption, and incomplete combustion passing through the catalytic convertor posing a risk for future component failure. In the four months that the vehicle is operating in this condition, with its check engine light on, I have had two near collisions while attempting to merge into roundabouts and freeway entry. Fortunately, both were avoided. I no longer attempt freeway entry during rush hour. Two independent service repair shops did a computer diagnostic test and confirmed the problem with the pcv components. They suggested that the excessive oil condition be corrected first. Otherwise, any replacement components will continue to fail. Excessive oil consumption appears to be a chronic problem in the Hyundai 2. 4 l engine. The engine and drivetrain is covered under a 10 year or 100,000 warranty. A year earlier the dealership performed a controlled test when the vehicle only had 60,941 miles, where the initial oil loss was 2. 5 quarts per 1,000 miles. An oil chamber combustion clean, where solvents are used to remove excess carbon was performed. It temporarily reduced the oil consumption to . 7 quarts per 1,000 miles. This is still requiring a replacement of about 2 quarts of oil between routine oil changes in a 5 quart system. The dealership indicated that it passed. About 3 months later the oil consumption increased to 1. 0 quart per 1,000 miles and 8 months later the pcv components failed. If the dealership did the right thing and repaired the engine to eliminate oil consumption, everything would have been fine. I am still trying to get the dealership and Hyundai to honor their warranty. For excess oil consumption. With it the pcv components are also replaced and all is good.

The contact owns a 2017 Hyundai Santa Fe sport. The contact stated when checking his oil he observed that the level was very low. The contact stated that he had noticed that when he was accelerating he would hear an abnormal knocking sound from the engine. The contact stated that he checked the oil and again saw that the level was dangerously low. The contact stated no warning light was illuminated. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the pcv valve needed to be replaced. The vehicle had been repaired, however the heavy oil consumption continued. The contact had an oil consumption test run and was advised that the vehicle was not at the threshold for engine replacement. The vehicle had not been repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 48,000.