Spontaneous wave of faults; Unsafe to drive

[JamieTucsonUlt]

Car: Tucson 1.6 TGDi Hybrid 230 Ultimate 5dr 2WD Auto Hybrid Estate

Last year as I was driving, a load of sensor failures appeared on the dash:
- Driver Attention Warning System (DAW)
- High Bean Assist System (HBA)
- Speed Limit Warning (SLW)
- Lane Keep Assist (LKA)
- Smart Key System
- Blind Spot Assist
Plus another 4/5 systems.

During this time the indicators (Hazards still worked), windscreen wipers and other essential elements failed to work. After driving home using arm signals (!), I left the car overnight and then problem was gone.

Last night it happened again while driving, I continued to drive and 15 minutes later the faults slowly corrected themselves.

The first time it was a very sunny and clear day, last night was typical UK miserable weather.

Has this happened to anyone else? What do you think the issue could be? Faulty fuse? Something shorting the system?
I find it mental that these systems cause the indicators to not function. Both times I was on dual carriageway/Motorway. Puts me in a very unsafe position.

I tried googling the problem and found an American Tucson Forum site which had a similar post. They took their car into the dealership but they couldn't replicate the problem and therefore couldn't diagnose the problem.

[pharaoh]

First of all, are you in the UK ? I ask because we don't call the Tucson an estate over here.
On a modern car such as the Tucson that is full of electronic/computer controls, there could be any amount of things causing your problem - possibly something as simple as a loose connection somewhere.
Since the first occurence, have you taken the car to a dealer so they could interrogate the system to see if any fault codes were showing ?
If it happens again, try and pull into a safe place and call out the AA using your free breakdown service. Lay it on a bit thick and tell them the car is dangerous to drive and that you're frightened. Hopefully this will get them to you quickly and the faults will still be showing. They should have equipment in their van that will be able to read any fault codes if there are any showing. Probably better to leave the ignition on whilst waiting for them to arrive, as switching it off and on again could well act as a reset, as on a computer. Even if there are no fault codes showing, it will be beneficial if they can witness the Xmas tree lights on your dash.

[JamieTucsonUlt]

First of all, are you in the UK ? I ask because we don't call the Tucson an estate over here.
On a modern car such as the Tucson that is full of electronic/computer controls, there could be any amount of things causing your problem - possibly something as simple as a loose connection somewhere.
Since the first occurence, have you taken the car to a dealer so they could interrogate the system to see if any fault codes were showing ?
If it happens again, try and pull into a safe place and call out the AA using your free breakdown service. Lay it on a bit thick and tell them the car is dangerous to drive and that you're frightened. Hopefully this will get them to you quickly and the faults will still be showing. They should have equipment in their van that will be able to read any fault codes if there are any showing. Probably better to leave the ignition on whilst waiting for them to arrive, as switching it off and on again could well act as a reset, as on a computer. Even if there are no fault codes showing, it will be beneficial if they can witness the Xmas tree lights on your dash.

Yes I am in the UK. I just copied the model name from my documents sent from Hyundai when I purchased the vehicle.
Between the 2 occurrences, I have taken the car in for a service and told them about the issue. They said they couldn't see anything untoward.
I think I will take your advice and do that. Although I do not have the time to wait 4/5 hours for AA to arrive.

[alan sh]

I vaguely remember something like this before and it turned out to be a loose connector somewhere in the system.

Alan

[pharaoh]

They said they couldn't see anything untoward.

Unfortunately dealers are not created equal. Likely there were no fault codes showing on your car when in for service and the dealer just left it at that. Some other dealers will go the extra mile to try and solve your problem, especially as it puts you in a potentially dangerous situation. This is why it's a good idea that the AA or a dealer sees the car when the faults are lit up.

Although I do not have the time to wait 4/5 hours for AA to arrive.

Who does, but hopefully it would be quicker if you lay it on and frankly I'd rather wait for them to turn up and maybe get a fix, rather than just driving away and wait for it to happen again.
You could in the interim try a hard reset on the infotainment screen. There is a small hole at the bottom left of the screen into which something like a paper clip can be inserted. Push the clip in for a second or two for a quick reset and for a full reset, push in and hold for a mnimum of 5 secs. You will probably lose some of your personal settings in a hard reset, but no harm will occur and you can easily re-enter those settings.
I've had a not dissimilar situation to yours on another make of car. Dealer checked for loose connections (none found) and did a hard reset after which I no recurrences. It may not work, but it costs nothing and is worth atry.

[EJH]

You've got images to prove a fault existed. No dealer can fob you off with a shrug of the shoulders. If your dealer does, call Hyundai directly and demand a full analysis of your car.
A relatively new car, under warranty that can't wipe a windscreen in the UK is a dangerous weapon!
Good luck

[David3]

Not had this Happen on our Tucson but had a similar thing on our Ford Edge and my father in-law more recently on his GLC Mercedes, in both cases it was due to a voltage drop in the battery, mainly due to short journeys but with a lot of things turned on

[JamieTucsonUlt]

Since my post the problem is occurring every 30 seconds in the car. Faults come on, faults go off. Constant beeping. I think it does sound like a loose wire somewhere or potentially a loose fuse(?).

Optimistic question: does anyone know where the loose wire could be? or know whether it could be a lose fuse? or what fuse the systems run on?

I don't think it would be a drop in voltage due to short journeys as I do around 1500 miles a month on motorways in my car.

[roadster]

I believe this is a hybrid with a lithium 12 volt system? If so that would be the first item to come under suspicion but the cars ODI diagnostics should give some indication. If not constant voltage monitoring using a recording multimeter could show something happening. These meters typically have a USB output to a laptop or similar. If this fault is repeatable I would be surprised if technicians couldn't track it down.

[alan sh]

Since my post the problem is occurring every 30 seconds in the car. Faults come on, faults go off. Constant beeping. I think it does sound like a loose wire somewhere or potentially a loose fuse(?).

Optimistic question: does anyone know where the loose wire could be? or know whether it could be a lose fuse? or what fuse the systems run on?

I don't think it would be a drop in voltage due to short journeys as I do around 1500 miles a month on motorways in my car.

sorry, I can't remember. I don;t think it was a fuse.

Alan