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Engine-Codes – Nissan – P0038 Nissan

P0038 Nissan Code - HO2S12 Heater Control Circuit High

Quick Answer

The P0038 diagnostic trouble code (DTC) for Nissan vehicles refers to the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) Heater Control Circuit High. Common causes include Faulty Oxygen Sensor: The most common cause of the P0038 code is a malfunctioning downstream oxygen sensor, Wiring Issues: Damaged or corroded wiring in the heater control circuit can prevent the sensor from receiving the necessary voltage, ECM Malfunction: A problem with the engine control module can also trigger this code. 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
P0038 Nissan indicates HO2S12 Heater Control Circuit High.
Common causes
Common causes include Faulty Oxygen Sensor: The most common cause of the P0038 code is a malfunctioning downstream oxygen sensor, Wiring Issues: Damaged or corroded wiring in the heater control circuit can prevent the sensor from receiving the necessary voltage, ECM Malfunction: A problem with the engine control module can also trigger this code.
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 12, 2024
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Code P0038 Nissan Description

The P0038 diagnostic trouble code (DTC) for Nissan vehicles refers to the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) Heater Control Circuit High. This code indicates that the engine control module (ECM) has detected a high voltage condition in the heater control circuit of the downstream oxygen sensor located after the catalytic converter. The heater control circuit is responsible for ensuring that the oxygen sensor reaches and maintains the optimal operating temperature quickly, allowing it to accurately measure the oxygen content in the exhaust gases.

OBDII Code P0038 Nissan - HO2S12 Heater Control Circuit High
P0038 Nissan Code - HO2S12 Heater Control Circuit High

Common Causes of P0038 Nissan

  1. Faulty Oxygen Sensor: The most common cause of the P0038 code is a malfunctioning downstream oxygen sensor.
  2. Wiring Issues: Damaged or corroded wiring in the heater control circuit can prevent the sensor from receiving the necessary voltage.
  3. ECM Malfunction: A problem with the engine control module can also trigger this code.
  4. Blown Fuse: A blown fuse in the oxygen sensor heater circuit can cause the high voltage condition.
  5. Exhaust System Leak: An exhaust leak near the downstream oxygen sensor can affect its performance and trigger the code.

Symptoms of P0038 Nissan

  1. Check Engine Light: The most common symptom associated with the P0038 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning oxygen sensor heater can lead to incorrect fuel mixture adjustments, resulting in reduced fuel efficiency.
  3. Rough Idle: The engine may experience rough idling or hesitation when the oxygen sensor is not functioning properly.
  4. Failed Emissions Test: If the downstream oxygen sensor is not providing accurate readings, the vehicle may fail emissions testing.
  5. Engine Misfires: In severe cases, a faulty HO2S12 heater control circuit can cause engine misfires or poor engine performance.

How to Fix P0038 Nissan

  1. Diagnose the Issue: Use a scan tool to retrieve the trouble codes and perform a thorough inspection of the oxygen sensor and its wiring.
  2. Replace Oxygen Sensor: If the downstream oxygen sensor is faulty, replace it with a new sensor that meets the manufacturer's specifications.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as needed.
  4. Test Heater Circuit: Verify the operation of the heater circuit by checking for proper voltage and resistance.
  5. Clear Codes: After completing the repairs, clear the trouble codes from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0038 Nissan

The cost of repairing a P0038 code on a Nissan vehicle can vary depending on the specific model and year of the vehicle, as well as the location and labor rates of the auto repair shop. In general, the cost of replacing an oxygen sensor can range from $150 to $400, including parts and labor. Additional costs may apply if there are wiring issues or other components that need to be replaced. It's recommended to contact local auto repair shops for a more accurate estimate based on your vehicle's specific needs. Keep in mind that diagnostic time and labor rates can impact the final cost of the repair.

When is the Code Detected?

The P0038 is set when the ECM detects an excessively high voltage through the heated oxygen sensor heater circuit

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Information for Specific Nissan Models

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.

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