I've been a happy owner of a 2.0T M/T 2010 GC for almost 3 months now. Up until tonight, I've had absolutely no issues. Had a weird issue arise on my way home from work tonight...
It was a pretty cold night, around -20 degrees Celsius. Let the car warm up for a couple minutes as I always do, and pulled out of the parking lot with no issues. About halfway through my drive home I noticed a bit of a 'bumping' sensation, kind of felt like I had a flat - but it went away after a minute or so. Then I noticed that my revs weren't really dropping at all when I let off the gas. The first (and only) stoplight I got to, when I shifted to neutral right before stopping, the revs went up to around 3-4k on it's own and wouldn't drop. I was only stopped for a few seconds and was able to pull away fine, but I noticed when I was downshifting for turns, the car seemed to accelerate on it's own, even though I was not on the gas at all..
A little while later as I came to a stop sign, the brake pedal wouldn't go down! It was as if there was something stopping it from depressing any more than a half inch or so. Luckily the roads were dead and I was going fairly slow already, so I was able to make my turn. I put it in neutral and coasted to a stop with the help of the E-brake. While stopped and in neutral, the car started revving by itself. Every couple seconds it would rev up to around 3.5k, drop back down to 1k and repeat.
I shut the car off, waited a minute or so, turned it on and same thing with the revving, even when I put it in gear and held the clutch down. I was about 1km from home at this point, so I managed to get it in second gear and tried to get home. After a few meters, I couldn't give the car any gas. Engine was still running, but pressing the pedal did nothing, CEL went on, then the brake wouldn't work again... Stopped, shut it off and went through the exact same process again. Managed to get it in 3rd gear and got it home. I noticed that the car was making a weird noise every couple seconds... hard to explain it, but sounded like the bass from the stereo, but it was turned off.
CEL light is still on.. Brake pedal seems to work intermittently, whether the engine is on or off, sometimes the brake pedal will depress, sometimes it won't...
Sorry, I know this is long, but I wanted to be detailed.
tl;dr : Car started revving by itself to 3k and back down to 1k every couple seconds. Brake pedal would not depress more than an inch - but would then randomly work after stopping. CEL light came on and car would not respond when giving it gas.. Again, worked for a bit after restarting the engine.
Anyone ever experience anything like this? I'll be calling my local Hyundai dealer tomorrow, but wanted to see if anyone here could shed some light.
