My new to me 01 Jimmy is having an issue. While driving, the ABS and brake idiot lights come on. Nothing feels different, just the lights. They eventually go away and may not return for a day or two.
Anyone know the problem and hopefully a fix?

 

Have you checked your brake fluid. Usually both lights come on when low on fluid or it might be a switch starting to go bad. But I would start with the fluid level first

 

Fluid is topped off, lights still on... Crap

 

At this point I would lean toward an abs sensor. or there might be some air in the abs unit that is causing a low fluid spot

 

when the brake light is on check your parking brake obviously but also go into the engine compartment and look at the ABS valve array and there should be a 2 wire connector between the master cylinder and the ABS... disconnect that and look to see if the light went off.... if it did it means your proportion valve is not centered. as for the abs light could be a sensor in the front hubs or a bad board or bad pumping motor... or just a gitch! good luck

 

when it is on get the code checked. it could be anything above, or a bad ground for the abs controller, or it might need rebuilt. there is a lot of info out there about fixing the controller and the ground.

 

I would take a listen for a front hub bearing on its way out
Usually the bearing failure causes failure of the ABS sensor

If you can find a vacant road where you can safely drive a slalom coarse at about 40 to 50 mph
Drive the slalom and listen for noise when the weight transfers from side to side
If noise occurs when the weight transfers onto the wheel and goes away when the weight is lessened look closer at that hub bearing

 

abs sensor - sounds right to me

 

does this year have the sensors integrated in the hub assembly???