P05FF

Symptoms

• ABS or ESP light is on
• Check Engine Light Is On
• Possible disabling of ABS and ESP
• Unstable Brake Assist (BA) operation
• Brake warning

Causes

• Brake pressure sensor malfunction
• Faulty or misaligned brake pedal position sensor
• Brake fluid leak (pressure leak)
• Air in the brake system
• Master cylinder malfunction

How to Fix

1. Read codes, check for associated ABS/ESP codes
2. Visually inspect the brake system for fluid leaks
3. Check the brake fluid level in the reservoir
4. Read the parameters of both sensors by the scanner in real time when you press the pedal
5. Check pedal position sensor calibration
6. Replace the faulty sensor after confirming the fault

Related codes

Error P05FF by Vehicle Brand