P0556 - Understanding DTC P0556: Power Steering Pressure Sensor Range/Performance Problem in Common Vehicles

Quick Answer

P0556 means: DTC P0556 refers to a power steering pressure sensor range or performance problem.

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

Can I drive with P0556? It's advisable to address this issue as soon as possible to avoid steering difficulties.

Common Questions

What does P0556 mean and how does it affect my car?

DTC P0556 indicates a problem with your power steering pressure sensor. This can lead to difficulties in steering, especially at lower speeds, which can compromise your safety on the road. Long-term, ignoring this code may lead to further complications and expensive repairs.

What are the most common causes of P0556 and how much does it cost to fix?

The most common causes of P0556 include a faulty power steering pressure sensor, damaged wiring, and low fluid levels. Fixing these issues typically costs between $150 and $300, depending on the specific repair needed.

Can I drive my car with P0556 or should I stop immediately?

While you can technically drive with a P0556 code, it's not advisable. Heavy steering can make maneuvering difficult and may pose a safety risk. It's best to address the issue promptly to avoid worsening the problem.

How can I diagnose P0556 myself using GeekOBD APP?

To diagnose P0556 with the GeekOBD APP, connect the app to your vehicle's OBD2 port, retrieve the trouble codes, and check the freeze frame data for context. This will help you understand when the issue occurs and any other related codes.

What vehicles are most commonly affected by P0556?

Common vehicles affected by P0556 include the 2013-2017 Ford Fusion, 2014-2018 Chevrolet Malibu, and various models from Honda, Nissan, and Toyota. Make sure to check for any recalls or service bulletins related to power steering issues.

How can I prevent P0556 from happening again?

Regularly check your power steering fluid levels and inspect the power steering system for leaks or wear. Routine maintenance can help prevent sensor issues and ensure the longevity of your steering system.

What is P0556?

DTC P0556 indicates a problem with the power steering pressure sensor, which is a critical component in vehicles that utilize power steering systems. This code typically signifies that the sensor is experiencing a range or performance issue, meaning it may be providing inaccurate readings to the engine control module (ECM). When the ECM receives faulty data, it can lead to improper power steering assistance, affecting the ease with which you can steer your vehicle. This trouble code is commonly seen in models like the 2013-2017 Ford Fusion and the 2014-2018 Chevrolet Malibu. If you ignore this code, you may notice that your steering feels heavier than usual, particularly at low speeds, posing a safety risk. Additionally, continued driving with this code may lead to further damage in the power steering system, potentially resulting in costly repairs. Addressing the P0556 code promptly can help ensure your vehicle maintains optimal steering performance and safety.

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

Symptoms

Common symptoms when P0556 is present:

  • The check engine light illuminates, often remaining on until the issue is resolved, signaling potential power steering issues.
  • Drivers may experience heavy steering, especially at low speeds, making it challenging to maneuver the vehicle.
  • Fuel economy may decrease significantly, with reports of drops between 10-15% as the vehicle compensates for the faulty sensor.
  • Unusual noises from the power steering pump, such as whining or groaning, can indicate problems with the steering system.
  • In some cases, the power steering may intermittently fail, leading to sudden changes in steering effort.

Possible Causes

Most common causes of P0556 (ordered by frequency):

  1. The most common cause of P0556 is a faulty power steering pressure sensor, which can occur in about 70% of cases. This sensor may fail due to wear or internal malfunction, leading to erroneous readings.
  2. Another common cause is damaged wiring or connectors related to the power steering system. This can prevent the sensor from transmitting accurate data to the ECM, leading to the code appearing.
  3. A third cause could be low power steering fluid levels. Regularly checking your fluid can help prevent this issue, as low levels can affect pressure readings.
  4. Less commonly, a defective power steering pump can trigger this code, especially if the pump is struggling to maintain adequate pressure.
  5. A rare but possible cause is a faulty ECM, which may misinterpret the sensor data, leading to the P0556 code.

P0556 Repair Costs

Cost Breakdown by Repair Type

Power Steering Pressure Sensor Replacement

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

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors related to the power steering system.

  • Total: $100 - $250
  • Success rate: 75%
Money-Saving Tips for P0556
  • 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 P0556 Diagnosis Process

Follow these systematic steps to accurately diagnose P0556. 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 around the power steering sensor (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the power steering sensor (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 to test the power steering pressure sensor and inspect the wiring harness for continuity (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the power steering pressure sensor and inspect the wiring harness for continuity (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 of the power steering system after repairs and clear codes with GeekOBD (10-15 minutes)

Step 4: System function test - Verify proper operation of the power steering system after repairs and clear codes with GeekOBD (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 the vehicle under various conditions to confirm that steering feels normal and that the warning light does not return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that steering feels normal and that the warning light does not return (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 in a 2015 Ford Fusion

Vehicle: 2015 Ford Fusion, 85,000 miles

Problem: Customer reported heavy steering and illuminated check engine light.

Diagnosis: After scanning the vehicle, P0556 was found. Visual inspection revealed a faulty power steering pressure sensor.

Solution: Replaced the power steering pressure sensor and performed a system function test.

Cost: $220 (parts $120, labor $100)

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

Case Study 2: Wiring Repair on a 2016 Chevrolet Malibu

Vehicle: 2016 Chevrolet Malibu, 60,000 miles

Problem: Customer noticed intermittent steering assist and P0556 code.

Diagnosis: Diagnostic testing revealed damaged wiring connecting the power steering sensor.

Solution: Repaired the wiring harness and tested the power steering system.

Cost: $180 (parts $20, labor $160)

Result: Steering assist was restored, and the check engine light remained off.

Diagnose P0556

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0556
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes