P0597 Fault Code

Thermostat Heater Control Circuit / Open

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0597 error code refers to an issue with the Thermostat Heater Control Circuit in a vehicle. This code is triggered when the Engine Control Module (ECM) detects that the thermostat heater circuit is open, meaning that there is an interruption or break in the circuit. Properly functioning thermostats are essential for regulating the engine's temperature and optimizing performance.

What are the symptoms of the P0597 code?

• Engine overheating
• Incorrect engine temperature readings on the dashboard
• Poor fuel economy
• Check Engine Light (CEL) illuminated on the dashboard
• Engine performance issues, such as lack of power or sluggish acceleration

What causes the P0597 code?

• Faulty thermostat heater
• Open or shorted wires in the thermostat heater circuit
• Damaged connectors or terminals
• Malfunctioning ECM
• Corrosion in the circuit connections

How to fix P0597?

• Inspect the thermostat heater circuit for any signs of damage, such as frayed wires or corroded connectors.
• Test the thermostat heater for continuity; replace it if it's faulty.
• Check the ECM for fault codes and reprogram or replace it if necessary.
• Repair or replace any damaged wiring or connectors in the circuit.
• Erase the error code and conduct a road test to ensure the issue is resolved.