AutoCodes – Mercedes-Benz – P0235 Mercedes-Benz

P0235 Mercedes-Benz Code - Turbocharger Boost Sensor A Circuit Malfunction

Quick Answer

The boost pressure sensor responds to pressure changes in the intake manifold. Common causes include Boost pressure sensor harness is open or shorted, Boost pressure sensor circuit poor electrical connection, Faulty boost pressure sensor. 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 Mercedes-Benz indicates Turbocharger Boost Sensor A Circuit Malfunction .
Common causes
Common causes include Boost pressure sensor harness is open or shorted, Boost pressure sensor circuit poor electrical connection, Faulty boost pressure sensor.
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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 10,058
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0235 Mercedes-Benz 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 diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The Engine Control Module (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.
OBDII Code P0235 Mercedes-Benz - Turbocharger Boost Sensor A Circuit Malfunction  - AutoCodes.com
P0235 Mercedes-Benz Code - Turbocharger Boost Sensor A Circuit Malfunction

What are the Possible Causes of the DTC P0235 Mercedes-Benz?

  • Boost pressure sensor harness is open or shorted
  • Boost pressure sensor circuit poor electrical connection
  • Faulty boost pressure sensor
  • Faulty Turbo/Super Charger
  • Engine over temperature
  • Ignition misfire exceeds the calibrated threshold
  • Faulty Knock sensor (KS)

How to Fix the DTC P0235 Mercedes-Benz?

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 P0235 Mercedes-Benz 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 P0235 Mercedes-Benz code?

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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 P0235 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0235 in a Mercedes-Benz related to the Turbocharger Boost Sensor A Circuit Malfunction?

- Common symptoms include loss of power, reduced fuel efficiency, hesitation or surging during acceleration, and the illumination of the check engine light.

2. What are some possible causes of the Turbocharger Boost Sensor A Circuit Malfunction code P0235 in a Mercedes-Benz?

- Possible causes include a faulty boost sensor, damaged wiring or connectors in the circuit, a boost sensor that is not properly calibrated, or issues with the turbocharger system.

3. How can I diagnose the Turbocharger Boost Sensor A Circuit Malfunction in my Mercedes-Benz with OBDII code P0235?

- Diagnosis typically involves using a scan tool to read the fault codes, checking the boost sensor and its wiring for physical damage, and testing the sensor's functionality and calibration.

4. Is it safe to continue driving my Mercedes-Benz with the P0235 code indicating a Turbocharger Boost Sensor A Circuit Malfunction?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the turbocharger system and potentially cause engine issues.

5. Can I reset the OBDII code P0235 in my Mercedes-Benz without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause of the Turbocharger Boost Sensor A Circuit Malfunction to prevent further problems.

6. How much does it typically cost to repair the Turbocharger Boost Sensor A Circuit Malfunction in a Mercedes-Benz with OBDII code P0235?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve replacing the boost sensor, repairing wiring or connectors, or addressing turbocharger system problems.

7. Are there any DIY tips for troubleshooting the Turbocharger Boost Sensor A Circuit Malfunction in a Mercedes-Benz?

- DIY tips include visually inspecting the boost sensor and its wiring for any obvious damage, checking for loose connections, and verifying the sensor's calibration if possible.

8. Can a faulty Turbocharger Boost Sensor A Circuit Malfunction code P0235 affect the overall performance of my Mercedes-Benz?

- Yes, a faulty boost sensor can negatively impact the turbocharger system's performance, leading to reduced power, decreased fuel efficiency, and potential drivability issues.

9. How long does it typically take to repair the Turbocharger Boost Sensor A Circuit Malfunction in a Mercedes-Benz?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day for diagnosis, replacement, or repair of the sensor and related components.

10. Is the Turbocharger Boost Sensor A Circuit Malfunction code P0235 a common issue in Mercedes-Benz vehicles?

- While not extremely common, this code can occur in Mercedes-Benz vehicles, especially in models equipped with turbocharged engines. Regular maintenance and timely repairs can help prevent this issue.

Discuss the causes and fixes for P0235 Mercedes-Benz OBDII Code

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