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Volvo XC40, formerly 2015 match 177ps 4mo DSG
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Never in the 6 years I had the Tig with a VW approved (Westfalia) wiring kit installed.

Has this just happened, when was the towbar wiring fitted, was it a full approved kit and the car coded?

It could be a short in the wiring socket caused by damp, as I believe it detects a trailer by passing a miniscule current looking for light filaments. May be squirt copious WD40 in the tow socket.
 

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Volvo XC40, formerly 2015 match 177ps 4mo DSG
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Suggest my last paragraph then as it's been OK till now.
 

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Do you have parking sensors? The rear ones get diabled when trailer is attached.
Also on mine whne I put ca rin reverse, if trailer is attached there ia picture of a trailer behind the car - do you get this?
Have you tried removingthe fuse for the towbar electrics? This should reset it.
 
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