Our xc90 has had some warning lights off and on.abs and traction control warning lights are intermittent.....completely random as to when they come on and turn off. The brakes work great as far as we can tell, of course we've never slammed the brakes going 80 or anything, but far as I can tell the brakes work fine other than pulling to the left. I had the code pulled and it said " abs module control circuit voltage out of range" the Indy shop I went by said to replace the control module underneath the pump and valve body.afterward same result ,pulls to the left while braking .it seems like it would be the caliper but I tested that w the car jacked up and can't tell one way or another if there is a problem w the caliper.the pad wear looks pretty even also.nexg step is to see if the same code is present.maybe someone has experienced this issue?

 

This may seem obvious...... but check the opposite caliper. It may be stuck "off"

 

In addition to a possible stuck caliper, there is also a valve body in the ABS - again if one wheel is not getting fluid due to a stuck valve, its usually the opposite side that locks up. You can start by jacking up the car to see if all four wheels are getting pressure to the caliper and if the caliper is actuating. you probably have not driven long enough to have worn the pads but my two cents is this is not the thing leave too long before getting it fixed properly. Pulling is a sign something is wrong with the braking system and you don't want a panic stop accident to tell you how wrong.

 

Well it had a voltage out of range abs code .I switched out the module as suggested by a shop....no result.

 

But there's no locking up just pulling

 

I am reading control arms can cause the problem but I don't see any cracks