Error code

OBD2 P0597

OBD2P0597
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Thermostat Heater Control Circuit/Open.

Severity

moderateCan drive, but may experience reduced fuel efficiency and increased emissions.

Summary

P0597 indicates an open circuit in the thermostat heater control system, which is part of an electrically assisted thermostat used to manage engine temperature for better emissions and fuel efficiency.

Symptoms

  • Check Engine Light illuminated
  • Engine may not reach optimal operating temperature

Common Causes

  • Damaged or disconnected wiring between the thermostat and PCM
  • Defective thermostat heater element
  • Corroded connectors in the control circuit
  • Failed engine coolant sensor

Diagnosis

  1. Inspect wiring and connectors between thermostat and PCM for damage or corrosion.
  2. Check the thermostat heater element for proper operation.
  3. Verify that engine coolant sensor is functioning correctly.

Fixes

  • Replace damaged wiring, connectors, or faulty components in the control circuit.

FAQ

What does P0597 mean?

P0597 indicates an issue with the thermostat heater control system's electrical circuit.

How serious is P0597?

Moderately serious; it affects engine temperature management and can lead to reduced fuel efficiency and increased emissions.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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