Hi, new member here, located in UK. I have had my CX60 since September. Mainly short local journeys in EV mode. Warning has appeared on dash telling me that the 12v battery is low, and to start the engine. I have done about 40 miles on engine only, but warning still appears with annoying sound that continues for 30 seconds. I connected a battery charger, and left it overnight, for two nights running. Warning still appearing. Help!
12v battery
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Willdu
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On another forum, it has been suggested that problem is with the smaller backup battery, not the main battery. This was confirmed in a conversation with the service manager at my dealer.
The voltage measurements mentioned above only relate to the main battery.
The voltage measurements mentioned above only relate to the main battery.
Sorry, do you mean the battery that is located on the passenger side just underneath the windscreen? If so, that is the one I thought was the problem. When you say main battery, do you mean the one that actually drives the wheels!?
The Cx60 has two 12v batteries, one small one as you mentioned and a normal AGM 12v battery.
The mild-hybrid battery is 48v, the PHEV battery is 355v.
Thanks. Where is this AGM 12v located?
There are, as far as I’ve learned 3 batteries.
A 355v battery for driving the wheels
A 60Ah 12v battery, located under the cover in the engine compartment, near side in a RHD model
A 6.3Ah 12v backup battery located somewhere accessible from inside the car. This is the one that’s apparently the problem.
That’s why measuring the main 12v battery shows good voltage and charging up doesn’t fix the problem.
Thanks, I will go hunting before Tuesday, when it goes in.
If you find out where it is, let me know please?
Strangely enough, I’ve now had 5 journeys without warning, using ash59 method.
Thanks - Edited my post.
Steve. I found something under the drivers seat, towards the front. Black plastic cover. Holes in part of it with what looks like a heat sink inside. Two button looking objects on it. Thought I could remove the cover somehow, but didn't want to damage anything. Possibly have to lever off the buttons maybe. Could this be the elusive battery?
I'd be surprised if it was - typically batteries don't need a heatsink - Amplifier for the sound system perhaps...
Joined
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78 Posts
If it is about the message with the 12v battery, that the engine must be left on..., I reported the error to the service and they changed my 12v battery. Case solved.
It gets more baffling. Spoke to the technician he says there are only 2 batteries fitted. The large drive one, and a normal 12v. If there is another one, it beats me where it could be. Attachment below on what they carried out. Any further problems they will have it for a couple of days.
Attachments
When did you get the battery changed and has it cured the problem permanently?
My CX60 is at the dealers for the second time with this problem....
I had my car in the dealers a few weeks ago. They didn't replace the battery, but reset various settings. No problems since.
Joined
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78 Posts
Yes, I haven't had any errors and there were temperatures of -9 degrees C.
Hi All.
New member from UK here.
Just took delivery of the CX-60 diesel.
Maybe dealer wanted to give me the car quickly and the PDI was not performed as it should.
From delivery until now each time I unlock the car or switch it off I have this 12V battery warning.
I have driven over 200 miles now (one trip was nearly 2 hours) so the battery should have been recharged by then. Unfortunately it's not a case with me.
Car is going back to the dealer and hope they will be able to resolve this and few other issues.
![Image]()
![Image]()
New member from UK here.
Just took delivery of the CX-60 diesel.
Maybe dealer wanted to give me the car quickly and the PDI was not performed as it should.
From delivery until now each time I unlock the car or switch it off I have this 12V battery warning.
I have driven over 200 miles now (one trip was nearly 2 hours) so the battery should have been recharged by then. Unfortunately it's not a case with me.
Car is going back to the dealer and hope they will be able to resolve this and few other issues.
21 - 40 of 87 Posts
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