All Things Mk5 > How to Guides / Troubleshooting

intermittant engine cuts off / loss of power issue

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Rasco:
Need help! Got a serious intermittent electrical fault where the car randomly shuts itself off with no warning whilst I'm driving!

the engine just shuts off, no warning, engine and electrics are all working fine and the rev counter drops off to 0 and all the electrics shut down, I pull over then when i try to restart it i get absolutely nothing when the key is in position 1 or 2 even the little red led display goes off  then after 5 mins switched off  the car seams to reset itself at key in position 1 all the dash lights come on together like the ECU is resetting itself I get and no warning EML Light afterwards like the ECU has loss all comms / power before it has a chance to record the issue its so weird, had the car over two years with no problems only thing I did recently was an oil and filter change?, just complete loss of the engine like a stall with no waning after a few minutes It starts no problem and drives ok done it three times in two days in the dealers now but they say there are no error codes and cannot replicate the fault need help!

been looking online and people with a similar fault say it could be the ignition relay? any ideas, thoughts, welcome.

 

r5gtt:
Hi mate, check battery terminals.

Rasco:
first thing I did, i'll double check though, the battery was replaced for a new one last year.

r5gtt:
Check all wiring to alternator too.

Rasco:
Checked battery voltage, with engine on and off both battery and alternator are working fine, it's not a battery issue there is charge and sufficient current to crank the engine fine, the issue is the car has an intermitant fault where you get no dash lights and nothing happens when you put the key in at all totally dead but the headlights work and the heating etc has power but the fans don't work? But on other occasions the car starts as normal no issues at all???????

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