Engine-Codes - Mercedes-benz - P0597 MERCEDES-BENZ

P0597 MERCEDES-BENZ Code - Thermostat Heater Control Circuit/Open

- Code Popularity: 11,685 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0597 MERCEDES-BENZ Code?

  • Faulty Thermostat Heater Control Relay
  • Thermostat Heater Control Relay harness is open or shorted
  • Thermostat Heater Control Relay circuit poor electrical connection

|How to Fix the P0597 MERCEDES-BENZ Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0597 MERCEDES-BENZ code tech notes

Mercedes Benz Code = 0154 (Three-disk thermostat valve) has an open circuit in the wiring. (P0597)

|What is the cost to diagnose the P0597 MERCEDES-BENZ code?

Labor: 1.0

The cost to diagnose the P0597 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0597 MERCEDES-BENZ code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0597 MERCEDES-BENZ Code Mean?

This fault code is stored in the engine control module when the thermostat heater control circuit malfunctions. An electronically controlled heater element is integrated into the engine coolant thermostat. The purpose of the heater element is to allow the conventional wax thermostat to open at a lower coolant temperature. Greater cooling is required under full load conditions so the thermostat can be opened at a lower temperature to allow greater cooling. The thermostat operates in the conventional way during low or part load conditions. The thermostat heater element has a system voltage supply and a pulse width modulated ground control circuit.

Thermostat Heater Control Circuit/Open

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