AutoCodes – Mercedes-Benz – P0237 Mercedes-Benz

P0237 Mercedes-Benz Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Low

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: P0237 Mercedes-Benz indicates Turbocharger/Supercharger Boost Sensor 'A' Circuit Low.
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.

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Code Popularity 28,095

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0237 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 P0237 Mercedes-Benz - Turbocharger/Supercharger Boost Sensor 'A' Circuit Low - AutoCodes.com — P0237 Mercedes-Benz Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0237 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 P0237 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 P0237 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 P0237 Mercedes-Benz code?

Need more information on how to fix the P0237 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the 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 P0237 Mercedes-Benz Code

1. What are common symptoms of OBDII code P0237 in a Mercedes-Benz related to the Turbocharger/Supercharger Boost Sensor 'A' Circuit Low?

- Common symptoms include reduced engine power, poor acceleration, hesitation or stalling, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P0237 in a Mercedes-Benz?

- Possible causes can include a faulty turbocharger or supercharger boost sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the Turbocharger/Supercharger Boost Sensor 'A' Circuit Low issue in my Mercedes-Benz?

- Diagnosing this issue typically involves using a scan tool to read the OBDII code, checking the sensor's wiring and connectors for any damage, and testing the sensor's functionality using a multimeter.

4. Can driving with OBDII code P0237 in a Mercedes-Benz cause further damage to the vehicle?

- Continuing to drive with this code can potentially lead to engine damage due to improper air-fuel mixture or overboost conditions, so it is recommended to address the issue promptly.

5. Is it safe to clear the OBDII code P0237 in a Mercedes-Benz without fixing the underlying issue?

- Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the underlying problem will persist and can lead to further issues down the road.

6. What are some repair tips for fixing OBDII code P0237 in a Mercedes-Benz?

- Repair tips may include replacing the turbocharger or supercharger boost sensor, repairing or replacing damaged wiring or connectors, and ensuring proper connections and sensor functionality.

7. Can a DIY enthusiast fix OBDII code P0237 in a Mercedes-Benz, or is professional help recommended?

- While some experienced DIY enthusiasts may be able to address this issue themselves, it is generally recommended to seek professional help to accurately diagnose and repair the Turbocharger/Supercharger Boost Sensor 'A' Circuit Low problem.

8. How much does it cost to repair OBDII code P0237 in a Mercedes-Benz at a dealership or a repair shop?

- The cost of repairing this code can vary depending on the specific cause of the issue, but it may involve parts and labor costs for sensor replacement, wiring repairs, or ECM diagnostics.

9. Are there any preventive maintenance measures to avoid OBDII code P0237 in a Mercedes-Benz?

- Regularly inspecting and maintaining the turbocharger or supercharger system, checking sensor connections, and addressing any performance issues promptly can help prevent the occurrence of this code.

10. Can extreme weather conditions or driving habits contribute to triggering OBDII code P0237 in a Mercedes-Benz?

- Extreme weather conditions or aggressive driving habits that put additional stress on the turbocharger or supercharger system can potentially contribute to triggering this code, so it's important to drive responsibly and maintain the vehicle properly.