P0556 code — how to fix error fast

If you spot the P0556 code during a diagnostic scan of your vehicle, you should immediately stop what you are doing and focus on solving the code. We know it sounds urgent, and it quite frankly is – the code P0556 can endanger your driving safety, so it’s crucial to repair the issue behind the code right away.

For all those of you that aren’t familiar with OBD2 codes, our team wanted to give you a complete brief on P0556 code meaning and how it affects your ride. So, follow this guide as a lead into the code and ways of diagnosing, as well as fixing it.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P0556 code mean?

The P0556 code is related to the power steering pressure sensor circuit range/performance. It is a diagnostic trouble code (DTC) that indicates a potential issue with the power steering system. It’s important to understand this code because it can affect the safety and performance of the vehicle.

If the code appears, you may be in danger of losing the power steering function and this gets especially dangerous while driving at highway speeds. If you aren’t used to driving an older car that didn’t have power steering, failing to fix this code on time can result in potentially dangerous driving situations.

What causes the P0556 code?

The P0556 code can have several potential causes, including a faulty power steering pressure sensor, damaged wiring, or a malfunctioning power steering control module. Let’s take a closer look at each of these potential causes and their associated symptoms.

Faulty power steering pressure sensor

The power steering pressure sensor is responsible for monitoring the pressure in the power steering system and sending this information to the power steering control module. If this sensor is faulty, it can result in the P0556 code being triggered. Symptoms of a faulty power steering pressure sensor can include difficulty steering, inconsistent power steering assist, and a whining noise coming from the power steering pump.

Damaged wiring

Damage to the wiring that connects the power steering pressure sensor to the power steering control module can also cause the P0556 code. This damage can be the result of wear and tear, corrosion, or exposure to the elements. Symptoms of damaged wiring can include intermittent power steering assist, inconsistent power steering assist, and a loss of power steering altogether.

Malfunctioning power steering control module

The power steering control module is responsible for receiving the information from the power steering pressure sensor and adjusting the power steering assist as needed. If this module is malfunctioning, it can cause the P0556 code to be triggered. Symptoms of a malfunctioning power steering control module can include difficulty steering, inconsistent power steering assist, and a loss of power steering altogether.

Which car models does the P0556 code affect the most?

This fault can be observed in different car models, but some models are more susceptible than others. Some of the car models that are most likely to be affected by the code P0556 include:

• BMW X5: The BMW X5 is known to experience issues with the power steering pressure sensor circuit, which may trigger the P0556 code. This issue can cause the vehicle to lose power steering assistance, making it difficult to maneuver at low speeds.
• Ford F-150: The Ford F-150 has also been known to experience problems with the power steering pressure sensor circuit, leading to the activation of the P0556 code. Drivers may notice difficulty steering or a decrease in power steering assist when this fault occurs.
• Honda Odyssey: Some Honda Odyssey models have been reported to have issues with the power steering pressure sensor circuit, causing the P0556 code to appear on the dashboard. This can result in a loss of power steering assistance, making it challenging to turn the wheel.

How to diagnose the P0556 code

If there’s an issue with the car’s power steering system or the power steering circuit, there are ways of determining the root cause of that issue. We’ll only list the most effective ways here as these diagnostic methods can clearly indicate a problem behind the code P0556:

Examine the power steering system

The first step in diagnosing the P0556 code is usually a visual inspection of the vehicle’s power steering system. This can involve checking for damaged hoses, loose connections, or leaks that could cause a drop in pressure.

Using an OBD2 tool

A scan tool is used to retrieve diagnostic trouble codes (DTCs) from the OBD-II system. This tool can also be used to view live data from various sensors, including the power steering pressure sensor. Mechanics can use this data to determine if the sensor is functioning correctly or if there are any other issues with the power steering system, and you can use it as well if you find an affordable scanner tool.

Multimeter testing

A multimeter can be used to test the voltage and resistance of the power steering pressure sensor circuit. This can help mechanics determine if there are any electrical problems that could be causing the P0556 code.

Checking the pressure gauge of the power steering system

A pressure gauge can be attached to the power steering system to measure the actual pressure being generated by the pump. If the pressure is lower than it should be, this could indicate a problem with the power steering pressure sensor circuit.

How to fix the P0556 code

Fixing the P0556 code will depend on the underlying cause of the issue. Here are the steps you’ll need to follow to fix the code:

Replace the power steering pressure switch

If the power steering pressure switch is found to be faulty, replacing it can fix the P0556 code. This involves removing the old switch and installing a new one.

Repair damaged wiring

If there is damage to the wiring or connectors in the power steering pressure sensor circuit, this can cause the P0556 code to appear. In this case, repairing or replacing damaged components can fix the issue.

Replace the power steering pump

In some cases, a faulty power steering pump can cause issues with the power steering pressure sensor circuit and trigger the P0556 code. In this case, replacing the pump may be necessary to fix the problem.

How to prevent the P0556 code

Preventing the P0556 code requires routine maintenance of the power steering system. Here are some preventative measures you can take:

• Regularly inspect the power steering pressure sensor and its wiring for any visible damage.
• Perform routine maintenance on the power steering system, including fluid changes and inspections.
• Avoid driving on rough terrain or hitting large potholes, which can damage the power steering system.
• Seek professional help if you suspect there may be an issue with your power steering system.

By following these preventative measures and performing routine maintenance, you can help prevent the P0556 code from occurring in the future.

Our take

In the end, if you truly fix the code P0556 by taking a deeper look into the problem that caused it, you can avoid having issues with the power steering system of your car. If you don’t deal with it on time, it can lead to some serious safety issues and concerns, so our team hopes you’ll repair the damage before it becomes too severe by using the pieces of information listed in this guide.