2004 Chevy Venture. My battery light came on and I replaced the battery and it still came on. I took it to a local mechanic and he replaced the altenator and when I pick it up all of the lights on the dashboard were lit up so I left it for him to continue to look at. Then when I picked it up it appeared to be fine until I was driving for a couple of days then it happened again and then the battery which was 2 weeks old is totally drained. So again I brought it back. He replaced the computer and told me it was fine. So I am driving the car for 20 minutes and the same thing happens again, first the battery light comes on and then the abs and traction lights and the service tractions soon light as well. Please help I need advise I am running out of money.

SOURCE: Transmission Traction "Off" light stays lit with Traction button

The traction control system is controlled through the Anti-lock brake system. The way it works is if one of your wheels starts spinning the ABS applys the brake to that wheel to transfer power to the oppsite wheel that is getting traction. If your ABS is bad then your Traction control won't work. To check it I would find a parking lot on a wet day. In an open space mash in the gas. if you hear the ABS system kick in and you don't squall the tires then your good. My guess is you won't. What I would be worried about is will my ABS work. When checking the traction control is a good time to check the ABS. Acclerate to around 15 mph, then mash the brake as your live depended on it. If you hear a motor run and feel a vibration or grind in the brake peddal, then it works.

SOURCE: traction system light and abs light come on at same time

You still have issues with the speed sensors. The wires that connect to the hubs are known for failure.

SOURCE: 2001 Impala Traction Activates unnecessarily

THE SPEED SENSOR IS LOCATED INSIDE THE HUB ASSEMBLY. THE TWISTED WIRES GOING TO THE SENSORS ARE PROBABLY AT FAULT. THE WHEEL SPEED SENSOR HARNESSES ARE AVAILABLE THROUGH A DEALERSHIP.

SOURCE: Service traction system and ABS light

verify all tire pressures are correct this can affect abs traction control on your vehicle

SOURCE: 2001 impala- Traction, Abs, Brake lights on

abs sensor is built into hub[bearing]common problem when changing them and or brakes r that the sensor connection is not properly reconnected or wire got damaged recheck the sensor wiring and that connector is connected to clip by strut clip is part of system