C059BBrake Pressure Sensor B Missing Calibration
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The brake module cannot confirm that pressure sensor B has been calibrated and that its sensitivity is right. GM uses C059B in the brake controller of its 2016 and 2019 hybrid tables for the rear-left wheel pressure sensor: during a test pulse the sensor response must stay between 90 % and 110 %, checked only after at least one completed offset learn, with low master cylinder pressure and no ABS, traction or stability intervention. Type A, MIL after one trip; to confirm a fix, drive above about 6 mph for a minute without braking. In those same tables the rear-left sensor's circuit faults use C0575–C0578. A Bosch patent likewise treats a failed test pulse as a sensitivity fault with ABS and ESC lamps on. Ford checks sensor data by checksum and ID, but only for sensor A (C0560).
- What you may notice
- ABS and stability control warning lamps on, MIL possible
- Regenerative braking blending or ESC functions restricted
- Likely causes
- LikelyCalibration or offset learn not completed after module or hydraulic unit replacement
- PossiblePressure sensor responding outside the allowed test-pulse window
- RareBrake control module storing or evaluating calibration data incorrectly
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.