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P0599 Mercedes-Benz Code - Thermostat Heater Control Circuit High

- Code Popularity: 7,082 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0599 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Thermostat Heater Control Relay
  • Thermostat Heater Control Relay harness is open or shorted
  • Thermostat Heater Control Relay circuit poor electrical connection
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How to Fix the DTC P0599 Mercedes-Benz?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

Mercedes Benz Code = 0153 (Three-disk thermostat valve) has a short circuit to positive. (P0599)

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0599 Mercedes-Benz code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code P0599 Mercedes-Benz Description

This fault code is stored in the Engine Control Module (ECM) 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.

OBDII Code P0599 Mercedes-Benz - Thermostat Heater Control Circuit High - AutoCodes.com
P0599 Mercedes-Benz Code - Thermostat Heater Control Circuit High

Need More Information on the Code?

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