Question about 2006 Volvo S40

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I have a 2006 Volve S40 with about 60,000 miles. During July, the electrical system began behaving erractically. Sometimes the car wouldn't start and had to be towed. When it was "fixed" at that dealership, I drove the car from Brooklyn to Cape Cod and had to pull over and stop at least five times enroute. It would feel as if someone put the emergency brake on and then the dash told me to pull over and stop safely due to brake failure. Then the next message was reduced engine performance, stop safely. Sometimes the key would not come out of the ignition. Other times the blinkers flashed and I was unable to shut them off. I took the car to the dealership on Cape Cod and they "fixed" it three times, only to have the same problems recur on my drive home. The car has been at the same dealership for about four weeks and they have found a rodent's nest and replaced the engine control module. The same problems are still happening. They have called in a specialist, but nothing has changed. I have been without a car since July 23rd. Can you help me? Any advice would truly be appreciated. Thanks in advance.

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  • annwalas Sep 16, 2010

    Paul,
    Thanks for the sad story, even if I expected it. Please tell me what a wire loom is so I can talk to the meachanics at the dealership. Thanks.

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  • Volvo Master
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Hi Ann this sounds like your typical case of incompetence by the dealership, to be honest if they had guys that worked there worth their salt ime sure they would have diagnosed the problem and had it sorted for you within a week or less, it is obvious that the critter has chewed the wiring and has created a short circuit in the system, the wiring loom is the complete vehicle wiring system for the whole of the vehicle, it connects all the components that is required for running the vehicle, this can be taken out in parts or as a whole, by the sounds of things the the dealership are either removing the whole of the loom, or just sitting on it doing nothing, as to be honest to replace the whole of the loom would take a good mechanic a week to ten days so unless they are changing out all major components in the vehicle as well as the loom, i would start making a point of asking what are they doing....hope this helps

Posted on Sep 16, 2010

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  • Master
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HI, this could be a nightmare to put right, as they have found a rodents nest and replaced the ecu and your still having problems this would mean you have got a few wires shorting out somewhere due to the rodents chewing through them.

the problem with this is it would take weeks if not months to go through every single wire checking for shorts or broken wires, i mean if you was going to do it yourself the dash would need to come out and the wires in the engine bay would need testing but the problem with this is they may test ok but when the car is moving the wire may move and then short so it will be a nightmare of a job and would cost hours and hours in labour charges.

if i was you i would price up a complete wiring loom from front to back as this is the only real way your going to solve the problem, the rodents would have chewed through several wires and got into places that you cant see so tracing all these damaged wires would take hours and hours and would cost a fortune, i would have a word with the garage and ask them to price up a new loom and ask them how much to have it fitted.

as you have changed the controle module and still have the same problem then it is going to be a short somewhere or even a wire going to a sensor or sensors, the problem with testing the wires is that some of the sensor only work when the car is moving and others only work when the engine is running so finding the fault would just take to long.

has the garage done a diagnostic check to check for any error codes as this should give you some idea of where the fault is. get them to do this and see what pops up, but failing that your going to need to get the whole loom changed.

you can buy these new from main dealers but will be pricey how ever you could contact a breakers yard as they should be able to sort you one out.

let me know if you need further assistance ok

Posted on Sep 15, 2010

  • paul proctor Sep 16, 2010

    Hi, the wire loom is the complete set of wires for the car from front to back, it will ensure all the wires are perfect and not been chewed up and wont be causing you a short.

    your best option would be get them from a breakers yard but you can get them new,.

    its all the wires on the car from the back lights to the head lights and all the bits in between.

    i have worked on several cars that have had vermin in them such as squirrels,mice,rats,birds,even kittens living under the hood and tracing all the chewed wires can take weeks and even then you might not get them all and all this time the customer is paying the hourly rate on the work done, so to save time you would be a lot better of getting a complete loom.

    doing this will ensure you have got no chewed wires and you will have no further problems with your car.

    it would just take to long to find the faults and get it sorted as the little critters get into every nuck and cranny chewing everything along the way

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