DTC P0599-12: Thermostat Heater Control Circuit High - Circuit short to battery: Action
- Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
- Refer to the appropriate system wiring diagrams and check coolant thermostat heater circuit for short circuit to power
- Clear the DTCs and retest
- Check and install new coolant thermostat heater as required