Code result
C05D4
Brake Master Cylinder Piston Position Sensor Calibration Not Learned
Moderate severity
What it means
Master cylinder piston position sensor calibration not learned.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Calibration not performed
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose C05D4 freeNo credit card required