Hi. I'm new to the forum, so here goes with my first post! In all the rain we've had in the UK water has found it's way into the connectors (& who knows where else) of the power steering pump on my 2005 2.0D S40. After one 50 mile motorway trip the car was left for 24 hours and on restarting there was no power steering. My mechanic traced the fault to water in the pump connectors and drained and dried out what he could find but although the pump works fine, it won't switch off after the ignition is turned off and the key removed. Is there a switch in the pump unit which may have been damaged by the water? If so is the solution a new or salvaged pump?

 

To my knowledge power steering is controlled by a hydraulic belt driven pump. Not possible for any operation by electric anything. Check your owners manual to see if it has a fluid reservoir.

 

It has an electric pump.

Even if it was belt driven, what would low fluid have to do with it?

The module for the pump may have been damaged. If so, the pump needs to be replaced.

 

Thanks. Yes, definitely an electric pump. Would a 2nd hand replacement need to be re-coded to the car's electrics. I'm told by a Volvo dealer that a new one would and there is now a new type of connector. So did Volvo recognise that there was a problem with water ingress and modify??

 

They are programmed to the car. I have never tried a used one so I'm not sure if it can be reprogrammed.

There is a new connector and wiring harness but I don't remember what year that started.