I am fairly certain something happened with one of the wheel speed sensors. Any other possibility is just very unlikely, although it could in theory be something else, again it's very unlikely.
ABS lights are very common after doing wheel bearings. The wheel speed sensors are actually pretty delicate.
Since you have all wheel drive, check the condition of both the tone rings on the rear axle shafts. They have a bunch of teeth and are what the wheel speed sensors use get their information. They commonly crack and when that happens you will end up with the abs light. Grab a hold of them and try to turn them. They should not turn.
You dont have to take everything apart, in fact I would encourage you not to do that. Just inspect the sensors for any signs of damage, and their wiring. If they both look fine, then you will need a scan tool with abs to determine which sensor is damaged. Another possibility, and probably the most likely is, when you had your old bearing out, the rear axle shafts were obviously loose, and that tone ring I was just talking about could have very possibly hit or bumped the surface of the wheel speed sensor. If that happened, that sensor is bad. At any rate, you almost definitely have a bad sensor. Just a matter of which one.
The traction light is secondary to the abs light, and the powertrain light will almost certainly be relieved after repairing the wheel speed sensor as well.
Sorry it took me so long to type that. :/
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