P055A - Power Steering Pressure Sensor Circuit Range/Performance Problem in Many Vehicles

Quick Answer

P055A means: P055A indicates a problem with the power steering pressure sensor circuit.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P055A? Immediate attention is recommended as it can affect steering control.

Common Questions

What does P055A mean and how does it affect my car?

The P055A code indicates a problem with your vehicle's power steering pressure sensor circuit. This sensor monitors the hydraulic pressure in the power steering system, allowing your car to adjust the steering assist. If this sensor fails, you may experience a stiff steering wheel, especially at low speeds, which can make driving more difficult and potentially unsafe over time.

What are the most common causes of P055A and how much does it cost to fix?

Common causes of the P055A code include a faulty power steering pressure sensor, wiring issues, or a failing power steering pump. Repair costs can range from $150 for a simple sensor replacement to $600 for pump replacement, depending on the specific issue and labor involved.

Can I drive my car with P055A or should I stop immediately?

While you can technically drive your car with the P055A code, it is not advisable. The code indicates potential steering issues that can compromise your control over the vehicle. It's best to have it diagnosed and repaired as soon as possible to ensure safe operation.

How can I diagnose P055A myself using GeekOBD APP?

To diagnose the P055A code with the GeekOBD APP, start by connecting the app to your vehicle's OBD-II port. Retrieve the DTCs and review any freeze frame data to understand the conditions under which the code was triggered. You can then check the power steering pressure sensor and associated wiring for any visible issues.

What vehicles are most commonly affected by P055A?

The P055A code is frequently reported in vehicles such as the 2015-2018 Honda Accord, 2014-2019 Chevrolet Silverado, and 2016-2020 Ford Fusion. Always check for any recalls or technical service bulletins that may apply to your specific vehicle.

How can I prevent P055A from happening again?

To prevent the P055A code from reoccurring, regular maintenance of your power steering system is essential. This includes checking fluid levels, inspecting for leaks, and ensuring that electrical connections are clean and secure. Additionally, replacing the power steering fluid as recommended by your vehicle's manufacturer can help prolong the life of the system.

What is P055A?

The P055A diagnostic trouble code indicates a performance issue with the power steering pressure sensor circuit. This sensor plays a critical role in monitoring the hydraulic pressure within the power steering system, providing essential data to the engine control unit (ECU) to optimize steering performance and efficiency. When the sensor malfunctions or fails to send accurate pressure readings, the ECU may not properly adjust the power steering assist, leading to steering difficulty and potential safety hazards. Commonly reported in vehicles such as the 2015-2018 Honda Accord, 2014-2019 Chevrolet Silverado, and 2016-2020 Ford Fusion, the P055A code usually triggers the check engine light and may come with symptoms like a stiff steering wheel and increased steering effort, especially at low speeds. Ignoring this code can lead to further damage in the steering system, resulting in costly repairs and compromised vehicle control. If your vehicle's dashboard displays this code, it's crucial to address it promptly to ensure safe and reliable handling of your vehicle.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P055A is present:

  • Check engine light stays on constantly, indicating the P055A code has been triggered.
  • Stiff steering wheel, making maneuverability difficult, especially during low-speed turns.
  • Increased steering effort required, resulting in driver fatigue over extended periods.
  • Unusual noises when turning the steering wheel, such as whining or groaning sounds.
  • Fluid leaks around the power steering pump, which can be visually observed under the vehicle.

Possible Causes

Most common causes of P055A (ordered by frequency):

  1. The most common cause is a faulty power steering pressure sensor, which occurs in about 60% of cases.
  2. Wiring issues or corrosion in the power steering system can lead to inaccurate sensor readings, making up about 20% of the cases.
  3. A failing power steering pump, which may not generate adequate pressure, accounts for about 10% of P055A occurrences. Regular maintenance can help prevent this.
  4. Less common but serious causes include a malfunctioning ECU that misinterprets sensor data, leading to improper steering assist.
  5. Rarely, issues with the vehicle's hydraulic system can cause pressure fluctuations, triggering the P055A code.

P055A Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replacing the faulty power steering pressure sensor to restore proper function.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing any damaged wiring or connectors that may be causing the issue.

  • Total: $100 - $250
  • Success rate: 80%
Power Steering Pump Replacement

Replacing the power steering pump if it is found to be failing.

  • Total: $300 - $600
  • Success rate: 75%
Money-Saving Tips for P055A
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P055A Diagnosis Process

Follow these systematic steps to accurately diagnose P055A. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the power steering pressure sensor and wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the power steering pressure sensor and wiring (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and ensure the steering system operates smoothly (15-20 minutes)

Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and ensure the steering system operates smoothly (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Power Steering Pressure Sensor Replacement on 2016 Ford Fusion

Vehicle: 2016 Ford Fusion, 45,000 miles

Problem: Customer reported a stiff steering wheel and illuminated check engine light.

Diagnosis: After scanning with the GeekOBD APP, the P055A code was confirmed. A visual inspection revealed corrosion in the wiring harness.

Solution: Replaced the power steering pressure sensor and repaired the damaged wiring.

Cost: $250 (sensor $150, labor $100)

Result: Steering returned to normal operation, and the check engine light was cleared successfully.

Case Study 2: Chevrolet Silverado Power Steering Issue

Vehicle: 2017 Chevrolet Silverado, 60,000 miles

Problem: Customer experienced increased steering effort and whining noise when turning.

Diagnosis: The GeekOBD scan revealed the P055A code. Further testing indicated a failing power steering pump.

Solution: Replaced the power steering pump and fluid.

Cost: $500 (pump $350, fluid $50, labor $100)

Result: The vehicle's steering was restored to normal, and no further issues were reported.

Diagnose P055A

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P055A
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes