C0598Brake System Control Module B Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0598 is the same summary check for a second brake control module, B. Such a module is found where braking is split between two units: Bosch gives its integrated power brake a separate backup unit for automated driving, so the vehicle still stops if the main unit fails. A BWI patent describes such a backup unit with its own control unit, motor and pumps for the front axle, linked to the main unit over a private CAN line and taking over pedal boost in the fallback mode. C0598 reports that unit B fails its internal checks. No manufacturer documents C0598 publicly; Toyota's use of C0597 for control module A shows the lettering. Redundancy or assist is reduced while it is stored.
- What you may notice
- Brake system warning message
- Driver assistance or automated driving functions unavailable
- Reduced brake assist if the module handles boosting
- Likely causes
- PossibleSoftware or calibration fault in brake module B
- PossiblePower supply or ground problem of module B
- PossibleInternal hardware fault of module B
- RareFault on the link between the two brake modules
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.