C05C1Brake Pedal Position Sensor B Not Learned
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Set when the second, redundant channel B of the brake pedal position sensor lacks a stored zero point. Many electric and hybrid brake pedals read travel twice so that one channel can cross-check the other; Bosch builds such pedal travel sensors with a magnetic field sensor and two redundant outputs. Without a learned rest value for B, that cross-check is lost even when channel A is fine. No manufacturer publishes C05C1. GM handles the comparable fault as C0277-4B and simply recalibrates, and Hitachi only accepts a new zero if the complete learn run finished without pedal input. After fitting a new pedal sensor or control unit, run the learn with the pedal fully released. C05C0 is the twin for channel A, C061A the offset-limit fault.
- What you may notice
- Brake warning lamp or service message
- Reduced redundancy, some assist or regeneration functions disabled
- Likely causes
- LikelyChannel B not learned after a repair or software update
- PossibleLearn conditions not met (pedal pressed, vehicle rolling)
- PossibleChannel B of the pedal sensor faulty or out of tolerance
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.