Faulty brake booster motor position sensor; Damaged or corroded wiring harness connector at the sensor; Open or high-resistance ground circuit for the sensor; Short to voltage on the sensor signal circuit; Failed brake booster motor assembly (internal sensor fault); Water intrusion or contamination in the connector or sensor housing

DTC codes / C05xx · Brakes, steering and suspension / C058D

C058DBrake Booster Motor B Position Sensor Circuit High

Q: What does code C058D mean?

Brake Booster Motor B Position Sensor Circuit High. The C058D code indicates that the brake booster motor's position sensor circuit is reporting a voltage higher than the manufacturer's expected range. The computer has detected an abnormally high signal on the sensor's return circuit, which may be caused by a short to voltage, an open ground, or a faulty sensor.

The C058D code indicates that the brake booster motor's position sensor circuit is reporting a voltage higher than the manufacturer's expected range. The computer has detected an abnormally high signal on the sensor's return circuit, which may be caused by a short to voltage, an open ground, or a faulty sensor.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

Illumination of the brake system warning light or stability control warning light
Often no symptoms besides the warning light, with normal brake pedal feel and performance
Reduced or disabled brake assist, requiring increased pedal effort during hard braking
A stored code in the anti-lock brake system (ABS) module or body control module (BCM)
Intermittent warning light activation, especially in wet or humid conditions

Common causes, most likely first

Faulty brake booster motor position sensor
Damaged or corroded wiring harness connector at the sensor
Open or high-resistance ground circuit for the sensor
Short to voltage on the sensor signal circuit
Failed brake booster motor assembly (internal sensor fault)
Water intrusion or contamination in the connector or sensor housing

How to diagnose and fix it

Use a scan tool to retrieve all codes and freeze-frame data, then clear the code and test-drive to see if it returns
Visually inspect the sensor connector and wiring for corrosion, damage, or loose pins
Measure reference voltage and ground at the sensor connector with a digital multimeter (DMM) and compare to manufacturer specifications
Back-probe the sensor signal wire and check for a short to voltage with the ignition on
Perform a resistance test on the sensor itself and compare to the specified range
If wiring and sensor test good, check the brake booster motor assembly for internal faults or replace the sensor
After repair, clear codes and verify the sensor reads within normal range during a road test

Don't overlook the ground circuit

A high sensor signal is often caused by a bad ground rather than a failed sensor, so always check ground integrity before replacing parts.
The brake booster motor position sensor is sometimes integrated into the booster assembly, making replacement more involved than a simple sensor swap.
Intermittent high signals can be caused by water intrusion into the connector, especially on vehicles that see frequent wet or muddy conditions.
This code can set alongside other brake system codes, so diagnose the root cause rather than chasing each code individually.
A weak battery or charging system issue can cause erratic sensor readings and set this code, so verify battery health first.

Can I keep driving with C058D?

You can generally continue driving if the brake pedal feels normal, but avoid hard braking or emergency stops until the fault is repaired, as brake assist may be reduced or disabled.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.