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  #1  
Old 01-07-2012, 10:50 PM
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Dreaded "Service 4WD System" Message

Starter went out last month...and now this is happening. Was just driving 65 on the highway and the message popped up. Drivability is the same, haven't noticed anything different. Just rolled over 76k miles.

My question is, what cna I expect from the dealer? Or what will trigger this message? I'm hoping it's something fairly cheap since the starter set me back a couple hundred last month..

Any input helps
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Old 01-07-2012, 11:17 PM
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Re: Dreaded "Service 4WD System" Message

If your final drive control module has not been updated and the code is stored your repair process will likely begin with a flash of the FDCM as there is a flash for the FDCM that doesnt specify applicable dtc's it simply states "if the code is stored". From there it could be the transfercase, the FDCM itself, wiring, your 4lo switch....
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Old 01-08-2012, 01:47 AM
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Re: Dreaded "Service 4WD System" Message

there is also the false 4wd fault message. i used to get it all the time.
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Old 01-08-2012, 02:29 AM
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Re: Dreaded "Service 4WD System" Message

yeah, the erroneous message is what the update is for.
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Old 01-08-2012, 08:44 AM
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Re: Dreaded "Service 4WD System" Message

I replaced the sensor in my rear differential and it went away.
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Old 01-08-2012, 10:57 AM
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Re: Dreaded "Service 4WD System" Message

I had the same stuff-flashing FCDM did it for me. I still don't agree with having to pay for a re-flash, if it's defined in a TSB....
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Old 01-08-2012, 12:14 PM
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Re: Dreaded "Service 4WD System" Message

There are tons of reasons it could come on, so having it scanned is the best way to pinpoint the cause and troubleshoot.

When it comes to things like this (or other things that require the dealer to scan), I wait until I am going there for something else like an oil change, and then I ask them if they can just scan it real quick since it is already in the bay and the tech is already there. I have never had to pay for them to scan and look something up..
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Old 01-08-2012, 09:58 PM
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Re: Dreaded "Service 4WD System" Message

Well on my way to work it went off lol..
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Old 01-08-2012, 11:17 PM
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Re: Dreaded "Service 4WD System" Message

On my 06 XK, it came on, and since I do not use 4x4 in Florida, it didn't concern me at all. It stayed on for quite a while before I took it in. It had a code stored for clutch wear, but they looked fine. I had the code cleared and it has never come back on.

Some people have the message come on, and can still engage 4Lo but some can not. I had one of the cases where 4Lo would not engage with the message on. I am not sure if it still had full time 4WD, since I never take the XK in a situation when it would be needed. I just know I tried to engage 4Lo and it would not.
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Old 01-09-2012, 07:27 AM
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Re: Dreaded "Service 4WD System" Message

These are ALWAYS 4wd they cant be shifted into 2wd like the old ones.
When mine popped up it was just a wheel sensor.
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Old 01-09-2012, 09:31 AM
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Re: Dreaded "Service 4WD System" Message

I'm not too worried about it since it went off, must mean its nothing major. Also have no use for the 4WD right now since it hasn't snowed any.
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