C058EBrake Booster Motor B Position Sensor Circuit Range/Performance
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- C058E concerns a second rotor angle channel of the electric booster motor whose readings are electrically valid but not believable. In GM's 2019 integrated brake control unit this is MPS2, a SENT sensor checked against the faster SPI sensor MPS1 of the same motor: a gap above 2° plus a 3° speed allowance, opposite directions or a changed rest offset for 100 ms set it, Type A with MIL. GM's PIT5638 series for the 2019 Silverado and Sierra 1500 covers cases where the cluster showed Service Brake Assist and the pedal turned hard; the fix was new BSCM calibration, and the ECM adds P25A2. Stellantis names C058E for the eBooster of the 2022–25 Wagoneer and Grand Wagoneer; if it returns after the revised test, BSCM and booster are replaced as a pair.
- What you may notice
- Service Brake Assist message in the instrument cluster
- Hard brake pedal needing more effort, longer stopping distance
- Check engine lamp via the brake module request (P25A2)
- Likely causes
- LikelyBrake control module calibration causing false correlation faults (GM PIT5638)
- PossibleSecond rotor position sensor in the booster drifting or failing
- PossibleFault inside the brake control module or eBooster unit (replaced together)
- RarePoor contact in the booster sensor connector
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.