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Fault code P0560 system voltage malfunction

Tiny
TATENDA1234
  • MEMBER
  • 2001 VAUXHALL CORSA
  • 1.8L
  • 4 CYL
  • FWD
  • MANUAL
  • 67,643 MILES
Vauxhall corsa C 2001 fault code P0560 (system voltage malfunction) couple of months ago my battery kept going flat and every time I would charge my battery it would drain after a night, decided to get a new battery and then same thing kept happening and started getting this fault code P0560 system voltage malfunction, so I checked the voltage across the battery and it was high and around 17-19V changed my alternator and auxiliary belt and everything was fine for about a month until I was driving, all the electronics in the car went off including head unit, electronic power steering, speed and rev dials and this happens every time I get to about 3rd gear around 20-30mph
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Sunday, May 25th, 2014 AT 10:45 AM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,644 POSTS
Wow! 17 to 19 volts!!! I'm surprised there wasn't a fire or other damage done to the vehicle. As far as now, is the battery going dead again overnight?

Check this and let me know if you have done any of these tests.

https://www.2carpros.com/articles/car-battery-dead-overnight
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Sunday, May 25th, 2014 AT 4:29 PM
Tiny
TATENDA1234
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After changing the alternator the battery doesn't die anymore, I recently haven't turned my car on for the past 2/3 weeks whilst looking for a solution and a few days ago was the first time since then and it started up fine with no problem. And checked the link you sent and everything in relation is fine. Could it possibly be a bad earth/grounding point?
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Monday, May 26th, 2014 AT 10:43 AM
Tiny
JACOBANDNICKOLAS
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Yes it could be. Can you tell me if the voltage regulator is part of the alt on this vehicle or separate?
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Tuesday, May 27th, 2014 AT 4:56 AM
Tiny
TATENDA1234
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Im not too sure, how would I go about checking?
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Tuesday, May 27th, 2014 AT 12:40 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Most of the time, the regulator is a small electrical box on the rear of the alternator. I wish I could provide more info, but in N. America, we don't have these vehicles or info on them. I am trying to get you through it based on general knowledge.
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Tuesday, May 27th, 2014 AT 6:06 PM
Tiny
TATENDA1234
  • MEMBER
  • 5 POSTS
Oh I checked my old alternator and other forums and apparently it's apart of the alternator itself
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Tuesday, May 27th, 2014 AT 6:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I want you to try this test and let me know what you find.

https://www.2carpros.com/articles/how-to-check-a-car-alternator
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Tuesday, May 27th, 2014 AT 6:50 PM
Tiny
TATENDA1234
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  • 5 POSTS
I checked the voltage again and it was 17 but currently cannot check the amp as my mulitmeter doesn't allow me to, but when I put the fan/AC on max the voltage drops back down to around 13.5 but when I starting driving it works fine but the head unit just cuts out again?
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Sunday, June 1st, 2014 AT 6:22 AM
Tiny
JACOBANDNICKOLAS
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It should never produce 17v of power. That is too high. There has to be a problem with the regulator. The 13.5v with the AC on and the engine running sounds normal.
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Sunday, June 1st, 2014 AT 2:30 PM

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