Error code

OBD2 P0598

OBD2P0598
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Thermostat Heater Control Circuit Low.

Severity

moderateCan drive, but performance may be affected.

Summary

P0598 indicates an abnormally low voltage in the control circuit of the electronically controlled thermostat, which is used to regulate engine temperature on certain BMW, Mercedes, Jaguar, Mini, Opel, Audi, and VW models.

Symptoms

  • Engine may take longer than usual to warm up
  • Potential decrease in fuel efficiency

Common Causes

  • Damaged or disconnected wiring and connectors
  • Defective thermostat heater element
  • Corroded electrical connections
  • Low coolant level
  • Faulty engine coolant temperature sensor

Diagnosis

  1. Inspect wiring and connectors for damage or corrosion
  2. Check thermostat heater element for proper operation
  3. Verify coolant level

Fixes

  • Replace faulty thermostat or heater element

FAQ

What does P0598 mean?

P0598 indicates a low voltage issue in the electronically controlled thermostat's circuit, affecting engine temperature regulation.

How do I fix P0598?

Fixing P0598 typically involves inspecting and repairing wiring issues or replacing the faulty thermostat heater element.

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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