Two problems related to engine belts and pulleys have been reported for the 2017 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Hyundai Elantra based on all problems reported for the 2017 Elantra.
37k miles. It started with the engine running roughly, so we replaced a coil ourselves. Seemed to fix the issue but a week later there was an intermittent noise from the engine which sounded like a very small exhaust leak (like pffffft). Occasionally, also intermittent, the engine would make a very loud clanky noise. Car shut off without warning while driving <5 mph. Our mechanic said the code was for the 2nd coil, so we replaced all 4 & spark plugs - just to be safe. Two days later, the same noise issues returned and the car shut off twice while driving in a well-trafficked downtown area (5-10 mph). It did not make noise or stall while idling. We had the car towed to the same mechanic, no codes this time. He replicated the issues by letting the car idle for an hour, then driving it 5-10 miles, it made noises and stalled while going up a very slight incline at <5 mph. He said it sounds like something to do with a loss of oil pressure sending the engine out of time, and the loud noise is the crankshaft. I don't know anything about cars and am just repeating what was told to me. At this time he drained some oil and found metal shavings. He said he could look into the problem but he would have to pull the engine and probably take it apart. He didn't want us to waste money trying to diagnose what seems to be a known issue and a blown engine. Also noted that there are few, if any replacement engines out there. In the past few months, I've had a tire sensor malfunction, the radio/media screen go blank multiple times, and the passenger seatbelt notification goes off even when it's just my cell phone and wallet on the seat. All of the electrical issues self-resolved so I didn't even have time to get too annoyed before this major engine failure. Three weeks from the first noise until this point.
1. Low rpm approx 300, rough idle. A/c usage increses the random intermittent occurrence. 40,000 miles when issue was noticed. 2. Relay switch, rapidly turns on and off. Usually at stops and idle. (sound location under hood/ engine compartment. ) 32,000 miles when issues was noticed. 3. Passenger side, front occupant seat sensor. Overly sensative, warning for seat belt when no passenger. Cell phone and or weight less than 5 lbs. 5,000 miles when issued was noticed.