Code
C0599
Generic
C — Chassis
Brake Booster Control Module Missing Calibration
AI status
Completed
Completed
100%
Causes
- Module replaced and not programmed/calibrated
- Loss of module memory due to battery disconnect or voltage spike
- Corrupted or incomplete software update/reflash
- Failed or interrupted calibration/relearn procedure
- Internal module EEPROM/memory fault
- Communication errors preventing calibration data write (CAN/LIN problems)
Symptoms
- Brake ABS/BAS warning lamp illuminated
- Traction/stability warning lights may also be on
- Altered or inconsistent brake pedal feel or boost assist unavailable
- Possible reduced brake assist or message on dash (e.g., service brake)
- Vehicle may enter reduced-performance mode for braking systems
- Stored communication or calibration-related codes in other modules
What to check
- Read DTCs and freeze frame with OEM-level scan tool; note related U/C codes
- Check vehicle service history for recent module replacement, battery disconnect, or software updates
- Inspect module connector for corrosion, bent pins, or water intrusion
- Verify battery state-of-charge and charging system voltage (11–14.5 V during procedures)
- Attempt communication with the brake booster control module using manufacturer diagnostic tool
- Verify correct module part number and software/calibration version for the vehicle
Signal parameters
- Module supply voltage during diagnostics: 11–14.5 V (nominal 12 V system)
- Module ground continuity: near 0 ohms to chassis ground
- CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential nominal ~0 V idle); active frames show expected differential voltage
- Diagnostic communication: ISO-TP/UDS or manufacturer protocol responding to read ID and security requests
- Module current draw: no abnormal high current at key-off (consult OEM spec)
Diagnostic algorithm
- Connect OEM-level scan tool and record all codes and freeze-frame data from brake booster module and other modules.
- Confirm vehicle history: was the booster module replaced, updated, or battery disconnected recently?
- Verify battery voltage and charging system. Recharge or stabilize battery to recommended level before programming.
- Visually inspect connectors and harness to the brake booster module; repair any damaged wiring or poor grounds.
- Confirm communication: use scan tool to read module IDs, software and calibration versions. Note if module is unprogrammed or shows 'no calibration'.
- Attempt to perform calibration/programming using the manufacturer's reflash/tool procedure. Follow security access and required prerequisites (battery saver, network wake-up, tool firmware).
- If programming fails, check CAN network: verify termination resistors, measure CAN_H/CAN_L, and resolve any other module communication faults (U-codes) first.
- If programming still fails or module reports internal memory faults, replace module with correct part and perform programming/calibration per OEM procedure.
- After successful programming/calibration, clear codes, perform any required relearn procedures (brake bleed, pedal sensor relearn, ABS/ESP relearns), and road-test to confirm normal operation.
- If issue persists, escalate to manufacturer technical support—capture tool logs and error messages for analysis.
Likely causes
- Module recently replaced or serviced and not programmed
- Incomplete or interrupted reflash/update by scan tool
- Battery drain or jump start that cleared learned data before reprogramming
- Diagnostic tool incompatibility or wrong calibration file used
- CAN bus communication fault preventing calibration write
Fault status
Status
Brake Booster Control Module missing calibration data — module requires programming/calibration.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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