AutoCodes – Volvo – P0238 Volvo

P0238 Volvo Code - Boost Pressure Sensor Signal Too High

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 Volvo indicates Boost Pressure Sensor Signal Too High.
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 14,447

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 Jul 11, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0238 Volvo 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 Volvo - Boost Pressure Sensor Signal Too High - AutoCodes.com — P0238 Volvo Code - Boost Pressure Sensor Signal Too High

What does this mean?

What are the Possible Causes of the DTC P0238 Volvo?

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 Volvo?

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 Volvo 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 Volvo Code

1. What are the common symptoms of OBDII code P0238 in a Volvo related to the Boost Pressure Sensor Signal Too High?

- Common symptoms include reduced engine power, poor acceleration, rough idling, and potential stalling of the vehicle.

2. What are the possible causes of the Boost Pressure Sensor Signal Too High error code in a Volvo?

- Causes may include a faulty boost pressure sensor, issues with the turbocharger, damaged vacuum lines, or a problem with the engine control module (ECM).

3. How can I diagnose the Boost Pressure Sensor Signal Too High issue in my Volvo?

- You can diagnose the problem by using an OBDII scanner to read the fault codes, visually inspecting the boost pressure sensor and related components, and testing the sensor's voltage output.

4. What are some recommended repair tips for fixing OBDII code P0238 in a Volvo?

- Repair tips may include replacing the boost pressure sensor, checking and repairing any damaged vacuum lines, ensuring proper turbocharger operation, and resetting the ECM after repairs.

5. Can driving with the Boost Pressure Sensor Signal Too High error code in a Volvo cause further damage to the vehicle?

- Continuing to drive with this issue can potentially cause damage to the engine, turbocharger, or other related components, so it is recommended to address the problem promptly.

6. Is it safe to clear the OBDII code P0238 related to the Boost Pressure Sensor Signal Too High without fixing the underlying issue?

- Clearing the code without addressing the root cause may temporarily eliminate the warning light, but it will not solve the actual problem and could lead to ongoing performance issues.

7. How much does it typically cost to repair the Boost Pressure Sensor Signal Too High error code in a Volvo?

- Repair costs can vary depending on the specific cause of the issue, but expenses may include parts such as a new boost pressure sensor and labor for diagnosis and installation.

8. Are there any preventive measures to avoid encountering the Boost Pressure Sensor Signal Too High problem in a Volvo?

- Regularly scheduled maintenance, including checking and replacing worn components, monitoring turbocharger performance, and using high-quality fuel, can help prevent this issue.

9. Can a DIY enthusiast with basic automotive knowledge fix the Boost Pressure Sensor Signal Too High error code in a Volvo?

- Depending on the cause of the problem, some DIY enthusiasts may be able to address the issue themselves by following repair guides or tutorials for replacing the boost pressure sensor or related components.

10. How long does it typically take to repair the Boost Pressure Sensor Signal Too High error code in a Volvo at a professional auto repair shop?

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