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Sporadic failure to complete start cycle

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Old Jun 3rd, 2021, 20:06   #1
rico05
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Last Online: Jun 3rd, 2021 20:06
Join Date: Apr 2021
Location: Cardiff
Default Sporadic failure to complete start cycle

Hi all, now and then my 2012 V40 D4 fails to start. It tries to turn over (video linked: https://photos.app.goo.gl/8Z6ZU526d2KC4Pqx7), then gives up the ghost. Sometimes I have to repeat the start cycle several times before it starts. And sometimes it's fine! Rolling the car with my foot off of the clutch, in third, doesn't help, so I doubt it's a sticky starter motor. Any ideas?

I also get the fault code B110B77, which is to do with connection to a rear door locking motor. Haven't had any problems with the rear doors locking or unlocking... But this leads me to think that it might be something electrical. Battery is well connected, main earth to car is solid and in good condition. Fuses all plugged in tight. Could it be an earth in the rear door or something?

Thanks for any ideas!
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Old Jun 4th, 2021, 10:23   #2
JonnyA
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This sounds quite similar to an issue we had with ours a couple of years ago ..it was randomly taking 2 - 3 presses on the start button to fire up.
we also had the stop/start system not enabling.

The resolution for us was a new battery as it was on its way out and not holding sufficient charge.
I suggest checking the battery or giving it a good charge.
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ex - 1988 740 GL estate, before that a 340 GL
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