C0592Brake Booster Motor B Phase U-V-W Current High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0592 reports excessive current in the second motor or second winding system, B, of an electric brake booster. No manufacturer publishes it in this sense; the number appears only in GM's keyword list PIP5094 for 2014 and older vehicles, from an earlier numbering. Side B exists in redundant layouts such as the Hyundai Mobis dual-winding booster motor, where two power modules with six MOSFETs each drive one winding and the healthy module takes over the full current command once the other is diagnosed as failed. Overcurrent on such a stage is caught by MOSFET drain-source monitoring and shunt amplifiers, as offered by TI's DRV8343-Q1. GM's side A limits (above 20 A leakage, 38 A offset) show the order of magnitude. Expect assist on side A only or reduced.
- What you may notice
- Brake assist warning, possibly weaker or slower assist
- Brake or ABS warning lamp on
- Likely causes
- PossibleShorted or leaking transistor in power module B
- PossibleInsulation fault in winding system B
- RareMeasuring offset of the side B current sensing
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.