Possible Causes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
BATTERY TEMP SENSOR VOLTAGE ABOVE 4.9412 VOLTS
BATTERY TEMPERATURE SENSOR
(K118) BATT TEMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K25) BATT TEMP SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN
PCM