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Enes, Volvo Master Technician
Category: Volvo
Satisfied Customers: 5559
Experience:  18 yrs+. experience as Volvo & ASE Certified Master Technician.
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I have a Volvo XC70 2009 reg. I have had fitted a Genuine Volvo

Customer Question

I have a Volvo XC70 2009 reg. I have had fitted a Genuine Volvo towing kit. After 3 years of use I am now getting the following Faults displayed when towing, these faults are shown when towing a caravan or trailer of which I have towed two of each to try to determine whether the fault is on the caravan /trailer or car. It would appear that after towing four different vehicles that the is with the car.
Faults. Intermittent fast flashing message; Faulty trailer indicator bulb/faulty trailer light. Indicators will sometimes flash at speed as if a bulb has failed. While these messages are being displayed all towed vehicles have been checked and there is no fault found side, brake, and indicators are all working. When the indicators are flashing fast as if a bulb has failed there is no bulb fault they are all working fast on car and towed vehicle. Has the trailer Module failed I have unplugged and cleaned the plug and sockets with electrical cleaner and also cleaned the towing module earthing points all to no avail. Can you help please. If the Module needs to be replaced is it as simple as unplug and reconnect.
Submitted: 2 years ago.
Category: Volvo
Expert:  Enes replied 2 years ago.
Hello and welcome to our web page here my name is***** a Certified Volvo Car Expert Mechanic.I'm going to try today to answer your looks your module is failed but see on that model the module will require reprogramming with software at volvo garage after install they only have access to do it . But from what you saying all points to failed control module .
Customer: replied 2 years ago.

ok, thank you. Now booked into Volvo to be sorted but they already had one look and said nothing wrong with my car but now having connected various trailers/caravans they admit it looks as though the fault is with the car.

Expert:  Enes replied 2 years ago.
VOLVO sales that part and they should be able to support and service it trailer shop will not have access to VOLVO trailer module and software if volvo dealer can't fix they need to open volvo technical assistance with volvo engineers
Expert:  Enes replied 2 years ago.
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