You guys can unhook the battery but you're only putting a band-aid on it. You're not fixing the problem. Though it's possible, it's not likely that the light came on as a freak.
Chances are there is a problem and clearing the code by undoing the battery will do just that... clear the code... doesn't fix the problem.
Take it to someone who an OBDII diagnostic aid like the GM's Tech II or Snap On's version and get the code read so you can get it fixed before you get stranded when you don't need to be.
Mark
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