2006 H3 Base. I have searched for this particular problem but only found situations where the lights stay lit. I have had the ABS/Traction lights coming on then go off while driving. Sometimes after the lights have gone off, the brakes seem to grab at a stop and there is a click sound that I also feel in the brake pedal. Sometimes the brakes will feel normal coming to a stop. Randomly the lights may come back on again, then go back off and the cycle will continue. No loss of power during all of this though. I still have the stock battery terminals but had the battery replaced a few weeks ago. The Hummer seems to start fine although I do notice when the click sound/feel at the brake pedal happens when coming to a stop, the headlights might briefly dim then come back up.

 

I would see if a code reader could capture the fault codes.

Did this issue start right after the battery swap? Possible that an ABS wire is loose or going bad too.

 

Finally was able to check the code and the front left sensor is the culprit. That bearing also happens to be showing some slight play so I will kill two birds with one stone.