It's almost certain a problem with the alternator
Voltage Regulator?
13.5 to 16 volts.
The cause is the voltage regulator within the alternator (working normal). When the voltage higher it is charging the battery like after you start your car or have the headlights and wipers on. The voltage regulator keeps your battery charged up. In order to charge the battery, voltage must be higher than battery voltage.
Check the alternator. If the voltage is too high it will overcharge the battery and destroy it. If the voltage is too low the battery will discharge and could be mistaken for a destroyed battery.
check the battery voltage, check battery cables, check ignition switch(where you turn the key), or check the crankshaft position sensor. cheers
If your battery light is on while the car is running, it most like means your alternator is not putting out enough power and probably needs replacing.
The voltage regulator for a 1995 Saturn SL2 is in the alternator. Check your charging voltage after the engine is started and has run a few minutes. Should be better than 14 to 15 volts at the battery terminals. Make sure the battery terminals are clean and tight. Had a neighbor replace alternator, battery and starter and all he needed was a good connection to the battery, which I supplied. To load test the alternator, turn on the headlights on high beam, heater fan to top speed and the rear window defoger. Battery voltage should not drop more than 0.25 volts with the engine turning a little faster than idle. Hope this helps.
Have you replaced your air filter lately? If not, try that, reset the computer by unplugging the battery and see if it clears the code.
The battery in the Saturn Vue is located under the hood on the driver's side, near the front of the car.
what does a low battery light look like on a 2001 Saturn
The battery type foe a 2000 Saturn LS2 is a 12 volt side post. The group size of the battery is 75.
Check for spark and fuel