DTC P0597-13: Thermostat Heater Control Circuit/Open - Circuit open: 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 ground, short circuit to power, open circuit, high resistance
- Clear the DTCs and retest
- Check and install new coolant thermostat heater as required