Mazda CX-9 This larger SUV adds a V6 option, as well as more cargo room, to the CX-7 option.

2010 CX9 AWD - FWD light on

  #1  
Old 04-23-2017, 08:20 PM
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Default 2010 CX9 AWD - FWD light on

Hello all.
My cx9 grand touring AWD has a noise coming from the rear of the vehicle (passenger side). It sounds like a wheel bearing issue since it is sort of mild rumbling.. Not quite grinding. I have had bearing replaced on this vehicle before and it sounds similar but not quite. The question is would a wheel bearing issue cause the FWD light to turn on.? I can start the car and it is not one but as soon as I start driving it comes on.

I guess I am concerned about it being gear box or transmission related. I did have the gear box replaced at around 90k miles due to cracking of the gear box. This was a known issue and mazda replaced it for free. But I am worried this might be related to that.

Could a bad wheel bearing cause the FWD light to come on.?

Thanks much
Dave
 
  #2  
Old 04-24-2017, 01:16 AM
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Antilock brakes and the switch from 2WD to AWD run off wheel speed sensors. If you have a wheel bearing starting to fail, yes, it could turn on the FWD light. Get it checked
 
  #3  
Old 04-24-2017, 09:47 AM
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Thanks much for the reply. I have an appointment tomorrow morning.
 
  #4  
Old 04-25-2017, 10:18 AM
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Well I took it in this morning and the 2 rear wheel bearings are bad. The car has 121k on it. Odd because I had one of the rear bearings replaced 50k miles ago. Odd it did not last. Mechanic says bad design.

Also rear brakes down to nothing. I expected that. Cost for all of this is $1800. Now if I did not have new tires put on 6 months ago and the replaced transfer case last summer (due to that well known issue with these cx9s and cracked transfer cases) I would not get it fixed and trade it in. But I think I will spend the 1800.

What do you all think? How many miles do you have on your cx9?

Thanks
Dave
 
  #5  
Old 04-25-2017, 03:52 PM
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$1800 seems quite high. I suggest getting a few quotes first.
 
  #6  
Old 04-25-2017, 04:09 PM
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Thanks much.. Actually, I got some more bad news. They were going to start the job to replace the bearings and do the brakes but I asked them to troubleshoot the 4WD light first because I recall reading somewhere that the 4WD light could point to a bigger problem with the transmission. So they tested with the computer and it said something about a wire that was ripped off the coupler/differential causing the problem with the light. He told me that I should start shopping for another car because that job would cost $ 2500 on top of the $1800 for the bears and brakes. So he was saying it was electrical and not mechanical. I find it hard to believe that the wire underneath would cause a $ 2500 job. Is it a closed system ?

Anyway, I am taking it to Mazda Friday morning to get a second opinion. The guy I had look at this has been great in the past but I want Mazda to look at it.

Any thoughts? I know the car has 121K on it but I was really not ready to purchase another car.

Thanks again for your input.
Dave
 
  #7  
Old 04-25-2017, 06:24 PM
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Unfortunately it looks like the issue is error code P1887 as referenced in the following thread.


https://www.mazdas247.com/forum/show...problem-solved

In my case the wire broke right off so it looks like differential needs to be replaced
 
  #8  
Old 04-26-2017, 04:29 AM
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At 121,000 miles, its time to sit down & reassess the financial viability of your vehicle.

If you can fix the Diff wiring then great.
 
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