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C0599 — Brake Booster Control Module Missing Calibration

Generic OBD-II · all makesChassis

The Brake Booster Control Module is missing the necessary calibration data required for operation. This typically occurs when the module cannot access its internal software parameters, often following a component replacement or a system power failure.

Symptoms

What causes it — most likely first

1. Unprogrammed Module

A replacement brake booster control module was installed but the required calibration/programming was not performed.

2. Software Corruption

An interrupted software update or a system glitch caused the calibration data to be erased or corrupted.

3. Battery Voltage Drop

Severe battery drain or a voltage spike during jump-starting caused the module to lose stored calibration memory.

4. Internal Module Failure

The internal non-volatile memory of the brake booster control module has failed.

5. Communication Fault

Intermittent wiring issues prevent the module from receiving calibration data from the vehicle's network.

6. PCM/ECM Fault

The main engine control module is unable to communicate or transmit the necessary configuration data.

How it's diagnosed

  1. Perform a full system scan to check for accompanying communication codes (U-codes).
  2. Verify battery health and ensure the system voltage is within the manufacturer's specified range.
  3. Review vehicle service history for recent brake module or electronic control unit replacements.
  4. Attempt to perform a calibration or 'learning' procedure using a compatible diagnostic tool.
  5. Inspect the wiring harness and connectors leading to the brake booster control module for corrosion or damage.
  6. Flash the latest software version to the module to restore missing parameters.

Code facts & related codes

SystemChassis
StandardizationSAE generic — identical on every make

Frequently asked

Is it safe to drive with this code?

If the brake pedal feels harder than normal, it is unsafe as stopping distances are increased. The vehicle should be inspected immediately.

Do I need to replace the PCM to fix this?

No. This code almost always indicates a software or calibration issue within the booster module itself; replacing the PCM is rarely the correct solution.

Will clearing the code with a scanner fix the problem?

No. Clearing the code removes the notification, but it does not restore the missing calibration data required for the system to function.