C05D4
Brake Master Cylinder Piston Position Sensor Calibration Not Learned
C05D4 is an OBD-II diagnostic trouble code meaning: Brake Master Cylinder Piston Position Sensor Calibration Not Learned. Common causes: piston position sensor malfunction, problems with the master cylinder. Estimated repair cost: $56–167.
Symptoms
- ABS or ESP indicator is on
- Reduced braking performance
- Unusual behavior of the brake pedal (too soft/hard)
Causes
- Piston position sensor malfunction
- Problems with the master cylinder
- Sensor is dirty or damaged
- Low brake fluid level
- Air in the brake system
- Problems with wiring or connectors
How to Fix
- Check the brake fluid level
- Diagnose the piston position sensor with a scanner
- Check the integrity of the wiring and connectors
- If necessary, replace the sensor or master cylinder
- Bleed the brake system
- Calibrate the sensor using diagnostic equipment
Related codes
Error C05D4 by Vehicle Brand
FAQ
What does the C05D4 code mean?
C05D4 is an OBD-II diagnostic trouble code that indicates: Brake Master Cylinder Piston Position Sensor Calibration Not Learned
What causes a C05D4 error code?
The most common causes of C05D4 include: Piston position sensor malfunction; Problems with the master cylinder; Sensor is dirty or damaged; Low brake fluid level.
How do I fix a C05D4 diagnostic trouble code?
To fix C05D4: Check the brake fluid level. Diagnose the piston position sensor with a scanner. Check the integrity of the wiring and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C05D4?
Limited driving only, diagnose soon
How much does it cost to fix C05D4?
The estimated repair cost for C05D4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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