2015 XC60 Brake System Failure + errors + Liftgate malfunctioning

amandamartin · Post by **amandamartin** » 10 Dec 2019, 12:18

Hey! I have a 2015 XC60 T6 with a little under 70k miles on it. Every now and then I will get the following errors while driving. Sometimes they well happen multiple times, sometimes not at all:

Brake System Failure - Stop Safely (this one happens the most often and when it does every warning light on the dash lights up (ABS, Check Engine, Tire Pressure, Seatbelt reminder, Gas, SRS, Brake, ESC, General warning, etc) and the mileage, mph, miles to empty, gph, and temperature also read '---' instead of the actual numbers and the radio, blinkers, and windshield wipers stop working for a period of time. I have tried to shut the car off and restart it when this error happens and the brake locks to where I cannot.
SRS Airbag Service Urgent
Alarm has been triggered
Volvo On Call Deactivated

I just took it in for service and they couldn't get the computer to recognize or read any of these errors. Lately the liftgate has also stopped working intermittently and requires manual opening and shutting (ie. the button doesn't auto close it) as well as making a repeating electronic skipping sound which sounds like it trying to close. Last night this happened for a few hours before stopping. Taking the fuses out did not stop the noise.

Post by **RickHaleParker** » 12 Dec 2019, 16:30

Sounds like a random power interrupt. Check the main power for loose, dirty or shorting connections. It could be as simple as loose battery cables.

amandamartin · Post by **amandamartin** » 16 Dec 2019, 12:26

Battery connections are brand new and seem fine.

PierreC · Post by **PierreC** » 16 Dec 2019, 12:55

I had a whole bunch of seemingly serious warnings and issues ... similar to some of the symptoms experienced by OP. These all disappeared when I replaced the battery. It seems that the Volvo electrical system is very sensitive to stable voltage around 12.8V+