C058BBrake Booster Motor B Position Sensor Circuit/Open
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C058B reports an open circuit at the position sensor of booster motor B. Such a second sensor exists where the booster has a second motor or winding system with its own commutation, or where the rotor angle is measured twice for safety. Stellantis shows that the eBooster of the Jeep Wagoneer has a motor B position channel, since its parts bulletin names C058E (range/performance) for it; C058B itself is not published by any maker. Kollmorgen's early patent on redundant windings gives every winding set its own group of Hall sensors, so losing one group only affects that set. An open line is detected as in Hitachi's resolver circuit: the bias signal no longer arrives and the input floats to its pull-up level. The module then drops channel B and runs on A or with reduced assist.
- What you may notice
- Brake system warning with service message
- Possibly reduced assist or limited assistance functions
- Likely causes
- LikelyBroken signal or supply wire of position sensor B
- PossibleLoose or corroded contact in the sensor B connector
- RareFailed sensor element B inside the booster
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.