UAE
AU
C058200

DTC C058200 indicates the supply voltage to the brake booster motor inside the IPB (Intelligent Integrated Braking System / One-box electro-hydraulic brake-by-wire system) falls outside the normal operating threshold set by the ECU (typically 9-16V DC) — Atto 3

Braking System

DTC C058200 indicates the supply voltage to the brake booster motor inside the IPB (Intelligent Integrated Braking System / One-box electro-hydraulic brake-by-wire system) falls outside the normal operating threshold set by the ECU (typically 9-16V DC).

This brushless DC motor drives the brake master cylinder to generate hydraulic brake assist.

A generator regulator fault, a power supply circuit short, or reversed polarity during jump-starting can cause high voltage (>16V).

A discharged battery, excessive wiring voltage drop, poor ground connection, or internal module DC-DC power supply chip failure can cause low voltage (<9V).

This fault triggers the IPB degraded mode, reducing or completely disabling the brake assist function (hard brake pedal).

The fault may also inhibit ABS/ESC/EBD functions.

In severe cases, the system illuminates the red brake warning lamp, compromising driving safety.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Burnt fuse holder on Song PLUS DM-i causing voltage drop

✓
Vehicle presented with intermittent ABS/ESC warning lights and stiff brake pedal while driving. DTCs C058200 (current) and U012187 (history) read. IPB supply voltage measured 8.2 V during fault reproduction; battery voltage remained normal. Front compartment fuse box inspection revealed the IPB 30A fuse (F2/03) holder burnt and pins loose, increasing contact resistance under high current. Replaced the fuse box holder and fuse, polished the IPB connector pins, and retightened the ground cable. Fault resolved.
BYD DTC AI Analysis

Qin PLUS DM-i: Sudden voltage drop during cold start

✓
Owner reported dashboard warnings during cold starts in northern winter. DTCs C058200 and C003F00 (brake booster motor fault) stored. Measurements checked normal at ambient temperature, but during a -15°C cold start, battery voltage dropped instantly to 9.5V. The IPB internal power supply chip failed to maintain stable output due to poor low-temperature characteristics. Replaced the IPB electro-hydraulic module assembly and recommended the owner install an AGM battery with better low-temperature performance. The fault has not reoccurred.
BYD DTC AI Analysis

Aftermarket dashcam causing power interference on Dolphin

✓
The owner fitted a dashcam themselves, splicing into the IPB fuse for constant power, causing intermittent C058200 faults while driving. Inspection found the modified wiring had damaged insulation and shorted to the body, creating voltage fluctuations in the IPB supply. Factory wiring was restored, with a separate feed run from the battery positive via the fuse box, returning the IPB system to normal. Do not tap into brake system fuses for modifications.
BYD DTC AI Analysis

Han EV IPB internal MOSFET failure

✓
While driving, the red brake system warning light suddenly illuminated and the pedal went hard with almost no boost. Scanned DTC C058200 (voltage too high, freeze frame showed 16.8V). Checked alternator and battery voltage – normal. Measured power input at the IPB connector – normal, but the module internally detected an abnormal motor supply. Disassembled the IPB and found the internal motor drive MOSFET had shorted, causing the detection circuit to report voltage out of range. Replaced the IPB assembly and recalibrated. Issue resolved.
BYD DTC AI Analysis

Tang DM-p poor ground connection causing intermittent fault

✓
ABS warning light came on intermittently when driving on rough roads. Read DTC C058200 (low voltage). Found the G101 ground point bolt in the left front engine bay loose and oxidized. The IPB draws high current (20A peak); poor grounding caused circuit voltage drop, and the module detected voltage below threshold. Cleaned the ground point, tightened the bolt to specified torque (10N·m), and applied conductive paste. Fault resolved.
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For the BYD Song MAX (2017–2019), DTC B1108 indicates a short circuit in the PM2.5 air quality detection module (dust sensor) or its wiring harness. The sensor uses laser scattering to detect in-cabin and outside PM2.5 concentrations and transmits data to the HVAC ECU via the LIN bus or an analog signal. Short circuit conditions include: 1) Sensor power supply wire (+5V/+12V) shorted to ground 2) Signal wire shorted to power or ground 3) Short circuit in the sensor's internal photoelectric detection circuit This fault prevents the automatic climate control from switching between fresh air and recirculation based on air quality. The system enters fail-safe mode (typically forced recirculation). Severe short-circuit current can destroy the HVAC ECU sampling circuit. The system classifies this as a Level 3 severe fault and restricts vehicle operation to prevent electrical fires or controller damage. For other BYD models (such as the Qin EV, E5, and Song DM), B1108 indicates a driver-side sunload sensor fault, reflecting differences in DTC definitions across models.B110811This DTC indicates a short circuit in the air conditioning system PM2.5 air quality sensor (rapid detector). Specifically, abnormal continuity exists between the sensor power supply circuit or signal output circuit and body ground or battery positive. This causes the control module (ACU/air conditioning controller) to detect abnormal current or a voltage signal outside the valid range (typically 0V or supply voltage). The PM2.5 sensor monitors internal and external particulate concentrations, providing the data the automatic air conditioning system uses to switch between fresh air and recirculation modes. A short circuit disables the air quality monitoring function. This fault may force the air conditioning system into recirculation protection mode and trigger related thermal management system faults, as the air conditioning system acts as a key actuator in vehicle thermal management. In severe cases, the short circuit current can damage the internal sampling circuit of the air conditioning controller or overheat the wiring harness.
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.