Volvo AWD 850 Forum

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Jump starting 850

posted by  B.B. on  Sat Nov 19 07:10 CST 2011
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last visit: Mon Oct 6 13:15 CST 2014
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Klaus just posted
"Have you jump started the battery lately, before the P0120? It could be a fried ECU/ECM."

How does jump starting destroy electronics?








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Jump starting 850

uid 5322's pic
posted by  alschnertz on  Sat Nov 19 19:31 CST 2011
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last visit: Fri Oct 24 10:32 CST 2014
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I'd assume he meant that reversing the poles on the battery could harm the electronics.








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Jump starting 850

posted by  KlausC on  Sat Nov 19 20:49 CST 2011
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last visit: Fri Oct 24 10:15 CST 2014
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Incorrect jumping and/or overloading the electrical system can screw things up. If the donor car has a bad voltage regulator, it will fry wires and circuits. There are garages that have jumping machines with variable voltage outputs, if the voltage is set too high...

Klaus
--
Did you do your Random Act of Kindness today?








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Jump starting 850

uid 5322's pic
posted by  alschnertz on  Sun Nov 20 05:04 CST 2011
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last visit: Fri Oct 24 10:32 CST 2014
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Good point.
I suppose if you don't know the donor car's status, it's possible, but the donor car may show symptoms too.
Regardless, if you were trying to jump the car in a dark parking lot on a rainy night, it'd be easy to miss.






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