C0580Brake Booster Motor A Phase U-V-W Circuit Low
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- C0580 flags a phase of booster motor A that is pulled too low, or a driver stage that cannot lift it properly. GM's 2016 and 2019 hybrid tables use it when the gate-drive supply of the bridge driver falls too far below the motor supply (7 V limit, 5 ms). In the 2019 IBC unit it covers a phase that does not drop under 0.99 V while its lower transistor conducts, a phase already near 0 V before the bridge is enabled, and an undercharged bootstrap capacitor – all Type A with MIL. Automotive gate drivers such as TI's DRV8305-Q1 report this charge-pump undervoltage themselves. Note the older meaning: on the 2011 Saab 9-5 and related GM cars, C0580 was the right front damper actuator of the adaptive suspension. In the booster meaning the module normally switches assist off.
- What you may notice
- Electric brake assist off, pedal feels hard
- Brake and stability warning lamps, on GM also the check engine lamp
- Fault may appear right after switching the ignition on
- Likely causes
- LikelyGate-driver or charge-pump supply in the brake module too low (internal defect or weak supply)
- PossiblePhase lead of motor A chafed through and shorted to ground
- PossibleLower bridge transistor shorted or permanently driven
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €2,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.