Possible Causes

WARNING: This page is about a different car, the 2004 Dodge Intrepid, 2004 Chrysler Intrepid, 2004 Chrysler Concorde, and 2004 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

Good trip equal to zero.
Generator operation.
(Z1) gen field ground circuit open.
(K20) gen field control circuit shorted to battery voltage.
(K20) gen field control circuit shorted to ground.
(K20) gen field control circuit open.
PCM.