Bizarre electrical fault - VW Polo 2015 - Help!


Registered User
Reaching out to the experts on the forum......

VW Polo 2014 (64 plate) 1.4 TDI

I have a strange electrical fault with my wife's car. Progressively got worse over the last couple of days.

The car starts and drives fine, no loss of power etc...

When driving the electrics cut out for about 0.5 seconds, like a controller resetting.
I then get 2 faults on the display - Check coolant + Check windscreen wipers.
The coolant is OK and the wipers work apart from I have to keep my finger pressed down on the stalk to get them to run.
The indicators do not work along with the Hazards, rear heated window, high beam.
The indicators do work when I lock and unlock the car.

Can anyone suggest anywhere to check?
Maybe a relay or controller location?

At work all day today so would be nice to resolve this before I have to drive home in the dark!

Thanks in advance.
Last edited:


Registered User
Update -

Just started the car again and everything is working.

This is intermittent so maybe a connector or relay issue.

Any advise on where to check would be greatly appreciated.



Registered User
Might have found the problem.

The Negative battery terminal was loose.

Tightened up and will see if the problem re-occurs on the way home tonight.


Registered User
Tightening the negative connector on the battery did not resolve this issue.

Same issue this morning -

Also noticed that I only have the passenger tail light working, no number plate lights or drivers side tail light.

Brake lights work.

Thinking it might be a relay that controls a controller? It is intermittent, worked fine for 30 seconds after starting this morning.

Does anyone know where to check?

Location of said controller that handles the light control (indicators, main beam, heated rear window, hazards etc...)

Working again today, but will have a look at lunchtime when it is light.

Many thanks,



Registered User
Had another go at this.
All works fine when ignition first switched on.
Put side lights on and checked the rear light cluster.
Passenger side was fine, drivers side was pulsating intermittently. After about 10 seconds they all went off, and on again, alerts on dashboard stating to check wipers and coolant level.
When this happens the only light I have on the rear is the passenger brake light, nothing else is on.
Pulling my hair out now.
Any ideas?
Earth, relay, controller?
Many thanks,


Registered User
Not sure if this is of any help but previous cars have had this problem and variety of causes.
Have you checked the front scuttle under the wipers to make sure that the wiper motor is not under water, drain holes blocked .
Is there any water getting into the rear light assembly causing a short when on the move.
Could it be the wiper stalk which sounds as if faulty, if having to hold it down to work


Registered User
I've just seen this!
My guesses are:-
The coolant low warning could be the sensor in the coolant tank - needs a new tank complete with sensor, quite cheap.
Other issues could be the steering column switches assemblies.

Maybe you have worked that out already though.