Possible Causes

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Good trip equal to zero.
(K118) Battery temp signal circuit shorted to voltage.
Battery temperature sensor.
Resistance in the (K118) battery temp sensor signal circuit.
Resistance in the (K4) sensor ground circuit.
(K118) Battery temp sensor signal circuit shorted to ground.
PCM.