Many owners had the RDAR update and continue to receive the low battery warning message. It is one issue for some cars but NOT the only issue for all cars, even if it fixed your problem.Strange, I said it in the beginning of this thread but nobody seems to care. Sat-radio. I even send a “lawsuit link”...
When I open the car door it shows in the display. Again when I switch the engine off.When does it come on? Only when sitting with the key on and engine off?
My keys are stored in the house about 40 ft from the car. So I'm thinking that's not the issue in my case anyway.My wife has a 2015.5 XC70 T6 - At 3 years and 35K miles, battery warning showed up while sitting in a parking lot listening to the radio. Car would not start. Waited about 1/2 hour and car started okay. Took it to the dealer a couple of days later and they said the battery was shot, replaced under warranty. I have a 2016 S60 Polestar with 55K miles. I periodically get the warning message, but the car sits for extended periods of time due to weather, (I don't take it out in the snow - wrong tires). I can put the car on a trickle charger for a day or two and then clear the message using the message review and clear function on the turn signal stalk. When car is driven, it is generally for several hours at a time. Dealer has checked the battery and it is good.
I do wonder about having the keys too close to the cars as they are constantly talking to each other and I wonder if that runs down the battery over time. Our keys are about 20 - 25 feet from the cars through two walls.
Well that's a lot of good information. My previous few cars did have an auxiliary battery (though it was in the trunk) so I was wondering about that. I'll check it out. My stop/start has been disabled as long as I've had the car. However I consider this a feature not a bug, which is why I never made a point of it with the dealer. But! Might that be a magic phrase? Because the car is still under factory warranty and that's a malfunction. Hmm.Does the start/stop still function. A computer monitors all voltage in and out of the battery. If the state of charge of the battery is below 80%, start/stop will not work and you will probably get a low battery message.
Not driving long enough per trip will not necessarily drain the battery it just does not have enough time to keep the battery charged above 80%. Volvo batteries do fail. The big battery and the 2nd battery.
Also with start/stop all Volvos have a 2nd smaller helper battery. It is located under the hood cowl, pass side, on S60, behind the front positive jumper location on XC90. The smaller battery should be 12V, tested across the post.
A failed small battery will have 6V or 0V. The failed small battery can also set the message and/or cause start/stop to stop working.
The only way to test the state of charge on both batteries is with VIDA. The Volvo hand held tester will give a state of charge reading as well as other hand held battery testers.
It really does not matter what the Volvo hand held state of charge reads. It is what the CEM reads on the car that determines start/stop and low the battery message.
You can try charging the battery over night or longer and see if the message goes out.
Did you try resetting the BMS with VIDA?2011 XC60 T6. Low battery warning started soon after I bought the vehicle in July 2017. Happened after the tailgate was left open all night (never would have figured that would drain the battery as even my 96 A6 shuts the lights off after a given duration, fixed that on the XC60 by adding a switch next to the tailgate light so I could keep it open at the beach). The XC would not start the next morning, replaced the battery as it seemed tired when tested after a good charge and I didn't know it's history. Since then I have tried several proceedures found in the forum and online to reset the BMS yet the warning will not go away. I can leave the lights on for a day and a half and the thing will crank right up but can't leave the radio on for 2 minutes due to this (foolish?) design. The battery always reads at least 12.6 and I have left a logging voltmeter on it overnight measuring voltage over a series resistor to look for parasitic loads and found none. The battery voltage is rock solid all night.
I then put a battery simulator on it and held it at 13 volts, performed all of the BMS reset proceedures each night and locked the car to hibernate it overnight each time and still, even at 13 volts, the Low Warning still ignites in the morning. Something is wrong with this circuit and it is driving me batty.
What about air conditioning? Where I live it's very hot and humid most of the year. The A/C compressor runs off a belt of course, but does the system also drain the battery? By which I mean interfere with charging, as headlights etc do? Obviously the A/C only works when the car is running, but nothing at all works when the car is not running. I can't even adjust settings without running the engine.My 2005 S60 can be driven during daylight hours with the headlights off. The headlights are a big drain on the charging system. It's nice to have a reliable car with a fully charged battery that starts right up when needed.