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Engine-Codes – Generic – P0235

P0235 Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction

Quick Answer

The P0235 diagnostic trouble code (DTC) indicates a malfunction in the Turbocharger/Supercharger Boost Sensor 'A' Circuit. Common causes include Faulty boost sensor, Damaged or corroded wiring in the boost sensor circuit, Loose or disconnected sensor connections. 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
P0235 indicates Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction.
Common causes
Common causes include Faulty boost sensor, Damaged or corroded wiring in the boost sensor circuit, Loose or disconnected sensor connections.
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 07, 2024
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Code P0235 Description

The P0235 diagnostic trouble code (DTC) indicates a malfunction in the Turbocharger/Supercharger Boost Sensor 'A' Circuit. This sensor is responsible for monitoring the boost pressure produced by the turbocharger or supercharger in a vehicle with forced induction. When the sensor detects an abnormal reading or a lack of signal, it triggers the P0235 code, signifying a potential issue with the boost system.

OBDII Code P0235 - Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction
P0235 Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction

Common Causes of P0235

  1. Faulty boost sensor
  2. Damaged or corroded wiring in the boost sensor circuit
  3. Loose or disconnected sensor connections
  4. Issues with the turbocharger or supercharger itself
  5. ECM software or hardware issues

Symptoms of P0235

  1. Loss of engine power
  2. Reduced fuel efficiency
  3. Engine misfires or hesitation
  4. Illuminated check engine light
  5. Rough idling or stalling

How to Fix P0235

  1. Begin by diagnosing the P0235 code using a professional OBD-II scanner to confirm the boost sensor circuit malfunction.
  2. Inspect the boost sensor, wiring, and connections for any visible damage, corrosion, or loose connections.
  3. Test the boost sensor's functionality using a multimeter to ensure it is providing accurate readings.
  4. If the boost sensor is faulty, replace it with a new sensor compatible with your vehicle's make and model.
  5. Clear the DTCs from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0235

The cost estimate for repairing a P0235 code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the parts for a new boost sensor can range from $50 to $200, while labor costs can range from $100 to $300. Additional costs may be incurred if other components in the boost system need to be replaced or repaired. It is advisable to consult a professional mechanic or local auto repair shop for a more accurate cost estimate based on your vehicle's requirements.

When is the Code Detected?

This diagnostic trouble code (DTC) P0235 will set if the boost pressure sensor signal is above the predicted range.

Need more information about the P0235 code?

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Code P0235 Information for Specific Makes

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 P0235 Code

1. What are the common symptoms of OBDII code P0235 (Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction)?

- Common symptoms include a lack of power, reduced engine performance, and potential surging or hesitation during acceleration.

2. What causes the Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction code (P0235)?

- The code is typically triggered by issues such as a faulty boost sensor, damaged wiring or connectors, a disconnected or damaged vacuum hose, or a problem with the turbocharger itself.

3. How can I diagnose the Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction?

- Diagnosing this code usually involves checking the boost sensor, inspecting the wiring and connectors for damage, verifying the integrity of vacuum hoses, and ensuring proper turbocharger operation.

4. Can a dirty air filter cause OBDII code P0235 to trigger?

- Yes, a dirty air filter can lead to restricted airflow and affect turbocharger or supercharger performance, potentially contributing to triggering the P0235 code.

5. Is it safe to continue driving with OBDII code P0235 present?

- It is not recommended to drive with the P0235 code active, as it can lead to further damage to the turbocharger or engine components and potentially result in more severe issues.

6. How can I clear the Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction code?

- Clearing the code typically involves using an OBDII scanner to reset the vehicle's computer after addressing and fixing the underlying issue that triggered the P0235 code.

7. Can a DIY enthusiast repair OBDII code P0235 at home?

- Depending on the cause of the code, some DIY enthusiasts with automotive repair knowledge and tools may be able to address the P0235 code by replacing the boost sensor, repairing wiring, or fixing vacuum hose issues.

8. Will resetting the code make it go away permanently?

- Resetting the code without fixing the underlying issue will not make it go away permanently. The problem causing the P0235 code must be identified and resolved to prevent it from reoccurring.

9. How much does it typically cost to repair OBDII code P0235?

- The cost of repairing the P0235 code can vary depending on the root cause of the issue. Costs may include parts such as a new boost sensor, wiring repairs, or professional diagnostic fees if needed.

10. Is it necessary to visit a mechanic for OBDII code P0235, or can I fix it myself?

- While some individuals may be able to address the P0235 code on their own, consulting a mechanic is advisable, especially if unsure about diagnosing or repairing the issue to prevent further damage or misdiagnosis.

Discuss the causes and fixes for P0235 OBDII Code

Submit a New Comment

  • Hi I have this code, I have changed the boost pressure solenoid and it was working fine for a couple of weeks then it started again ? Same code p0235. In had the turbo cleaned and inspected all's well there iv checked all the hoses for leaks and there all ok ? So now I'm lost help???
    Car is a 2011 Renault Laguna 2.0 dci 150

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