15v high Voltage & 002E97 fault code

J

jonnymac

Member
Hi All
I need a little advice and guidance.

I was driving home yesterday and the battery warning light came on twice in about 5 miles, I drove home (10miles) and put a multi-meter on the car, it read just over 15v at idle on after a longish drive which seemed to high. I connected a small handheld car battery tester directly to the battery and it said the battery was good with a state of health 79%.
I assumed the high voltage output was a faulty alternator and replaced it today and the voltage is currently reading 15.3v at idle on a cold engine. Now im lost as what could be the problem, the cable & connector at the alternator look good as do all the battery connections. I use the car daily and it's not giving any other indicators, slow starting, won't hold a change etc and the battery is still testing good today. Im assuming that the voltage should be 14.8v or less at idle.

E89 3.0 2009
 
jonnymac said:
Hi All
I need a little advice and guidance.

I was driving home yesterday and the battery warning light came on twice in about 5 miles, I drove home (10miles) and put a multi-meter on the car, it read just over 15v at idle on after a longish drive which seemed to high. I connected a small handheld car battery tester directly to the battery and it said the battery was good with a state of health 79%.
I assumed the high voltage output was a faulty alternator and replaced it today and the voltage is currently reading 15.3v at idle on a cold engine. Now im lost as what could be the problem, the cable & connector at the alternator look good as do all the battery connections. I use the car daily and it's not giving any other indicators, slow starting, won't hold a change etc and the battery is still testing good today. Im assuming that the voltage should be 14.8v or less at idle.

E89 3.0 2009
Click to expand...
Is it worth checking your multimeter out on a different car?
No point chasing all sorts of theories if it turns out your kit is out of calibration.
 
Thats was worth a shoot, i plugged in icarly and ran a test through its live data and its sadly showing the same voltage.
 
As far as I know the car can vary the voltage depending on the state of the battery, the z4 is very susceptible to a “dickey” battery, so although it shows 79% it could well be on its way out and the car is trying to rapidly charge it, how old is the battery? I’ve just replaced mine again after 6 years.
 
You might be on to something, i took photos of the battery tester yesterday and its state of charge was 79%, this evening its showing 40% charged, the battery's been disconnected from the car since i removed the old alternator yesterday, that doesn't seem normal at all. I'll replace the battery tomorrow and use carly to register it.
I can't see a date on the battery but i haven't replaced it in the 3+ years ive owned the car.
 
jonnymac said:
Thanks for the advice, a new battery fixed the problem.
Click to expand...

95% of all ‘issues’ on E89s disappear with a new properly registered coded charged battery :thumbsup:
 
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