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 Post subject: Auxiliary battery drain when parked causing EV system Fault
PostPosted: Sat Feb 09, 2019 1:45 pm 
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Joined: Thu Oct 11, 2018 3:01 pm
Posts: 18
Hi guys,

I've got a 64 plate GX4H which I've had since September 2018. It has mostly performed well apart from a phantom drive bettery drain about once a week while parked at work, resulting in the battery level indicator dropping from around 2/3 full to 1/2 full while the car left parked, with a loss of 4-5 miles in range.

However, during the last 2 weeks, this has happened every day. As this was during the recent cold spell, I just put it down to a temperature-related issue, although it was annoying.

Yesterday morning, when I went to do the preheat via the mobile app there was message saying something like it had failed to charge. On checking the car I had an EV System Fault, along with a Brake System Fault and an ASC System Fault.

I called my Mitsubishi dealer, who informed me that the auxiliary battery was probably flat so I put it on charge and went to work.

On returning in the evening the car was completely dead, so I borrowed another charger with a fast charge option and left it charging overnight. I did initially try a trickle charge, but the battery would still discharge despite the charger being connected.

This morning the car had come back to life and had even started charging the drive battery. I noticed that the battery was still not fully charged according to the charger, but the car started up ok so disconnected the battery charger and left it charging the drive batteries.

About 10 minutes later, I was curious to see if the auxiliary battery was being charged from the mains, so I went to open the bonnet only to see the red chaging light on the dashboard rapidly flickering on and off. I tried to start the car but the EV System Fault was back.

I decided I needed to try and confirn if the auxiliary battery was good or not so I disconnected it from the car and took it to be tested by a local garage who confirmed it was good, although the coltage ws a little low. I tested it myself, and found it was around 12.8V and slowly rising when not connected, but only 11.4V when connected to the car. This seemed to indicate the issue was with the car somewhere, so I got it started by connected the fast charger again and drove the 15 miles to the dealership (all on battery).

The dealer hooked it up to the diagnostic machine, but there were no faults stored, and on testing the battery it came back as good (90% capacity remaining) and the voltage was normal. He also put an ammeter in series with the battery and told me it read about 100nA when the car was switched off.

I then got him to hook it up to the charging point, at which point the charge indicator started flickering again and despite disconnecting and reconnecting the chargng cable a dozen times, the car would not charge.

The dealer decided to go and get a torch so we could inspect the pins on the charging port more closely when suddenly we heard the charging station click and it began charging. After this it started charging every time, and after disconnecting and reconnecting the chargng cable another dozen times, we gave up and decided all we could do was monitor the situation to see if the fault returned.

On arriving home, I went to plug the car in and the charging indicator started flickering again. This time it only took one reconnection to get it working though. The voltage across the aux battery seemed ok (about 13.8V I think), although it was slowly falling again, and when I checked the current draw with everthing turned off, I got a reading that fluctuated between 1A and 1.5A. I tried to pull some fuses to see if I could pinpoint what was draining the battery, but the only one that seemed to make a difference was the IOD (Ignition Off Drain?) fuse, and it was getting cold outside so I called the dealer but he was not there, and despite requesting a call back I did not manage to speak to him again.

I let it carry on charging the drive battery until switched off by the timer a 5pm, and plan to let it sit overnight to see if the aux battery is flat in the morning. Out of curiosity I measured the voltage across the aux battery while it was charging the drive battery, and it was around 14.5V so it seems that charging the drive battery also charges the aux battery.

Has anybody else had an issue like this, and if so what was the outcome? Sorry for the long(ish) first post, but I wanted to include as much detail as possible.


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Sat Feb 09, 2019 1:54 pm 
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Joined: Fri May 20, 2016 4:09 pm
Posts: 175
Nope I had two OUTI PHEV in the last 4 hrs


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Sat Feb 09, 2019 2:56 pm 
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Joined: Thu Oct 11, 2018 3:01 pm
Posts: 18
Kesto wrote:
Nope I had two OUTI PHEV in the last 4 hrs


Did you mean years? :)

I just checked again and car is still starting ok. Voltage is ( steady at?) 12.5V and current about 1.8A switched off and not plugged in. Plug it in and I get 14.4V and a current of 5.4A.

Let's see what it's doing in the morning.


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Sat Feb 09, 2019 5:49 pm 
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Joined: Mon Dec 16, 2013 1:18 pm
Posts: 3883
Location: Netherlands
Sounds like a bad connection somewhere. Start by spraying contact spray in the connector holes of the car socket (especially the low voltage "communication" socket) Tighten the 12V battery terminals.

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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Sun Feb 10, 2019 8:17 am 
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Joined: Fri May 20, 2016 4:09 pm
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sorry yrs


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Sun Feb 10, 2019 10:42 am 
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Joined: Thu Oct 11, 2018 3:01 pm
Posts: 18
I have come to the conclusion that jaapv is right and it is a bad connection in the charging port. I noticed that when I plug in the charging cable or enable/disable charging via the app (by setting a timer so that it is not charging and toggling that on/off) I can an instantaneous current drain while the charging circuit initialises the connection.If this were to happen when the charging indicator was flickering on and off I could see how the auxiliary battery could be discharged very quickly. Only issue is I haven't been able to cause the flickering to happen since yeserday afternoon, so I can't test my theory. On the other hand, this is also a good thing ;)

However, I am still getting a 1A drain on the battery when the car is parked, which seems a bit excessive and would result in my auxiliary battery being flat over the course of a weekend if not used.

I will call Mitsubishi tomorrrow and see if the constant 1A current drain is correct.


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Mon Feb 11, 2019 3:16 pm 
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Joined: Sat Jan 05, 2019 3:00 pm
Posts: 6
Any update?
I have the same issue and being fed nonsense by my Mitsubishi dealer stating the 12v battery is not designed to last more than few days unused :o
When I challenged this they tried to tell me that all car batteries are the same and would struggle to start a ICE if left over a week.
It's shocking that they could event make such comments. Do these people think I have never owned other vehicles before and left them parked unused for weeks when not in the country.


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Mon Feb 11, 2019 3:50 pm 
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Joined: Mon Dec 16, 2013 1:18 pm
Posts: 3883
Location: Netherlands
Balderdash. The 12V battery does NOT start the ICE, the generator, fed by the main battery does. Your dealer does not sound very expert. To put it mildly.

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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Tue Feb 12, 2019 1:44 pm 
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Joined: Thu Oct 11, 2018 3:01 pm
Posts: 18
abbs wrote:
Any update?
I have the same issue and being fed nonsense by my Mitsubishi dealer stating the 12v battery is not designed to last more than few days unused :o
When I challenged this they tried to tell me that all car batteries are the same and would struggle to start a ICE if left over a week.
It's shocking that they could event make such comments. Do these people think I have never owned other vehicles before and left them parked unused for weeks when not in the country.


I left my previous car in a car park near Heathrow for a month while I visited family abroad and it started first time on my return.

To answer your question, I don't think the problem is resolved, as the main battery had lost a significant amount of charge while I was at work, about 15% down from when I parked. This meant I didn't make it home on battery, which I am usually able to do.

On getting home, the car was playing up a bit; the interior lights were flickering, and when I switched it back on to check if the charger was connected properly the battery warning light came on.

I just checked it now and there is noticeable difference in the brighness of the interior lights when the drive battery takes over, and the low batteru light stays on every second start. Additionally there is a strange "whining" noise for a few seconds when I either put my foot on the brake or release it. It can't be right and I'm worried about driving it now.

Gonna ring the dealer tomorrow and inisist he takes it in for a few days to diagnose what's going on. If not then I will take it to another dealer. I tried to contact Mitsubishi, but they are totally useless and tried to tell me that the charging timer bug reported in another thread was as designed and I shouldn't expect to be able to both charge and heat my car from the mains using the builtin in features.


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 Post subject: Re: Auxiliary battery drain when parked causing EV system Fa
PostPosted: Wed Feb 13, 2019 11:56 am 
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Joined: Tue Nov 07, 2017 2:50 am
Posts: 69
Location: Swindon,UK
abbs wrote:
Any update?
I have the same issue and being fed nonsense by my Mitsubishi dealer stating the 12v battery is not designed to last more than few days unused :o
When I challenged this they tried to tell me that all car batteries are the same and would struggle to start a ICE if left over a week.
It's shocking that they could event make such comments. Do these people think I have never owned other vehicles before and left them parked unused for weeks when not in the country.
Unbelievable. Please name and shame the dealer.

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