AutoCodes – Ford – P0238 Ford

P0238 Ford Code - Turbo/Boost Sensor 'A' Circuit High Input

Quick Answer

The Boost Pressure Sensor responds to pressure changes in the intake manifold. Common causes include Faulty Boost Pressure Sensor, Boost Pressure Sensor harness is open or shorted, Boost Pressure 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 Ford indicates Turbo/Boost Sensor 'A' Circuit High Input.
Common causes: Common causes include Faulty Boost Pressure Sensor, Boost Pressure Sensor harness is open or shorted, Boost Pressure 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 52,763

How popular is this code, among other codes? Medium

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0238 Ford Description

The Boost Pressure Sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with Accelerator Pedal Position (APP) and engine speed. The Engine Control Module (ECM) uses this information to assist in the diagnosis of the Barometric Pressure (BARO) sensor and to provide engine over-boost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost pressure sensor signal for voltage outside of the normal range. The ECM calculates a predicted value for the boost pressure sensor. The ECM then compares the predicted value to the actual signal. This Diagnostic Trouble Code (DTC) P0238 will set if the boost pressure sensor signal is above the predicted range.

OBDII Code P0238 Ford - Turbo/Boost Sensor 'A' Circuit High Input - AutoCodes.com — P0238 Ford Code - Turbo/Boost Sensor 'A' Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0238 Ford?

Faulty Boost Pressure Sensor
Boost Pressure Sensor harness is open or shorted
Boost Pressure Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)
Engine over temperature

How to Fix the DTC P0238 Ford?

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

There is a factory service bulletin for the following Ford models:

2003-2007 Ford F-Super Duty
2004-2007 Ford E-350, E-450
2003-2005 Ford Excursion
Ford Factory Service Bulletin OBDII Code P0238

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0238 Ford 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.

Need more information about the P0238 Ford code?

Need more information on how to fix the P0238 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0238 Ford code diagnosed by a professional: Find a repair shop in your area

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 Ford Code

1. What are the common symptoms of OBDII code P0238 in a Ford related to the Turbo/Boost Sensor 'A' Circuit High Input?

Symptoms may include engine performance issues such as loss of power, rough idling, hesitation during acceleration, and in some cases, the vehicle going into "limp mode".

2. What typically causes the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in a Ford?

Common causes of this code include a faulty turbocharger boost sensor, damaged wiring or connectors in the sensor circuit, or a problem with the sensor's signal.

3. How can I diagnose the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in my Ford?

Diagnosis usually involves checking the turbo boost sensor for proper operation, inspecting the wiring and connectors for any damage, and testing the sensor's signal using a multimeter.

4. Can a dirty air filter trigger the OBDII code P0238 related to the Turbo/Boost Sensor 'A' Circuit High Input in a Ford?

Yes, a dirty air filter can restrict airflow to the engine, leading to abnormal boost levels and potentially triggering the P0238 code.

5. Is it safe to continue driving my Ford with the Turbo/Boost Sensor 'A' Circuit High Input code P0238?

It is not recommended to drive your vehicle with the P0238 code present, as it can lead to further damage to the engine or turbo system. It's best to address the issue promptly.

6. How can I reset the OBDII code P0238 related to the Turbo/Boost Sensor 'A' Circuit High Input in my Ford?

You can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, the underlying issue causing the code should still be addressed.

7. Will replacing the turbocharger fix the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in my Ford?

While a faulty turbocharger can sometimes trigger this code, it's essential to diagnose the specific cause accurately before replacing any parts. The issue could also be related to the sensor or wiring.

8. Can a bad MAP sensor cause the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in a Ford?

Yes, a malfunctioning Manifold Absolute Pressure (MAP) sensor can disrupt the turbocharger's boost control system, leading to the P0238 code being triggered.

9. Are there any DIY repair tips for fixing the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in a Ford?

DIY repair tips may include checking and cleaning sensor connectors, inspecting wiring for damage, and ensuring proper sensor operation before considering replacement.

10. How much does it cost to repair the Turbo/Boost Sensor 'A' Circuit High Input code P0238 in a Ford?

The cost of repair can vary depending on the specific issue causing the P0238 code. It may range from a simple sensor replacement to more extensive repairs involving the turbo system.