C0583Brake Booster Motor B Phase U-V-W Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0583 refers to the second motor or second winding system, B, of an electric brake booster and reports an interrupted phase path there. Not every booster has a B side: GM's public tables diagnose motor A only, and no manufacturer documents C0583 in this meaning. GM's keyword list for 2014 and older vehicles (PIP5094) contains C0583 from an earlier numbering. A B channel makes sense in redundant layouts such as the dual-winding gear motor in a Hyundai Mobis patent, where two power modules each feed one three-phase winding and either one can carry the full current. An open B phase is found the same way as on side A, for example using the driver chip's open-load check. The module drops the faulty channel; depending on design, assist continues on A or is reduced.
- What you may notice
- Brake warning lamp with a service message
- Weaker or slower brake assist if only side A remains
- Likely causes
- PossibleOpen winding or internal phase connection of motor/winding system B
- PossiblePower module B with a transistor that no longer conducts
- PossibleLoose or corroded phase contact on the B side
- Repair
- Hard · Usually a job for a workshop.Typical cost: €200 – €2,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.