AutoCodes – Audi – P0598 Audi

P0598 Audi Code - Thermostat Heater Control Circuit Low

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: P0598 Audi indicates Thermostat Heater Control Circuit Low.
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 6,920

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 P0598 Audi 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 P0598 Audi - Thermostat Heater Control Circuit Low - AutoCodes.com — P0598 Audi Code - Thermostat Heater Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0598 Audi?

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

How to Fix the DTC P0598 Audi?

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 P0598 Audi 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 P0598 Audi Code

1. What are common symptoms of OBDII code P0598 in an Audi related to the thermostat heater control circuit?

The common symptoms include engine overheating, temperature gauge fluctuations, poor fuel efficiency, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code P0598 in an Audi?

The code P0598 in an Audi is typically caused by a faulty thermostat, damaged wiring or connectors in the heater circuit, a malfunctioning coolant temperature sensor, or a defective thermostat heater control module.

3. How can I diagnose the issue related to OBDII code P0598 in my Audi?

Diagnosing the problem involves checking the thermostat operation, inspecting the wiring and connectors for any damage, testing the coolant temperature sensor, and using a diagnostic scanner to retrieve freeze frame data and monitor live data related to the thermostat heater control circuit.

4. Can I continue driving my Audi with OBDII code P0598?

It is not recommended to drive your Audi with the code P0598 as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further problems.

5. What are some repair tips for fixing OBDII code P0598 in an Audi?

Repair tips include replacing the thermostat if it is faulty, repairing or replacing damaged wiring and connectors, testing and replacing the coolant temperature sensor if needed, and checking the thermostat heater control module for proper functioning.

6. How much does it cost to repair OBDII code P0598 in an Audi?

The cost of repairing OBDII code P0598 in an Audi can vary depending on the specific cause of the issue, parts needed for replacement, labor costs, and the repair shop's rates. It is advisable to get a diagnostic and repair quote from a qualified mechanic.

7. Can I reset the OBDII code P0598 in my Audi without fixing the underlying issue?

Resetting the code without fixing the underlying problem will only temporarily turn off the Check Engine light. The code is likely to reappear once the issue persists, and it is essential to address the root cause of the problem for a permanent solution.

8. Is OBDII code P0598 a common issue in Audi vehicles?

OBDII code P0598 related to the thermostat heater control circuit is a relatively common issue in Audi vehicles, especially in models equipped with electronic thermostat control systems.

9. Can a DIY enthusiast fix OBDII code P0598 in an Audi?

While some repairs related to OBDII code P0598 can be done by DIY enthusiasts, diagnosing and fixing electrical issues in the thermostat heater control circuit may require specialized tools and knowledge. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

10. How long does it take to repair OBDII code P0598 in an Audi?

The repair time for OBDII code P0598 in an Audi can vary depending on the specific cause of the issue, the availability of parts, and the expertise of the mechanic. In general, the repair may take a few hours to half a day, but it is best to consult with a mechanic for a more accurate estimate.