C058ABrake Booster Motor A Position Sensor Circuit Range/Performance
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- C058A covers a position signal of booster motor A that is electrically valid but not believable. GM uses it widely: its 2016 and 2019 hybrid tables flag a rotor angle changing faster than 73° per ms, the 2019 IBC unit an invalid Hall pattern (all three high or all low) and a frozen signal, the XT4 module a vector length outside 0.6889–1.2996, and the 2023/2025 tables angle jumps beyond 711.2 rad/s – each Type A with MIL. NXP likewise treats Hall patterns 000 and 111 as an interface fault. GM's PIC6614 lists C058A for the Cadillac Lyriq with a brake assist failure message; Stellantis names it alongside C0582 for the Jeep Wagoneer and asks for BSCM and eBooster to be replaced together.
- What you may notice
- Brake assist failure message, abnormal pedal feel
- Check engine and brake warning lamps (GM)
- Fault may be hard to read out with a normal scan tool
- Likely causes
- LikelyPosition sensor delivering implausible angles (Hall element or sine/cosine sensor degraded)
- PossibleIntermittent contact or interference on the sensor lines causing angle jumps
- PossibleBooster unit internal fault or position data no longer matching the stored calibration
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.