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P0238 Honda Code - Turbocharger Boost Sensor Circuit High Voltage

Quick Answer

The P0238 diagnostic trouble code (DTC) for Honda vehicles indicates a problem with the turbocharger boost sensor circuit registering high voltage. Common causes include Faulty Turbocharger Boost Sensor: A malfunctioning sensor can send incorrect voltage readings to the ECM, triggering the P0238 code, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal transmission, leading to high voltage readings, ECM Malfunction: A problem with the engine control module can also cause the sensor circuit to register high voltage. 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
P0238 Honda indicates Turbocharger Boost Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Turbocharger Boost Sensor: A malfunctioning sensor can send incorrect voltage readings to the ECM, triggering the P0238 code, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal transmission, leading to high voltage readings, ECM Malfunction: A problem with the engine control module can also cause the sensor circuit to register high voltage.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0238 Honda Description

The P0238 diagnostic trouble code (DTC) for Honda vehicles indicates a problem with the turbocharger boost sensor circuit registering high voltage. The turbocharger boost sensor is responsible for monitoring the pressure levels in the intake manifold and providing this information to the engine control module (ECM). When the sensor detects high voltage, it means that the pressure levels are exceeding the normal range, which can lead to various performance issues in the vehicle.

OBDII Code P0238 Honda - Turbocharger Boost Sensor Circuit High Voltage
P0238 Honda Code - Turbocharger Boost Sensor Circuit High Voltage

Common Causes of P0238 Honda

  1. Faulty Turbocharger Boost Sensor: A malfunctioning sensor can send incorrect voltage readings to the ECM, triggering the P0238 code.
  2. Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal transmission, leading to high voltage readings.
  3. ECM Malfunction: A problem with the engine control module can also cause the sensor circuit to register high voltage.
  4. Boost Leak: A leak in the turbocharger system can result in abnormal pressure levels, triggering the code.
  5. Turbocharger Failure: A failing or damaged turbocharger can cause pressure irregularities that affect the sensor readings.

Symptoms of P0238 Honda

  1. Check Engine Light: The most common symptom associated with the P0238 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Power: The vehicle may experience a loss of power or acceleration due to incorrect pressure readings from the turbocharger boost sensor.
  3. Rough Idle: The engine may idle roughly or inconsistently, indicating a problem with the air-fuel mixture.
  4. Poor Fuel Economy: High voltage in the turbocharger boost sensor circuit can lead to inefficient fuel delivery, resulting in decreased fuel economy.
  5. Engine Stalling: In severe cases, the engine may stall or have difficulty starting due to incorrect pressure readings affecting the combustion process.

How to Fix P0238 Honda

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the turbocharger boost sensor, wiring, and connectors.
  2. Replace the Turbocharger Boost Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  3. Repair Wiring or Connectors: Repair or replace any damaged wiring or connectors in the sensor circuit to ensure proper signal transmission.
  4. Check and Repair Boost System: Inspect the turbocharger system for leaks or damage, addressing any issues that may affect pressure levels.
  5. Clear DTCs and Test Drive: Clear the DTC from the ECM memory, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0238 Honda

The typical repair costs for addressing the P0238 code on a Honda vehicle can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often offer lower rates. It is recommended to inquire about local rates for a more accurate estimate of the repair costs.

What does this mean?

Tech Notes for P0238 Honda









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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 P0238 Honda Code

1. What are common symptoms of OBDII code P0238 in a Honda related to the Turbocharger Boost Sensor Circuit High Voltage issue?

- Common symptoms include reduced engine power, hesitation or stalling during acceleration, and the illumination of the Check Engine light.

2. What are some possible causes of the OBDII code P0238 in a Honda?

- The code P0238 in a Honda can be triggered by a faulty turbocharger boost sensor, damaged wiring or connectors in the circuit, or issues with the turbocharger itself.

3. How can I diagnose the Turbocharger Boost Sensor Circuit High Voltage issue in my Honda if I suspect OBDII code P0238?

- To diagnose the issue, you can use a scan tool to read the OBDII code P0238 and check the turbocharger boost sensor's voltage using a multimeter to determine if it is within the specified range.

4. What are the potential risks of driving with the OBDII code P0238 related to the Turbocharger Boost Sensor Circuit High Voltage issue in a Honda?

- Continuing to drive with OBDII code P0238 in a Honda can lead to further damage to the turbocharger system, reduced fuel efficiency, and potential engine performance issues.

5. Can I repair the Turbocharger Boost Sensor Circuit High Voltage issue causing OBDII code P0238 in my Honda myself?

- While some DIY enthusiasts may be able to repair the issue by replacing the turbocharger boost sensor or fixing damaged wiring, it is recommended to seek professional help for accurate diagnosis and repair.

6. How much does it typically cost to repair the Turbocharger Boost Sensor Circuit High Voltage issue causing OBDII code P0238 in a Honda?

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

7. Are there any preventive maintenance tips to avoid encountering the OBDII code P0238 related to the Turbocharger Boost Sensor Circuit High Voltage issue in a Honda?

- Regularly inspecting the turbocharger system, checking for loose or damaged wiring, and maintaining proper engine performance can help prevent the occurrence of OBDII code P0238 in a Honda.

8. How urgent is it to address the Turbocharger Boost Sensor Circuit High Voltage issue causing OBDII code P0238 in a Honda?

- It is advisable to address the issue promptly to prevent further damage to the turbocharger system and ensure optimal engine performance and fuel efficiency.

9. Can a faulty turbocharger itself trigger the OBDII code P0238 related to the Turbocharger Boost Sensor Circuit High Voltage issue in a Honda?

- Yes, a malfunctioning turbocharger can cause the turbocharger boost sensor circuit to generate a high voltage, leading to the triggering of OBDII code P0238 in a Honda.

10. Is it safe to drive my Honda with the Check Engine light on due to the OBDII code P0238 indicating a Turbocharger Boost Sensor Circuit High Voltage issue?

- While you may be able to drive the vehicle for a short distance, it is recommended to have the issue diagnosed and repaired as soon as possible to avoid potential engine damage and performance issues.

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