C0599Brake Booster Control Module Missing Calibration
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0599 means the control unit of an electric brake booster finds no valid calibration data. Stand-alone electromechanical boosters such as Bosch's iBooster carry their own controller, which converts the reading of a built-in differential travel sensor into motor commands; how the pedal feels is set by software parameters. A Bosch patent describes keeping the characteristic between booster travel and driver input in exactly this unit. If that data set or its learned values are absent, typically after a booster or module swap or an aborted flash, the code is stored. No maker documents C0599 publicly. As a yardstick, GM's check for a pressure sensor calibration (C0560) only reads the stored end-of-line status 500 ms after wake-up. Expect weak or missing assist and a hard pedal until the setup routine has run.
- What you may notice
- Brake warning or service brake assist message in the cluster
- Hard brake pedal with reduced power assist
- Driver assistance functions using the booster (e.g. emergency braking) unavailable
- Likely causes
- LikelyBooster or its control module replaced without running the setup/calibration routine
- PossibleSoftware update or programming of the booster module aborted or incomplete
- RareInternal memory fault in the booster control module losing stored data
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.