You appear to have gotten the various penalties mixed up.

CA provides taxpayers with an automatic 6-month extension without any need to file any form or make any payment.  Essentially, taxpayers who fail to file by April 18 will be extended to October 17.  The 5% per month late filing penalty (subject to both a ceiling and a floor) will not be assessed unless the taxpayer then fails to file by the extended due date.

The 5% penalty you mentioned is part of the late payment penalty.  0.5% is also imposed for each month the payment is late, for up to 40 months.  The penalty is subject to a maximum of 25%.  Taxpayers are, however, presumed to have reasonable cause and can avoid this penalty if at least 90% of the tax (not tax due) is paid by the original due date.

In other words, you cannot avoid the 5% late payment penalty by simply making a $1 tax payment.