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    1. #1
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      T8 stopped working

      Had the low battery warning off and on over last couple of weeks. Had spoken to dealer about it and was going to schedule it for service, but the battery died completely before I could get around to it.

      The car is just over a month old.

      We got it operational by charging the battery for 20 minutes using jumper leads, and it is now at the dealership.

      Just thought I'd share this in case anyone else thinks the low battery warning isn't urgent.

      I learned a lot over these last few days because of this. When the battery dies these cars are challenging.

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    3. #2
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      I need to add that Volvo On Call service was amazing and patient, and my dealership had me out the door with a loan car in under ten minutes. Great customer service.

    4. #3
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      Good to hear the customer service side was good. Very interested to learn more what caused the low battery message I assume it is the 12V battery.

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    6. #4
      Junior Member VENDELLA's Avatar
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      Quote Originally Posted by bigfoot View Post
      Good to hear the customer service side was good. Very interested to learn more what caused the low battery message I assume it is the 12V battery.
      My i3 did the same thing a few months after owning it. It just failed to start. Apparently, the 12V battery was being drained. Once it was totally discharged, none of the other systems would even start. (Despite having a giant Li Ion battery fully charge). A software update fixed the glitch.

    7. #5
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      Tesla has had a similar issue with some prevalence. The 12V in all these vehicles is still required in order to start the car. As counterintuitive as it seems, the giant Li-ion battery is useless if its little brother dies.

    8. #6
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      And Toyota is no different. At 15 months, the 12v battery on our Camry Hybrid died and nothing would work. I was able to jump it enough to get it to the dealer so they could replace the battery.
      2015 V60 T5 FWD, Platinum, Climate, BLIS
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    9. #7
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      And... The car is back. They upgraded the software on many components and say that it should be fixed now.

    10. #8
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      Thanks for the update. I'm expecting my T8 in May.

    11. #9
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      My wife's T8 wouldn't start the other day, the Dash came alive but didn't show the gear selector, tried an hour later it started with check engine light, then hybrid system failure, let it charge over night and it's been fine, no errors, Although not sure if save mode is working properly it will only charge after the battery is depleted, If I enable it with 3km charge left it will just keep the 3 km charge.

    12. #10
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      My wife experienced the same problem with our T8 last week as derickma described: she turned the "start" button, the dashboard turned on and the Sensus powered up, but the gear selector portion of the screen would not come up. Completely blank. No gear changes were possible and the car was effectively immobile.

      Unfortunately, she was out shopping and parked in the street, which required her to call Volvo On Call and arrange for a tow to the dealership. The tow truck driver attempted to give her a jump, but that did not solve the problem. Once at the dealer, the diagnostics showed that this is a known issue by Volvo. It was not low battery related. There is some sort of a surge that can occur that locks up system (dealer's words). Volvo is apparently working on a software fix supposedly due in a month or two (again, dealer's words). However, in the interim, to remedy the situation, the service tech "rebooted and cleared" the system by pulling out and reinserting Fuse position #11 in the fuse panel under the hood. He told us that if this same situation were to reoccur, we should do the same: remove and reinstall Fuse position #11.

      I'm relieved that there is a solution, and one we can enact ourselves, but I am disappointed at the inelegance of it. Volvo is basically telling us the equivalent of "if you computer is not working, try unplugging it and then plugging it back in".
      Last edited by hyts; 03-30-2016 at 09:07 AM.

    13. #11
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      Update: my T8 was showing low battery charge again. Our new theory is that leaving it charging overnight is actually draining the 12V battery! On Sunday and Monday morning it showed low battery after charging all night. So last night I did not charge it... No low battery warning.

    14. #12
      Junior Member Deman77's Avatar
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      You shouldn't assume it's something hybrid related. Many people experienced issues with battery drain on T6. It can be faulty component or a combination of things causing non-stop drag of current. Things I've see mentioned were retractable tow bar, air suspension, Sensus failing to power down, a loose contact somewhere. There is an old thread on battery issues. Suggest you reach out to people, see what ended up causing it.
      2016 XC90 D5 P* Momentum+ - Ember Black/Amber/LinearWalnut/Charcoal HL, 20" MatteTech - Winter/Xenium/Family/Illumination/7stComfort packs; HUD/4C/Sunroof/FuelHeater.
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    15. #13
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      Quote Originally Posted by hyts View Post
      My wife experienced the same problem with out T8 last week as derickma described: she turned the "start" button, the dashboard turned on and the Sensus powered up, but the gear selector portion of the screen would not come up. Completely blank. No gear changes were possible and the car was effectively immobile.

      Unfortunately, she was out shopping and parked in the street, which required her to call Volvo On Call and arrange for a tow to the dealership. The tow truck driver attempted to give her a jump, but that did not solve the problem. Once at the dealer, the diagnostics showed that this is an known issue by Volvo. It was not low battery related. There is some sort of a surge that can occur that locks up system (dealer's words). Volvo is apparently working on a software fix supposedly due in a month or two (again, dealer's words). However, in the interim, to remedy the situation, the service tech "rebooted and cleared" the system by pulling out and reinserting Fuse #5 in the fuse panel under the hood. He told us that if this same situation were to reoccur, we should do the same: remove and reinstall Fuse #5.

      I'm relieved that there is a solution, and one we can enact ourselves, but I am disappointed at the inelegance of it. Volvo is basically telling us the equivalent of "if you computer is not working, try unplugging it and then plugging it back in".
      So it never happened again, although now it popped up with hybrid failure. I think it has to do with the charging syste. in save mode sometimes the bracket indicating how much it ill save with only cover the remaining battery level even if it's 10% , instead of charging up to 33% it will just keep the 10% ..then other times it will charge to the required 33% like the manual says. I left it at the dealer today to figure it out.

      hyts if you let your battery run down to below 33% when you enter save mode does it always charge it back up to the 33% that it's designed to.?

      It's funny the tech at the dealer wasn't sure exactly how it should work in save mode.

    16. #14
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      Quote Originally Posted by Deman77 View Post
      You shouldn't assume it's something hybrid related. Many people experienced issues with battery drain on T6. It can be faulty component or a combination of things causing non-stop drag of current. Things I've see mentioned were retractable tow bar, air suspension, Sensus failing to power down, a loose contact somewhere. There is an old thread on battery issues. Suggest you reach out to people, see what ended up causing it.
      The dealer had it overnight monitoring battery drain. There was none.

      I took it home and left it charging overnight and the next morning I had a low battery warning.

      Right now, things point to the recharging system. It is at the dealership tonight so they can measure battery levels overnight while it is charging. Then we will know.

    17. #15
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      When you say "Battery" are you referring to the battery which starts the vehicle or the one which is for the Hybrid system ?

    18. #16
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      Quote Originally Posted by moliver2k9 View Post
      When you say "Battery" are you referring to the battery which starts the vehicle or the one which is for the Hybrid system ?
      12V battery drains. Hybrid battery is fine.

    19. #17
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      derickma - I don't have a good answer for you. We drive almost exclusively in the city (all short-haul, stop and go), about 10-20 miles cumulative per day, and keep it in Hybrid mode 100% of the time. I can try running the hybrid battery down and then switching to Save mode to see what happens and report back to you.

    20. #18
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      Quote Originally Posted by hyts View Post
      derickma - I don't have a good answer for you. We drive almost exclusively in the city (all short-haul, stop and go), about 10-20 miles cumulative per day, and keep it in Hybrid mode 100% of the time. I can try running the hybrid battery down and then switching to Save mode to see what happens and report back to you.
      If you don't mind that would be great, the manual states that if the charge is below 33% it will engage the generator and charge while driving until it gets to 33%. Mine will do that sometimes, usually it will just hold the battery charge even if it's below the 33% and not increase the charge while driving.

    21. #19
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      To wrap this up, the problem ended up being the tailgate sensor that detects when you wave your foot. Apparently it is highly sensitive to certain radio frequencies in my neighborhood and was waking up the car every few seconds all night long. The solution for now was to disable the sensor via its fuse. The car has had no battery issues for a few months now.

    22. #20
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      Quote Originally Posted by ntt.ntt View Post
      To wrap this up, the problem ended up being the tailgate sensor that detects when you wave your foot. Apparently it is highly sensitive to certain radio frequencies in my neighborhood and was waking up the car every few seconds all night long. The solution for now was to disable the sensor via its fuse. The car has had no battery issues for a few months now.
      That is interesting, I hope there are no local signals that can unlock your car and allow someone to drive it away.
      MY17 XC90 D5 Inscription, Polestar, Osmium Grey, Blond Nappa, Walnut, Xenium, Winter with HUD, Auxiliary Heater, Homelink, Heated Rear Seats, Subwoofer, Android Auto & Apple Car Play, Tinted Windows

    23. #21
      Junior Member Luxobarge's Avatar
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      Quote Originally Posted by ntt.ntt View Post
      To wrap this up, the problem ended up being the tailgate sensor that detects when you wave your foot. Apparently it is highly sensitive to certain radio frequencies in my neighborhood and was waking up the car every few seconds all night long. The solution for now was to disable the sensor via its fuse. The car has had no battery issues for a few months now.

      Thank you for taking the time to post an update.

      2016 Volvo XC90 T6 Inscription, Savile Grey, B&W, Vision, Convenience, HUD, 4C Air Suspension, PA-II, Pole✦

    24. #22
      Junior Member Purpleorchid's Avatar
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      Quote Originally Posted by ntt.ntt View Post
      To wrap this up, the problem ended up being the tailgate sensor that detects when you wave your foot. Apparently it is highly sensitive to certain radio frequencies in my neighborhood and was waking up the car every few seconds all night long. The solution for now was to disable the sensor via its fuse. The car has had no battery issues for a few months now.
      Interesting. How did you figure that out?
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    25. #23
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      Quote Originally Posted by ntt.ntt View Post
      To wrap this up, the problem ended up being the tailgate sensor that detects when you wave your foot. Apparently it is highly sensitive to certain radio frequencies in my neighborhood and was waking up the car every few seconds all night long. The solution for now was to disable the sensor via its fuse. The car has had no battery issues for a few months now.

      Your car is famous. Our FTS (Field Technical Specialist) told us about this car. I'm sure it sucked for you but it was fascinating hearing about this.
      2007 S40 T5

    26. #24
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      Same Problem ?

      Quote Originally Posted by qaz996 View Post
      Your car is famous. Our FTS (Field Technical Specialist) told us about this car. I'm sure it sucked for you but it was fascinating hearing about this.
      my brand new custom built T 8 had the same problem and starter battery died without warning while plugged in-which does according to the manual also charge with the hybrid battery .
      Initially thought to be a faulty battery but there was a persistent overnight battery draw .
      Have informed dealership about this rear bumper sensor issue and thanks for posting the details .
      The fault with me vehicle has not yet been devolved

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