C058B code meaning
Brake Booster Motor B Position Sensor Circuit/Open
What C058B means
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.
C058B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C058B
- Brake system warning with service message
- Possibly reduced assist or limited assistance functions
Common causes of C058B
- Most likelyBroken signal or supply wire of position sensor B
- PossibleLoose or corroded contact in the sensor B connector
- Less likelyFailed sensor element B inside the booster
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Booster motor b pos sensorSensor wiring
What each part of C058B means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8B | The exact fault in that area. |
What to do next
- Note C058B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C058B
What does C058B mean?
C058B means "Brake Booster Motor B Position Sensor Circuit/Open". C058B reports an open circuit at the position sensor of booster motor B. It is a generic code, so it means the same on every make.
Is it safe to drive with C058B?
Drive gently and only to a workshop. With C058B the car can go into limp mode (reduced power) to protect itself.
Will C058B fail an emissions test?
C058B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C058B to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C058B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.