AutoCodes – MINI – P0599 MINI

P0599 MINI Code - Thermostat Heater Control Circuit High

Quick Answer

The Engine Control Module (ECM) controls the Pulse Width Modulated (PWM) thermostat. Common causes include Failed Engine Cooling Thermostat, Engine Cooling Thermostat harness is open or shorted, Engine Cooling Thermostat circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0599 MINI indicates Thermostat Heater Control Circuit High.
Common causes: Common causes include Failed Engine Cooling Thermostat, Engine Cooling Thermostat harness is open or shorted, Engine Cooling Thermostat circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 25,535

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 27, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0599 MINI Description

The Engine Control Module (ECM) controls the Pulse Width Modulated (PWM) thermostat. The engine coolant thermostat heater controls coolant flow and regulates the engine operating temperature. The ECM supplies 12 V to the thermostat. The ECM controls the engine coolant thermostat heater by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

OBDII Code P0599 MINI - Thermostat Heater Control Circuit High - AutoCodes.com — P0599 MINI Code - Thermostat Heater Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0599 MINI?

Failed Engine Cooling Thermostat
Engine Cooling Thermostat harness is open or shorted
Engine Cooling Thermostat circuit poor electrical connection

How to Fix the DTC P0599 MINI?

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

What does this mean?

Code Tech Notes

If there are no coolant system leaks, replace the thermostat to fix the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0599 MINI code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0599 MINI Code

1. What are the common symptoms of OBDII code P0599 in a MINI Cooper?

Common symptoms of code P0599 include the engine running hotter or colder than normal, poor fuel efficiency, and the Check Engine light illuminating on the dashboard.

2. What causes the OBDII code P0599 in a MINI Cooper?

The most common cause of code P0599 is a malfunction in the thermostat heater control circuit, which is responsible for regulating the engine's temperature.

3. How can I diagnose the OBDII code P0599 in my MINI Cooper?

Diagnosing code P0599 usually involves using a diagnostic scanner to read the code and conducting a visual inspection of the thermostat heater control circuit for any visible issues.

4. Can I continue driving my MINI Cooper with OBDII code P0599?

It is not recommended to drive your MINI Cooper with code P0599 for an extended period as it can lead to potential engine overheating or other related issues.

5. How can I repair OBDII code P0599 in my MINI Cooper?

To repair code P0599, you may need to replace the thermostat assembly or repair the thermostat heater control circuit, depending on the specific issue identified during diagnosis.

6. Are there any DIY tips for fixing OBDII code P0599 in a MINI Cooper?

While some basic troubleshooting steps can be taken, it is recommended to consult a qualified mechanic or dealership for proper diagnosis and repair of code P0599 to ensure the issue is resolved correctly.

7. How much does it cost to fix OBDII code P0599 in a MINI Cooper?

The cost of fixing code P0599 can vary depending on the specific repairs needed, parts required, and labor rates in your area. It is best to get a few quotes from reputable repair shops for an accurate estimate.

8. Can a faulty thermostat cause OBDII code P0599 in a MINI Cooper?

Yes, a faulty thermostat can contribute to triggering code P0599 as it can affect the thermostat heater control circuit's ability to regulate the engine's temperature properly.

9. Is it safe to reset the Check Engine light after fixing OBDII code P0599 in a MINI Cooper?

Once the underlying issue causing code P0599 has been addressed and repaired, it is safe to reset the Check Engine light using a diagnostic scanner to clear the code from the vehicle's system.

10. How often does OBDII code P0599 occur in MINI Cooper vehicles?

Code P0599 related to the thermostat heater control circuit high is a relatively common OBDII code that can occur in MINI Cooper vehicles, especially as they age and components wear out.