Chassis, generic

C0599 Brake Booster Control Module Missing Calibration

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Booster or its control module replaced without running the setup/calibration routine
Software update or programming of the booster module aborted or incomplete
Internal memory fault in the booster control module losing stored data

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake booster module

Related codes

C0560C05AEC05D4C058EC0597

References: bosch-mobility.com, patents.google.com, gsi.ext.gm.com, fordservicecontent.com.