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post #1 of 11 Old 26th June 2019, 10:26 AM Thread Starter
AlexDoran
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Christmas Tree, CIC / HUD / Speedo Cutting Out.

Hi guys, was wondering if you might be able to help me diagnose my situation, bit of background:

- Was on holiday for a week.
- Came back, started the M5, let it warm for a few mins, then jumped my bro's Discovery.
- Drove home from my Dad's approx 5 miles and switched engine off.
- Next day i took the wife for some food, had a good run down the motorway and gave it some stick. As we got off the motorway i noticed the HUD kept cutting out, then the CIC, then was getting a LOT of error messages, Transmission, DSC, Assisted Start, ABS, Tyre Pressure etc etc
- Turned it off and ate my food with anxiety
- Got back in the car, started fine, would not go into R had to go D first then R and it took.
- Did the same thing until about half way back down the motorway, when it started to behave properly again.

Plugged in INPA when i got in and there was a lot of errors on many modules, mostly related to Over / Under Voltage, reading online straight away i got to voltage regulator.

Checked with a meter before work, i had 11.9v - 12.2v on the battery when off, 14.1v when idling.

Driving to work i had 14.1v On the Battery and 14.5v On the Generator Voltage (if thats the right thing to be measuring?) It wasn't erratic up and down like other regulator posts i have seen.

https://ibb.co/Dw5TQDv

Any help would be appreciated in identifying where to start before i start buying batteries / regulators / alternators.

Thanks

Alex

Last edited by AlexDoran; 26th June 2019 at 10:29 AM.
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post #2 of 11 Old 26th June 2019, 01:03 PM
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Since it sat for a week, I'd clear the codes and not worry about it unless it happens again or you get the high drain message.

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post #3 of 11 Old 26th June 2019, 03:02 PM
horse86
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would bet your voltage regulator is on its way out. Had crazy symptoms errors like that too. Just replaced with a new Valeo alternator (comes with new voltage reg) while I was in there.


Keep an eye on your battery as well....this can toast your battery if not rectified.

- Justin

/// 2008 Space Grey M5 (SMG)
2009 Triumph Speed Triple 1050
2008 Range Rover FullFat

Last edited by horse86; 26th June 2019 at 03:03 PM.
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post #4 of 11 Old 26th June 2019, 05:04 PM Thread Starter
AlexDoran
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Could this only happen under hard load? Appeared to be fine the whole drive to work.
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post #5 of 11 Old 26th June 2019, 05:26 PM
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hard load engine wise or electrical wise? It's not unlikely. These cars have a ton of gizmos that need proper voltage to function properly and under hard load would require more voltage. Try turning all your lights on, radio on, AC on max, etc. See if the car starts going bonkers.

- Justin

/// 2008 Space Grey M5 (SMG)
2009 Triumph Speed Triple 1050
2008 Range Rover FullFat

Last edited by horse86; 26th June 2019 at 05:27 PM.
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post #6 of 11 Old 26th June 2019, 06:54 PM Thread Starter
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Well took the long way home and did a couple of high rev pulls in 2,3,4 and straight away the HUD was flickering off and on and also music cutting in and out. I eased off at that point, didnt have the laptop running INPA unfortunately so i cant tell if it was over or under volts. Need to get Rheinhold installed so i can get some translated codes out, i ordered a battery as it was half price sale, going to order a regulator too and go from there. Dont want to risk damaging anything else if its sending too much voltage.
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post #7 of 11 Old 26th June 2019, 08:56 PM
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depending on mileage maybe should have just got a new alt (comes with new VR)...you're going to be in there anyway. Would suck to do it twice.

- Justin

/// 2008 Space Grey M5 (SMG)
2009 Triumph Speed Triple 1050
2008 Range Rover FullFat
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post #8 of 11 Old 26th June 2019, 10:30 PM Thread Starter
AlexDoran
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I have only ordered a battery so far, the car has a warranty that im still waiting for to be transferred to my name then i might try and get the Alternator done on that.

Is the regulator hard to change if you dont have ramps?

Thanks for the advice.

Alex
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post #9 of 11 Old 26th June 2019, 10:41 PM
horse86
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Quote:
Originally Posted by AlexDoran View Post
I have only ordered a battery so far, the car has a warranty that im still waiting for to be transferred to my name then i might try and get the Alternator done on that.

Is the regulator hard to change if you dont have ramps?

Thanks for the advice.

Alex

I did my alternator on the floor of my garage on jack stands. Kind of a PITA of a job TBH. Never attempted this prior to doing mine. Dedicated a weekend to it. Would have been MUCH easier on a lift.

- Justin

/// 2008 Space Grey M5 (SMG)
2009 Triumph Speed Triple 1050
2008 Range Rover FullFat

Last edited by horse86; 26th June 2019 at 10:43 PM.
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post #10 of 11 Old 26th June 2019, 11:00 PM
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If your car is acting like this or maybe like that then it's most certainly the voltage regulator.

Last edited by antithetic; 26th June 2019 at 11:01 PM.
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