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S60 & V60 '18> / XC60 '17> / S90 & V90 '16> / XC90 '15> General Forum for the SPA-platform 60- and 90-series models |
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2019 V90 Petrol - 'Critical 12 Volt Charging Fault'Views : 979 Replies : 16Users Viewing This Thread : |
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May 25th, 2024, 19:50 | #11 |
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It might be worth doing a reset as per the attached video link, it might work with your problem too, its worth a try and nothing to lose. https://youtu.be/Nkv4hQgDUII?si=yW8KUwd2oiDuLIpj
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XC90 Inscription D5 Power pulse, 2017 MY, Savile grey, Blond Nappa, Leather dash/door tops, Walnut inlays, Dark tinted windows, Air suspension, Bliss/Cross traffic alert, Xenium/7 seat comfort/Family/Winter packs, 4 zone climate, Heated rear seats. |
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May 25th, 2024, 20:07 | #12 |
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Reset
Thanks. My garage have tried resetting any number of times having ascertained the two batteries and alternator are functioning properly, though I'm unsure if they followed the method used in the youtube video.
I'll give it a go when I can as, like you say, I've nothing to loose. No feedback here on the 'switch' that I've come across in an old link so I'll keep digging. |
May 27th, 2024, 15:35 | #13 |
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Reset, possible update on 'switch' and towards a solution!
Reset did not work. Car starts and drives perfectly normally and no hint of going into crawl mode or stopping dead. Message remains there after the initial alert on start-up.
Contacted my nearest Volvo dealership in Stoke-on-Trent and explained all I could. The switch mentioned on this forum could, according to Volvo Stoke, be a BCSM (Battery Control Support Module). They need to undertake an initial diagnosis for £145 (inc VAT) after which they can tell me what is needed and how much it will cost. I'll probably have to bite the bullet but has anyone come across a BCSM? If so can you tell me what it is please? Thanks |
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May 27th, 2024, 16:35 | #14 |
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The BCSM is the module in the attached pic. It's primary function is to control charging and enable the power supply to be divided between the main battery and secondary battery. It can also connect the secondary battery on detection of any voltage drop to ensure no loss of functionality in the car.
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MY17 XC90 D5 Powerpulse Momentum: SENSUS, Osmium Grey, Blond, Walnut, Xenium, BLIS + CTA & RCM, Winter Plus, Fuel-fired Heater, Heated Rear Seats, Power Extensions, Tinted Windows Coming soon: XC60 Ultimate Recharge MY24 |
May 27th, 2024, 19:47 | #15 | |
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Bcsm
Quote:
Is this a 'switch'? Perhaps it is. One of the possible fixes for my ongoing problem of the message not disappearing, seems to be as follows: ....locate the BCM, (battery control module), with a wire going to it. Unplug the wire and leave for a minute or two, then plug back in. Has anyone any experience of doing this? Or should I be cautious of attempting such an approach? I suppose what disconnection then re-connection does is simply interrupt the electrical charge to the Support Battery. I'm just not confident of doing this without someone having done it before or telling me it won't affect anything! Also I thought there were two connections, so which one? Any further help welcomed. |
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May 31st, 2024, 17:38 | #16 |
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Latest update
Car has been with dealership for 'diagnostic assessment'.
Software updated but this was not the solution. Apparently the '12v battery critical charging fault' it is a wiring issue which requires further investigation. The power when the car is running is low somewhere on a set of wiring linkages which cannot be isolated from diagnostics alone. The foot movement sensor under the rear bumper and tyre pressure connections are on the same run as are others on this problematic wiring section. It returns to the dealership next Thursday for (hopefully) a fix, whatever that may be. Last edited by Gozza6; May 31st, 2024 at 20:11. |
Jun 6th, 2024, 17:39 | #17 |
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Final update...dare I say, solution
Hi All
I wanted to let the forum know what's happened so that it might help others with a similar problem. The fault was found to be on the lin network which was dropping and spiking. The BCS Control Module was replaced with a new one and normal readings were showing. So that, in my case, was the problem and a new module the solution. The technician did say that this was an unusual fault for a V90. I paid £113 + VAT for software update and two diagnostic sessions plus £317.50 + VAT for the Control Module. £479.12 in all but worth it for peace of mind as I'm off to Devon for a couple of weeks in two days time. Thanks for your interest and I hope this helps someone else faced with the same problem. Last edited by Gozza6; Jun 6th, 2024 at 17:43. |
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