Clock and Trip Computer resets after ignition is turned off

[Aurally]

Hi,

I have had my CPO Ultimate for three weeks now, and observed the following on three separate occasions:

- When I turn off the engine after arriving at the destination, the power cuts off everything in the car. Normally, navigation screen would be on, and music would still be playing, while the front display shows the summary of the last trip. But in this case, none of that happens. Everything goes dead immediately.
- I can immediately push the start/stop switch, and power would be restored. The analog clock will either have stalled (if I don't press the ignition switch), or fast forward to 12 right after power is restored.
- The trip computer data will be gone, as are some other settings, such as instrument illuminating level will revert to default.
- After the head unit reboots, the clock will synchronize to the head unit's time.

I have an ODB reader in the adapter socket, and that LED stays on during this outage, and the battery level stays at 12.5V as far as I can tell.

My questions are:
- Has anybody experienced this?
- I assume the analog clock is tied to the head unit, but what about the trip computer? Do these symptoms point to one isolated module, or are several modules involved?
- How does the logic of the head unit work after ignition switch is pressed off? How does it know to stay on until the doors are opened? Is this done through the CAN bus signaling, or does it have separate 12V pins like most head units, one that is permanently connected to the battery, and one that is switched on through the ignition circuit?

I am trying to determine if this could point to a faulty ignition switch, or is it something more serious? Since it is happening intermittently, I am reluctant to bring it to the dealer only to tell me that nothing is wrong.

 

[darammer]

You said you tested the voltage of the battery with positive results, but I had similar issues on my BMW Motorcycle. The battery tested at 12v but my mechanic told me resetting trip meters, and clock settings were the signs of needing a new battery. I replaced the battery and all those issues went away.

You said its new. Is it new or new to you? If new, I'm sure the battery would be replaced under warranty. If new to you, if Certified, they should replace the battery under warranty as well...

Let us know what happens...

 

[Mark_888]

Has anybody experienced this?

A fair number of people with 2015 G80's have reported weird electrical problems, some like yours. You can search the forum to read about it.

There were a few that got their cars bought back by Hyundai Motor America under the Lemon Laws (varies by state), or at least threat of a Lemon Law lawsuit. Since yours was pre-owned, it is possible that the previous owner had the same problems, and even possible that it was a car they bought back from the original owner because they could not fix the problems you are reporting.

 

[pmckechnie]

Mark, What am I missing or what did I miss? I had a 2016 Hyundai Genesis. I now have a 2018 Genesis G80. They are not the same car. How could I have missed the 2016 G80? There wasn't any at my dealer when I got my 2016.

 

[Mark_888]

Mark, What am I missing or what did I miss? I had a 2016 Hyundai Genesis. I now have a 2018 Genesis G80. They are not the same car. How could I have missed the 2016 G80? There wasn't any at my dealer when I got my 2016.

My mistake. I meant 2015 Hyundai Genesis, not 2015 Genesis G80. G80 started in MY 2017.

Actually, I am not sure what model years were affected, but I do recall reading about some owners of 2015 or later whose electronics shut off while driving, or who had some weird electrical issues affecting the instrument cluster. The details of those reports are somewhere in this forum.

 

[Aurally]

Hi,

Thanks for all the feedback. I found out that the analog clock is tied to the trip computer, and the reason for resetting is a battery problem. In my case, the negative battery terminal was loose. When the engine is turned off, sometimes the wind down is rougher and shakes the car a bit more. In these cases, it would make sense that the vibration causes an intermittent loose connection to open circuit, thereby resetting the trip computer.

However, the reason why the connection is poor is somewhat more interesting, because the nut is as tight it can be. In this design, the nut is located on top of the terminal, holding an angle bracket that maintains the tension of the clamping mechanism. That makes it easy to access, but I cannot see how tightening the nut would also add tension to the clamping.

This is the only image I could find of it, so it must be a Hyundai special:

https://dudazps6njn84.cloudfront.net/00/s/MTIwMFgxNjAw/z/GYUAAOSw-kdXyJSI/$_57.JPG?set_id=8800005007

In the picture, the nut that is under the red colored screw holds the angle bracket, which wraps around the top portion of the clamp mechanism. I had to use a vise grip to pre-tension the clamp before tightening the nut. Hopefully, that will be end of my problems.

 

[trespinosranch]

I have noticed several times on my '16 Genesis Ultimate that the clock has stopped until I start the car again. Never noticed if the whole electronic display also shuts off because I don't pay attention when I'm exiting. But I do see the analog clock rewinding to the correct time after I start the car again.

 

[digmyGenesis]

I have the exact problem (the first post on this forum). I have a 2015 Genesis (which is now G80) Tech Canada. Not sure what to do. The dealer says, they have no diagnostics since only happens intermittent.

 

[theshemp]

I have a 2015 Hyundai Genesis 5.0 purchased new now with 44K miles and have recently started having the same problem as the OP. Push the button to stop the car and everything goes dead. Analog clock spins until 12:00. When I push the start button, the car starts and the clock spins to the correct time. The only other thing I've noticed is that the rear sun shade extends up so I have to lower it.

- This problem first happened twice in a row about a month ago (Nov 2019). It happened once more the next day after multiple times starting/stopping the car trying to duplicate the problem.
- I took it to the dealer (who I don't have a lot of confidence in) who checked the ODB (nothing) and year old battery and connection which were OK. They could not get the problem to reoccur the rest of the day that they had the car.
- I have been driving the car with a couple of more incidents since. Yesterday, it happened 3 times in a row and I haven't driven it since.

Has anyone found a solution to this?
Does Hyundai even acknowledge a problem?

 

[Suburbazine]

I have a 2015 Hyundai Genesis 5.0 purchased new now with 44K miles and have recently started having the same problem as the OP. Push the button to stop the car and everything goes dead. Analog clock spins until 12:00. When I push the start button, the car starts and the clock spins to the correct time. The only other thing I've noticed is that the rear sun shade extends up so I have to lower it.

- This problem first happened twice in a row about a month ago (Nov 2019). It happened once more the next day after multiple times starting/stopping the car trying to duplicate the problem.
- I took it to the dealer (who I don't have a lot of confidence in) who checked the ODB (nothing) and year old battery and connection which were OK. They could not get the problem to reoccur the rest of the day that they had the car.
- I have been driving the car with a couple of more incidents since. Yesterday, it happened 3 times in a row and I haven't driven it since.

Has anyone found a solution to this?
Does Hyundai even acknowledge a problem?

my dealer found no issue when I reported the same problem. I was also getting power steering chatter while turning at low speed.

I took all the connections apart on the battery and cleaned them with a wire brush. Problem persisted.

I took all the power cables off the under hood fuse box and cleaned them. They were shiny on top and shitty in between. No more problems.

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[theshemp]

my dealer found no issue when I reported the same problem. I was also getting power steering chatter while turning at low speed.

I took all the connections apart on the battery and cleaned them with a wire brush. Problem persisted.

I took all the power cables off the under hood fuse box and cleaned them. They were shiny on top and shitty in between. No more problems.

I'll look into that.
Thanks

 

[G-373245]

I'll look into that.
Thanks

Have you had this problem since? Curious to know if this was the fix.

 

[theshemp]

The problem turned out to be a bad battery or bad battery connection.

Back story.
A few months before the problem started I proactively replaced my battery since it was getting near end of life (I travel for work and didn't want to get stranded with a dead battery while out of town). The dealer replaced it and everything was fine for a couple of months when I started getting intermittent electrical problems. Usually it happened when I would park and then push the Stop button and everything would go dead. When I pushed the start button, everything would work and the clock would spin to the correct time.
I took it back to the dealer and they could find no problem (of course).

The problem was happening every few times I drove the car and I was considering selling the car. One time, even the key fob wouldn't unlock the doors in a Lowe's parking lot after I returned from the store. I had to use the little key in the fob to manually open the door.

I brought it to the other Hyundai dealer in Baton Rouge (All Star) and the tech determined that the battery was the wrong type so one of the cables didn't have a good connection explaining the intermittent problem. The original dealer (Ralph Sellers) refused to accept any responsibility.

I ended up buying another new battery and haven't had a problem since. At least I didn't have to buy a new car. I don't go to Ralph Sellers anymore.

 

[ebrown83]

my dealer found no issue when I reported the same problem. I was also getting power steering chatter while turning at low speed.

I took all the connections apart on the battery and cleaned them with a wire brush. Problem persisted.

I took all the power cables off the under hood fuse box and cleaned them. They were shiny on top and shitty in between. No more problems.

Imma try that as well,

 

[Suburbazine]

Imma try that as well,

So I found the issue persisted anyway after this post, it turned out the positive terminal in the battery fusebox wears out and causes intermittent issues. Since replacement of the terminal everything has been fixed.

 

[ebrown83]

So I found the issue persisted anyway after this post, it turned out the positive terminal in the battery fusebox wears out and causes intermittent issues. Since replacement of the terminal everything has been fixed.

Oh wow!! Thanks so much for the quick response and update

 

[ebrown83]

Oh wow!! Thanks so much for the quick response and update

Did you do it yourself or had dealership do it?

 

[Suburbazine]

Did you do it yourself or had dealership do it?

Did it myself. Very easy to take apart the box.