C0586Brake Booster Motor B Phase U-V-W Circuit Range/Performance
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0586 is set when the B drive stage of the booster motor is electrically connected but behaves implausibly: phase currents that do not match the command, a transistor pair conducting at once, or a bridge driver that fails its start-up self-test. Nobody publishes limits for side B. GM's tests for motor A under C0582 – more than 150 A in a cross-switching test, an idle phase not at 1.65 V – show what such a check looks like. TI's DRV3245Q-Q1, designed for electric brake and brake assist, adds shoot-through prevention and gate-source monitoring for the same purpose. In a dual-winding motor like the Hyundai Mobis one, diagnostics classify each power module as healthy or failed; the failed one is switched off, so the driver may notice a weaker or slower pedal response.
- What you may notice
- Brake warning or service message
- Pedal response weaker or slower than usual
- Likely causes
- PossibleBridge driver of channel B failing its self-test
- PossibleCurrent measurement of channel B drifting, currents no longer match the command
- RareControl unit software issue, resolved by update where available
- 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.