The P0598 trouble code indicates that there is a low voltage condition detected in the thermostat heater control circuit. Modern engines use a thermostat to regulate engine temperature. The thermostat heater helps to warm up the thermostat quickly to allow the engine to reach operating temperature more efficiently. A low voltage condition in this circuit can prevent the thermostat from heating up properly, affecting engine performance and emissions.
P0598 Thermostat Heater Control Circuit Low
Code symptoms P0598.
1. Engine takes longer than usual to reach operating temperature.
2. Poor fuel economy.
3. Heater may not function properly.
4. Check Engine Light illuminated.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0598.
1. Faulty thermostat heater.
2. Low voltage in the thermostat heater control circuit.
3. Wiring or connector issues in the thermostat heater control circuit.
4. Corroded or damaged terminals in the thermostat heater control circuit connectors.
Code Solutions P0598.
1. Inspect the thermostat heater for any signs of damage or malfunction and replace if necessary.
2. Use a multimeter to check the voltage in the thermostat heater control circuit. If voltage is low, diagnose and repair any issues causing the low voltage condition.
3. Check the wiring and connectors in the thermostat heater control circuit for damage or corrosion. Repair or replace any damaged wiring or connectors.
4. Thoroughly inspect the terminals in the thermostat heater control circuit connectors for corrosion or damage. Clean or replace any affected terminals.