No Power at all - 2018 Honda Clarity Forum
  • 1 Post By 4sallypat
Thread Tools
post #1 of 3 (permalink) Old 04-24-2020, 01:29 AM Thread Starter
Junior Member
Join Date: Apr 2020
Posts: 2
No Power at all

I walked over to the car this morning after with the key in my hand, tapped the door handle and nothing... tapped again, nothing. Finally manually unlocked the car an there is no power at all. No dome light, can't even unlock the charge port door.
The car has been sitting unused in the garage for 2 weeks. I have no idea what is going on. Should I try to jump it or charge the 12 volt battery?
I manually opened the charge port and plugged it in but it won't charge without the 12 volt powering the computer to regulate I guess.
I guess I May have to call Honda service but they have been generally clueless about either of my Claritys.
kjohler is offline  
post #2 of 3 (permalink) Old 04-24-2020, 11:38 AM
Super Moderator
4sallypat's Avatar
Join Date: Jan 2019
Location: Southern California
Posts: 407
You should contact the Honda roadside emergency number and have them tow it to the dealership.
obermd likes this.
4sallypat is offline  
post #3 of 3 (permalink) Old 04-25-2020, 01:24 AM
Senior Member
Join Date: May 2019
Location: Atlanta, GA
Posts: 445
Most likely a jump start will get it started, either with booster cables or with one of those paperback-sized portable jump start batteries, which actually work really well especially on hybrids because cars like Clarity the 12V battery is used only to get the electrical system running and then the much larger HV battery takes over.

Once the car is on (make sure READY appears on the display) then the HV battery will immediately begin charging the 12V. Unlike a gasoline car where you would then need to drive the car for an hour or so to get the battery charged, with the Clarity you can just leave it sitting in the garage turned on (again make sure it says READY) and it will just sit there quietly charging the 12V battery. Of course check to make sure that your EV range is above 0. I'm not sure how long it takes to fully charge the 12V from fully depleted, but I would think leaving the car on in READY mode for at least thirty minutes will give it enough of a charge so that it will start the car without a jump, assuming that the next place you drive it to will be the dealer. If however you plan on first taking it to the grocery store or wherever then I would let it sit in READY mode for at least an hour to try and get the 12V more fully charged. And even then you will want to bring a portable jump start battery with you since the overall condition of the 12V battery is unknown at this time. But to be even safer the next trip should be straight to the dealer. Assuming that it jump starts there is no real need to have it towed to the dealer unless you just feel more comfortable doing that, especially if they do it for free under roadside assistance.

The dealer can check for codes to determine if there are any other underlying problems but assuming you are able to jump start it then the odds are that this was simply a case of a less than fully healthy 12V battery that drained after two weeks of sitting. The dealer will hopefully replace the battery for free under warranty as two weeks of sitting is a bit too short of a time period for a 12V battery to fully deplete especially for a car that is new. Unless there were any add-on accessories like a dash cam that were draining it. That being said a dead 12V battery after the car sits for two weeks is not unusual for Clarity, but not because the batteries are necessarily inferior but because many of our cars sat for a long time on dealer lots without being charged, which shortens the life of the battery.

Hopefully the dealer will replace the battery for free under warranty but that's up to them to decide. If they won't do it under warranty and you are hesitant to buy a new battery at this time, especially at dealer prices, then at least go to an auto parts store and have them test the 12V battery. If they say it needs replacement then at least their price will likely be a bit less than the dealer. If however you aren't that concerned about the cost then it will certainly be easier to just have the dealer replace it while you are there. Either way I wouldn't recommend going too much longer with this battery because once a 12V battery has been fully depleted even just once its days are numbered. Some might last another year or so after just one full depletion, but this battery already has exhibited that it's probably somewhat worn out, and again this may not be the first time it was fully depleted, no way to really know. We're coming into warmer weather now so it might make it through the summer but the risk goes up if you try and take this battery through next winter. Some people have reported that their Clarity can get fussy when the 12V battery is not working right so that's why it's probably better to just bite the bullet and plan to get a new battery now instead of trying to drag this one out any longer. Obviously if the dealer will replace it for free that becomes a moot point.

Looking ahead to when your car is back in the garage with a new battery, you will want to maintain the health of your new battery if the car will continue to sit for long periods. You can get a battery maintainer, which are a modern and much better version of the old trickle chargers. A popular brand is Battery Tender. Some people just leave the maintainer plugged in all the time as they have circuits to prevent overcharging, but it's safer to just use the maintainer every few days, i.e. connect the maintainer until it indicates that the 12V is fully charged then disconnect the maintainer. Alternatively you can simply turn on the car for about thirty minutes every few days or once a week or whatever (again make sure it says READY). Note that just having the EVSE charger plugged in won't by itself keep the 12V battery charged, as it only charges the 12V while it is charging the HV battery. And even then the charge rate for the 12V battery is much lower than when the car is in READY mode.

Last edited by 2002; 04-25-2020 at 01:35 PM.
2002 is online now  

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Related Threads
Thread Thread Starter Forum Replies Last Post
Charging and Home Power bill Paul92203 Charging and Batteries 26 02-02-2020 11:39 PM
Power for Radio Not Working dwheat17 Honda Clarity Plug-In Hybrid 2 09-23-2019 02:53 PM
Test driving today blastfurnace Honda Clarity Plug-In Hybrid 26 06-17-2019 09:58 AM
Audio upgrades - story and a question [email protected] Engine And Technical Discussions 2 11-27-2018 12:12 PM
2018 Honda Clarity Overview Administrator 2018+ Honda Clarity News 0 05-30-2018 08:20 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome