Fault code P0550 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0550 – Power Steering Pressure Sensor Circuit Malfunction

P0550: Causes, signs and repairs

Error code P0550 is displayed and the check engine light is on - what does this mean?

The DTC P0550 is triggered by the OBD/EOBD system when a fault is detected in the power steering system. This fault code indicates problems with the power steering pressure sensor or the power steering electrical circuit.

What can cause this fault code?

Defective power steering pressure sensor
Damaged wiring to the pressure sensor
Corroded or loose plug connections
Low power steering fluid level
Defective power steering pump
Clogged power steering filter
Faulty control unit software

What symptoms occur in parallel with fault code P0550?

Sluggish steering: The steering wheel can only be moved with increased effort
Unusual noises: Squeaking or howling when steering, especially when parking
Jerky steering: The steering feels uneven or rough
Increased fuel consumption: The engine has to work harder to support the power steering
Warning lights: In addition to the check engine light, a power steering warning may also come on

How to fix the problem of error code P0550?

Repairing error code P0550 requires a systematic diagnosis of the power steering components.
Check the power steering fluid level and top up if necessary, checking for leaks in the system
Replace the power steering pressure sensor if it is defective or provides incorrect values
Check the wiring and plug connections to the pressure sensor for damage, corrosion or loose contacts and repair them
Replace the power steering pump if it does not build up the required pressure or has mechanical defects
Change the power steering filter and flush the entire system to remove impurities
Update the control unit software or have the control unit reprogrammed

FAQ - Frequently asked questions about DTC P0550

Can I continue driving with error code P0550?

In principle, driving is possible, but not recommended. The steering becomes more sluggish, which is particularly problematic at low speeds and when parking. If the power steering fails completely, driving safety can be significantly impaired.

How much does it cost to repair error code P0550?

The repair costs vary depending on the cause: a new pressure sensor costs around 50-150 euros, a power steering pump 200-500 euros. The labor costs are around 80-150 euros per hour. In total, the costs can be between 150 and 800 euros.

How do I recognize a defective power steering pressure sensor on P0550?

A defective sensor is indicated by fluctuating steering force, unusual noises when steering and activation of the engine control light. The sensor values can be checked in real time using an OBD scanner.

Can a low power steering fluid level trigger P0550?

Yes, too low a fluid level can cause error code P0550. The pressure sensor detects insufficient system pressure and reports this to the control unit. It is important to check the fluid level regularly.

Is P0550 a manufacturer-specific trouble code?

No, P0550 is a standardized EOBD code that has the same meaning for all vehicle manufacturers. However, the specific repair procedures may vary depending on the manufacturer and model.

How often does fault code P0550 occur?

P0550 is a relatively rare fault code that mainly occurs in older vehicles with hydraulic power steering. Modern vehicles with electric power steering are less affected, but can develop similar codes in other areas.

Vehicles in which fault code P0550 occurs most frequently

Fault code P0550 is a power steering fault and can occur in a variety of vehicle models, but is most common in the following vehicles:

Ford: Focus, Mondeo, Fiesta, C-Max (2005-2015)
Opel: Astra, Corsa, Vectra, Zafira (2004-2014)
Volkswagen: Golf, Passat, Polo, Touran (2006-2016)
BMW: 3 Series, 5 Series, X3, X5 (2007-2017)
Mercedes-Benz: C-Class, E-Class, A-Class, B-Class (2008-2018)
Audi: A3, A4, A6, Q5 (2009-2019)
Peugeot: 307, 308, 407, 508 (2005-2015)
Citroën: C4, C5, Xsara Picasso, Berlingo (2004-2014)
Renault: Mégane, Laguna, Scénic, Clio (2006-2016)

If code P0550 occurs in your vehicle, you should first check the power steering fluid level and check the system for visible leaks. A professional diagnosis at a specialist workshop is recommended, as the power steering is a safety-relevant system. Do not ignore this error code, as a defective power steering system can lead to dangerous driving situations, especially at slow speeds and during parking maneuvers.

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