AutoCodes – Nissan – P0238 Nissan

P0238 Nissan Code - Turbocharger Boost Sensor Circuit High

Quick Answer

Depending on driving conditions, the Engine Control Module (ECM) performs ON/OFF duty control of the turbocharger boost control solenoid valve and controls the boost by adjusting the pressure to the diaphragm of the boost control actuator. Common causes include Faulty Turbocharger Boost Sensor, Turbocharger Boost Sensor harness is open or shorted, Turbocharger Boost Sensor 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: P0238 Nissan indicates Turbocharger Boost Sensor Circuit High.
Common causes: Common causes include Faulty Turbocharger Boost Sensor, Turbocharger Boost Sensor harness is open or shorted, Turbocharger Boost Sensor 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 17,544

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 Aug 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0238 Nissan Description

Depending on driving conditions, the Engine Control Module (ECM) performs ON/OFF duty control of the turbocharger boost control solenoid valve and controls the boost by adjusting the pressure to the diaphragm of the boost control actuator. When driving conditions demand an increase in boost, the ECM prolongs the ON time of the turbocharger boost control solenoid valve and moves the boost control valve towards the closing direction by reducing the pressure in the diaphragm of the boost control actuator. The emission gas to the turbine wheel is then increased. When driving conditions demand a decrease in boost, the ECM shortens the ON time of the turbocharger boost control solenoid valve and moves the boost control valve towards the opening position by increasing the pressure in the diaphragm of the boost control actuator. The emission bypassing to the turbine wheel is then increased. Thus, by performing the most optimal boost control, the ECM improves engine output and response.

OBDII Code P0238 Nissan - Turbocharger Boost Sensor Circuit High - AutoCodes.com — P0238 Nissan Code - Turbocharger Boost Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0238 Nissan?

Faulty Turbocharger Boost Sensor
Turbocharger Boost Sensor harness is open or shorted
Turbocharger Boost Sensor circuit poor electrical connection
Faulty Fuel rail pressure sensor
Faulty Battery current sensor

How to Fix the DTC P0238 Nissan?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0238 Nissan 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 P0238 Nissan Code

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

- Common symptoms include reduced engine power, excessive black smoke from the exhaust, and potential turbocharger issues.

2. What are the possible causes of the Turbocharger Boost Sensor Circuit High code P0238 in a Nissan?

- The code can be triggered by a faulty boost pressure sensor, wiring issues, a defective turbocharger, or a problem with the engine control module.

3. How can I diagnose the Turbocharger Boost Sensor Circuit High code P0238 in my Nissan?

- Diagnose by checking the boost pressure sensor for proper operation, inspecting the wiring for any damage or loose connections, and ensuring the turbocharger is functioning correctly.

4. Can a dirty air filter cause OBDII code P0238 in a Nissan?

- Yes, a dirty air filter restricting airflow to the engine can lead to insufficient boost pressure, triggering the P0238 code.

5. Is it safe to continue driving with the Turbocharger Boost Sensor Circuit High code P0238 in my Nissan?

- It is not recommended to drive with this code as it can lead to further engine damage and potential turbocharger issues.

6. How can I reset the OBDII code P0238 in my Nissan after making repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes to clear the error code.

7. Are there any DIY repair tips for fixing the Turbocharger Boost Sensor Circuit High code P0238 in a Nissan?

- DIY repair tips include checking and cleaning the boost pressure sensor, inspecting the wiring harness for damage, and ensuring proper turbocharger function.

8. Can a mechanic help me fix the Turbocharger Boost Sensor Circuit High code P0238 in my Nissan?

- Yes, a qualified mechanic can diagnose the issue accurately, replace any faulty components, and ensure proper repair of the turbocharger system.

9. What is the typical cost to repair OBDII code P0238 related to the Turbocharger Boost Sensor Circuit High in a Nissan?

- The repair cost can vary depending on the exact cause, but it may involve replacing the boost pressure sensor, repairing wiring issues, or addressing turbocharger problems, with costs ranging from $100 to $500 or more.

10. How often should I check the turbocharger system in my Nissan to prevent OBDII code P0238 from occurring?

- It is recommended to have the turbocharger system inspected during regular maintenance intervals or if you notice any symptoms of reduced engine performance or abnormal exhaust smoke.