Description of the P0550 fault code.
OBD2 Error Codes

P0550 Power steering pressure sensor circuit malfunction

26.05.2022 /

P0550 – OBD-II Trouble Code Technical Description

Trouble code P0550 indicates a problem with the power steering pressure sensor circuit.

What does the fault code mean P0550?

Trouble code P0550 indicates a problem in the power steering pressure sensor circuit. This code indicates that the vehicle's control system has detected incorrect or missing signals from the pressure sensor, which is responsible for controlling the power steering.

Fault code P0550.

Possible reasons

Some possible reasons for the P0550 trouble code:

  • Faulty pressure sensor: The most common and obvious source of the problem is a malfunction of the pressure sensor itself in the power steering system.
  • Damaged or broken wiring: Damage or breaks in the wiring connecting the pressure sensor to the electronic engine control unit (ECU) can cause the P0550 code to appear.
  • Connectivity issues: Poor connection or oxidation of contacts in the pressure sensor connector or on the ECU can cause the signal to be incorrectly read and an error may occur.
  • Malfunction in the power steering: In some cases, the problem may not be with the pressure sensor itself, but with improper operation of the power steering.
  • Signal wire problems: Insufficient voltage or signal noise on the signal wire can also cause P0550.
  • Problems with the electronic control unit (ECU): In rare cases, faults may be related to the ECU itself, which is not reading the signals from the pressure sensor correctly.

To accurately diagnose and fix the problem, it is recommended to contact a qualified auto mechanic or car service center.

What are the symptoms of a fault code? P0550?

Some possible symptoms that may occur when the P0550 trouble code appears:

  • Difficulty controlling the steering wheel: If the power steering pressure sensor malfunctions, steering wheel control may become difficult or difficult to operate. The steering wheel may feel stiffer when turning or maneuvering.
  • Unusual sounds from the power steering pump: Incorrect operation of the pressure sensor may result in unusual sounds from the power steering pump. There may be a noise or grinding noise when turning the steering wheel.
  • Error on the dashboard: The appearance of a warning light related to power steering or system pressure on the vehicle's dashboard may be one of the symptoms of a malfunction.
  • Increased effort when turning the steering wheel at low speeds: When turning the steering wheel at low speed, the driver may feel increased effort, which may be due to insufficient pressure in the power steering system.
  • Reduced stability and control of the vehicle: Changes in steering control and power steering may affect the vehicle's road holding ability, which may result in decreased vehicle control.
  • Increased fuel consumption: If the power steering system and its pressure are malfunctioning, the vehicle may consume more fuel due to the increased effort required to operate the steering wheel.

It is important to note that symptoms may vary depending on the specific cause of the problem and the characteristics of the vehicle.

How to diagnose a fault code P0550?

The following steps are recommended to diagnose DTC P0550:

  1. Checking for symptoms: First, you need to verify that the vehicle is exhibiting symptoms associated with a faulty power steering pressure sensor. This will help confirm that there is indeed a problem.
  2. Using the Diagnostic Scanner: Using a diagnostic scanner, connect the vehicle to the OBD-II port and check the error codes. If the P0550 code is confirmed, it will indicate a problem with the power steering pressure sensor.
  3. Electrical circuit check: Check the wiring connecting the pressure sensor to the electronic engine control unit (ECU). Make sure the wiring is not damaged, broken or oxidized and that all connections are secure.
  4. Pressure sensor test: Check the power steering pressure sensor itself. This may include checking its resistance or voltage using a multimeter. Replace the sensor if necessary.
  5. Checking the power steering: Check the power steering itself for problems or malfunctions. This may require specialized equipment and knowledge.
  6. Checking the power steering fluid level: Check your power steering fluid level, as low fluid levels can also cause pressure problems and cause the P0550 code to appear.
  7. Error code reset and testing: After fixing the problem, reset the error code using the diagnostic scanner. Then test drive the vehicle to make sure the problem is resolved and the error code no longer appears.

If you do not have the necessary equipment or experience to perform diagnostics and repairs, it is recommended that you contact a qualified auto mechanic or auto repair shop.

Diagnostic errors

When diagnosing DTC P0550, the following errors may occur:

  • Insufficient wiring check: Failed or incomplete wiring testing can lead to undiagnosed problems with opens, shorts, or oxidized wires, which may be the source of the P0550 code.
  • Faulty pressure sensor diagnosis: Failure to diagnose the pressure sensor itself may lead to an erroneous conclusion about its condition. Misinterpretation of test results or misinterpretation of signals can lead to sensor replacement when the problem may be elsewhere.
  • Ignoring other possible causes: By focusing only on the pressure sensor, you may miss other possible causes of the P0550 code, such as problems with the power steering, insufficient fluid levels in the system, or problems with the electronic control unit.
  • Lack of attention to detail: Irreversible failure to pay attention to small details, such as the condition of connectors or ensuring sufficient wiring protection, can lead to incorrect conclusions and additional problems in the future.
  • No error code reset after repair: After fixing the problem, it is necessary to reset the error code from the memory of the engine control unit. If this step is skipped, the error code will continue to be displayed on the instrument panel even if the problem has already been resolved.

When carrying out diagnostics, it is important to be attentive to details, check all possible causes of the malfunction and make sure that the problem is solved completely and correctly.

How serious is the fault code? P0550?

Trouble code P0550 can be serious, especially if it causes difficulty in driving due to insufficient or incorrect steering effort. Possible power steering problems may affect your driving safety and vehicle control, especially when maneuvering or parking at low speeds.

However, if the problem is only related to the power steering pressure sensor, then it most likely will not cause any immediate danger on the road. However, even such problems should be taken seriously as they can lead to increased steering effort and poor handling, especially in critical driving situations.

In general, the severity of a P0550 code depends on the specific circumstances and cause of the problem. If you notice this error on your dashboard, it is recommended that you immediately contact a qualified auto mechanic to diagnose and repair the problem.

What repair will help eliminate the code? P0550?

Troubleshooting the P0550 trouble code may include the following:

  1. Checking and replacing the pressure sensor: If the power steering pressure sensor is faulty or damaged, it must be replaced. This may require access to the power steering and some technical procedures.
  2. Checking and repairing wiring: Check the wiring connecting the pressure sensor to the electronic engine control unit (ECU). If damage, breaks or oxidation of the wires is detected, they must be repaired or replaced.
  3. Checking and replacing power steering: If the problem is with the power steering itself, it may need to be replaced or repaired. This may require special tools and automotive repair experience.
  4. Checking and topping up the fluid level in the power steering system: Check the power steering fluid level. If the fluid level is too low, top it up to the required level. Low fluid levels can also cause a P0550 code.
  5. Resetting the error code: After fixing the problem, reset the error code using the diagnostic scanner. This will allow the fault record to be deleted from the memory of the engine control unit and the vehicle to return to normal operation.

If you do not have the necessary equipment or experience to perform these steps, it is recommended that you contact a qualified auto mechanic or auto repair shop for professional diagnosis and repair.

What is P0550 Engine Code [Quick Guide]

P0550 – Brand-specific information

Trouble code P0520 relates to the engine management system and can be common to different makes of vehicles. It is related to a problem with the oil pressure sensor. Below is a list of car brands with their decodings:

Please remember that the transcripts may vary slightly depending on the model and year of the vehicle. If you are experiencing trouble code P0520, it is recommended that you contact your dealer or certified auto repair shop for more accurate diagnosis and repair.

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