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Engine-Codes – Subaru – P0044 Subaru

P0044 Subaru Code - HO2S13 Heater Control Circuit High

Quick Answer

The P0044 diagnostic trouble code (DTC) for Subaru vehicles specifically refers to the heater control circuit high for the HO2S13 sensor. Common causes include Faulty HO2S13 sensor, Damaged wiring or connectors in the heater circuit, Issues with the engine control module (ECM). Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0044 Subaru indicates HO2S13 Heater Control Circuit High.
Common causes
Common causes include Faulty HO2S13 sensor, Damaged wiring or connectors in the heater circuit, Issues with the engine control module (ECM).
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P0044 Subaru Description

The P0044 diagnostic trouble code (DTC) for Subaru vehicles specifically refers to the heater control circuit high for the HO2S13 sensor. HO2S stands for Heated Oxygen Sensor, and the number 13 indicates that it is the sensor located downstream of the catalytic converter. This sensor is responsible for measuring the oxygen levels in the exhaust gases to ensure the proper air-fuel ratio for combustion.

OBDII Code P0044 Subaru - HO2S13 Heater Control Circuit High
P0044 Subaru Code - HO2S13 Heater Control Circuit High

Common Causes of P0044 Subaru

  1. Faulty HO2S13 sensor
  2. Damaged wiring or connectors in the heater circuit
  3. Issues with the engine control module (ECM)
  4. Corrosion or contamination on sensor contacts
  5. Extreme temperatures affecting sensor operation

Symptoms of P0044 Subaru

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Engine running rough or misfiring
  4. Failed emissions test
  5. Loss of engine power

How to Fix P0044 Subaru

  1. Use an OBD-II scanner to retrieve the trouble code and confirm the issue with the HO2S13 sensor.
  2. Inspect the wiring and connectors in the heater circuit for any damage or corrosion. Repair or replace as necessary.
  3. Test the HO2S13 sensor for proper operation and replace if it is found to be faulty.
  4. Clear the trouble code from the ECM's memory using the OBD-II scanner.
  5. Test drive the vehicle to ensure that the issue has been resolved and the check engine light does not reappear.

Cost to Fix P0044 Subaru

The cost of repairing a P0044 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for a new HO2S13 sensor can range from $50 to $200, depending on the vehicle make and model. Labor costs can add an additional $100 to $200, with total repair costs typically falling between $150 and $400. It's recommended to consult with a trusted mechanic for a more accurate estimate based on your vehicle's specific requirements and local labor rates.

When is the Code Detected?

The P0044 is set when the ECM detects an excessively high voltage through the heated oxygen sensor heater circuit

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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 P0044 Subaru Code

1. What are the common symptoms of OBDII code P0044 in a Subaru related to HO2S13 heater control circuit high?

- Common symptoms include the Check Engine Light being illuminated, decreased fuel efficiency, rough idling, and potential engine stalling.

2. What are the possible causes of the HO2S13 heater control circuit high error code in a Subaru?

- The code P0044 in a Subaru can be triggered by issues such as a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).

3. How can I diagnose the OBDII code P0044 related to HO2S13 in my Subaru?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the fault code, checking the oxygen sensor and related circuitry for damage, testing the wiring for continuity, and inspecting the ECM for any issues.

4. Is it safe to continue driving my Subaru with the OBDII code P0044 (HO2S13 heater control circuit high) present?

- It is not recommended to drive your Subaru with this code present as it can lead to further damage to the engine and emissions system, potentially causing more costly repairs in the future.

5. Can I repair the OBDII code P0044 in my Subaru on my own, or should I take it to a professional mechanic?

- While some DIY enthusiasts may be able to address this code by checking and replacing the oxygen sensor or related components, it is often best to consult a professional mechanic for an accurate diagnosis and repair.

6. Are there any quick fixes or temporary solutions for the OBDII code P0044 in my Subaru?

- Quick fixes like resetting the ECM by disconnecting the battery may temporarily clear the code, but it is important to address the root cause of the issue to prevent it from recurring.

7. How much does it typically cost to repair the OBDII code P0044 (HO2S13 heater control circuit high) in a Subaru?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Will replacing the oxygen sensor fix the OBDII code P0044 in my Subaru?

- Replacing the oxygen sensor is a common solution for resolving the HO2S13 heater control circuit high code, but it is important to diagnose the issue accurately to ensure that this is the necessary repair.

9. How long does it typically take to repair the OBDII code P0044 in a Subaru?

- The repair time for this code can vary based on the complexity of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the problem.

10. Can the OBDII code P0044 in a Subaru reset itself, or does it require manual clearing after the repair?

- In some cases, the code may clear itself after the underlying issue is resolved. However, it is advisable to use an OBDII scanner to manually clear the code to ensure that the repair was successful.

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