Andrew Ford Posted April 7, 2023 Share Posted April 7, 2023 Good morning all. I have a 2017 Toyota Sienna LE which had a slow coolant leak from the water pump housing. I replaced the water pump and gasket, and since you have to remove the thermostat and thermostat housing to get to the pump, I replaced those as well. I did a pressure test after the job was done, and it looks like the leak may be fixed. When I got up this morning and went to drive the van, I had a check engine light and the cruise control wouldn't work. The error code that it presents is P0598 and gives the text "Cruise Control Control Circuit Low". A quick Google search says that it should be "Thermostat Heater Control Circuit Low". Which is it? should I troubleshoot the thermostat because of the code, or just the cruise control? Any help you guys give will be greatly appreciated! Quote Link to comment Share on other sites More sharing options...
Toyota Owners Club Posted April 14, 2023 Share Posted April 14, 2023 I would be looking at the thermostat area as this is what has been recently disturbed Let us know what you find Quote Link to comment Share on other sites More sharing options...
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