AutoCodes – Mercedes-Benz – P0551 Mercedes-Benz

P0551 Mercedes-Benz Code - Power Steering Pressure Sensor Circuit Range/Performance

Quick Answer

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. Common causes include Faulty Power Steering Pressure Sensor, Power Steering Pressure Sensor harness is open or shorted, Power Steering Pressure Sensor circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0551 Mercedes-Benz indicates Power Steering Pressure Sensor Circuit Range/Performance.
Common causes: Common causes include Faulty Power Steering Pressure Sensor, Power Steering Pressure Sensor harness is open or shorted, Power Steering Pressure Sensor circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 3,832

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 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 P0551 Mercedes-Benz Description

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the Engine Control Module (ECM). The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

OBDII Code P0551 Mercedes-Benz - Power Steering Pressure Sensor Circuit Range/Performance - AutoCodes.com — P0551 Mercedes-Benz Code - Power Steering Pressure Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0551 Mercedes-Benz?

Faulty Power Steering Pressure Sensor
Power Steering Pressure Sensor harness is open or shorted
Power Steering Pressure Sensor circuit poor electrical connection

How to Fix the DTC P0551 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 P0551 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 P0551 Mercedes-Benz code?

Need more information on how to fix the P0551 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0551 Mercedes-Benz 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 P0551 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0551 in a Mercedes-Benz related to the power steering pressure sensor circuit?

- Common symptoms include hard steering, stiff steering wheel, power steering failure, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code P0551 in a Mercedes-Benz?

- The code P0551 in a Mercedes-Benz can be triggered by issues such as a faulty power steering pressure sensor, damaged wiring or connectors, low power steering fluid, or a malfunctioning power steering pump.

3. How can I diagnose the OBDII code P0551 in my Mercedes-Benz?

- Diagnosis involves using an OBDII scanner to read the code, checking the power steering pressure sensor and related components for damage, and testing the wiring and connectors for continuity and proper voltage.

4. What are the repair options for fixing OBDII code P0551 in a Mercedes-Benz?

- Repair options may include replacing the power steering pressure sensor, repairing or replacing damaged wiring and connectors, ensuring proper power steering fluid levels, and checking the power steering pump for proper operation.

5. Can I drive my Mercedes-Benz with OBDII code P0551?

- It is not recommended to drive your Mercedes-Benz with OBDII code P0551, as it can lead to potential safety hazards due to power steering issues. It is best to address the problem promptly.

6. How much does it cost to repair OBDII code P0551 in a Mercedes-Benz?

- The cost of repairing OBDII code P0551 in a Mercedes-Benz can vary depending on the exact cause of the issue, the parts needed for replacement, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

7. Can a DIY enthusiast fix OBDII code P0551 in a Mercedes-Benz?

- While some experienced DIY enthusiasts may be able to diagnose and repair OBDII code P0551 in a Mercedes-Benz, it is recommended to seek assistance from a qualified mechanic due to the complexity of power steering system components.

8. How urgent is it to address OBDII code P0551 in a Mercedes-Benz?

- It is important to address OBDII code P0551 in a Mercedes-Benz promptly to avoid potential safety risks associated with power steering failure. Delaying repairs can lead to more severe issues and higher repair costs.

9. Will resetting the OBDII code P0551 in a Mercedes-Benz make the problem go away?

- Resetting the OBDII code P0551 may temporarily turn off the warning light, but it will not fix the underlying issue causing the code. It is essential to diagnose and repair the root cause of the problem.

10. Is OBDII code P0551 specific to Mercedes-Benz vehicles only?

- While OBDII code P0551 is related to the power steering pressure sensor circuit, it can be found in various vehicle makes and models, not exclusive to Mercedes-Benz.