Power Steering Pressure Sensor Circuit Malfunction
The P0550 code indicates a malfunction in the power steering pressure (PSP) sensor circuit. The PSP sensor monitors hydraulic pressure in the power steering system and sends a voltage signal to the PCM. When the signal is out of range or missing, the PCM sets this code. Common causes include a faulty PSP sensor, wiring issues, or low power steering fluid.
01. Most Common Causes
- Faulty power steering pressure sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Low or contaminated power steering fluid
- Failed power steering pump
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard steering or increased steering effort
- Erratic power steering assist
- Whining noise from power steering pump
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect power steering fluid level and condition; top off or replace if necessary.
Step 3: Visually check the PSP sensor wiring and connector for damage, corrosion, or loose connections.
Step 4: Test the PSP sensor signal voltage with a multimeter; compare to manufacturer specs.
Step 5: If sensor and wiring are OK, test the power steering pump pressure to rule out mechanical failure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with P0550 as it can lead to loss of power steering assist, making steering difficult and unsafe, especially at low speeds.
How much does it cost to fix?▼
The cost to fix P0550 typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or pump replacement is needed.