C058D code meaning
Brake Booster Motor B Position Sensor Circuit High
What C058D means
C058D is set when a signal of motor B's position sensor exceeds its upper limit, for example because a sensor line touches supply voltage or the sensor ground has opened. No manufacturer documents C058D publicly; the range/performance case of the same sensor is C058E, which Stellantis lists for the Jeep Wagoneer eBooster. A short to battery in a resolver path pushes the evaluated signal to its ceiling, as Hitachi's patent explains. Bosch's booster patent outlines what a controller can still do when rotor position feedback is lost: drive the motor open-loop with capped speed and limited speed changes. Depending on the design, the module therefore continues with motor A, runs a degraded mode or switches assist off entirely.
C058D 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 C058D
- Brake system warning and message
- Assist weaker or switched off depending on design
Common causes of C058D
- Most likelySignal line of sensor B shorted to supply or battery voltage
- PossibleOpen ground of sensor B lifting the signal
- Less likelyInternal fault of sensor B in 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 C058D means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8D | The exact fault in that area. |
What to do next
- Note C058D 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 C058D
What does C058D mean?
C058D means "Brake Booster Motor B Position Sensor Circuit High". C058D is set when a signal of motor B's position sensor exceeds its upper limit, for example because a sensor line touches supply voltage or the sensor ground has opened. It is a generic code, so it means the same on every make.
Is it safe to drive with C058D?
Drive gently and only to a workshop. With C058D the car can go into limp mode (reduced power) to protect itself.
Will C058D fail an emissions test?
C058D 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 C058D to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will C058D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.