P0557 - Brake Booster Pressure Sensor Sensor Low Input

The ECM detected a brake booster pressure sensor sensor low input fault.

Code Overview

The ECM detected a brake booster pressure sensor sensor low input fault.

Common Causes

• Failed pressure sensor
• Vacuum or hydraulic issue at the booster
• Damaged wiring or connector

Diagnostic Steps

1. Inspect the sensor connector and harness
2. Check booster vacuum or pressure supply
3. Compare sensor data to actual brake-assist behavior

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.