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The computer system reset every time you turn key off. The system then does a 3 second bulb check to verify all is functioning correctly. If all is well stays off. The reason why it only turns on when moving is because the abs sensors are either not picking up any vehicle speed from one of the wheels or there is a faulty connection in wiring at one of the wheels. Need to have vehicle scanned by a good shop and verify which wheel is causing the problem. If light is on ABS and traction control systems are disabled.
Turn the ignition to ON, with the engine off. Fully depress and release the accelerator pedal slowly three times within five seconds. The reset is complete when you hear the chimes and the “CHANGE OIL” light goes out. If the light stays on and no chime is heard, you will need to repeat the reset procedure. Turn the key to OFF. If the “CHANGE ENGINE OIL” message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure.
You need a new wheel bearing, This also happened to my olds alero, make sure 2 jack up each tire 1 at a time and pull back and forth on them checking for play, once you have found the 1 that has play or wobbles that is the 1 that needs a new wheel bearing
The MIL light AKA service engine soon light comes on to warn of a malfunction in the emission control system or a problem with electronic engine controls like fuel control, there will be one or more trouble codes stored in the PCM (powertrain control module) to show what system or sensor has an issue/problem, take the car to any Kragen Auto, Auto Zone or other chain parts store and they will test it for free, write down the trouble code or code's and post them back on this same thread for me to look at, then we will have some info on what to fix to get the light to go out, also have them reset the light when they test it, it will come back on in a few days, but maybe we can fix it before then, OK?