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C002192

This fault code indicates the IPB (Integrated Power Brake) system detects pressure inside the brake booster chamber below the normal operating threshold — Atto 3

Braking System

This fault code indicates the IPB (Integrated Power Brake) system detects pressure inside the brake booster chamber below the normal operating threshold.

In models such as the Song PLUS DM-i, the IPB system generates brake assist pressure via an electric vacuum pump or direct motor drive and continuously monitors this pressure using a pressure sensor.

The system triggers DTC C002192 when it detects assist pressure remaining below the target value (typically below -0.6bar or the set threshold range) for longer than the specified time (e.g., 500ms) and rules out sensor signal interference.

This fault causes a hard brake pedal and increased braking distance.

The system restricts the regenerative braking function and illuminates the ABS/ESC warning light.

Extreme conditions may trigger Limp Home mode, severely compromising driving safety.

4
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Song PLUS DM-i: Worn vacuum pump carbon brushes cause intermittent DTCs

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Vehicle: 2021 Song PLUS DM-i, 82,000 km. Symptoms: ABS warning light intermittently illuminates during cold starts (DTC C002192), clears after warm-up; brake pedal gradually stiffens. Diagnosis: Live data revealed the vacuum pump running continuously but only reaching -0.45 bar, below threshold. Disassembly revealed motor brushes worn to their limit (<5 mm) and a burnt commutator. Solution: Replaced the electric vacuum pump assembly (with control module) and performed IPB system calibration. Fault resolved. Service tip: DM-i vacuum pumps operate more frequently than conventional fuel vehicles; inspect the pump every 60,000 km.
BYD DTC AI Analysis

IPB module pressure sensor drift false alarm

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Vehicle: 2021 Song PLUS DM-i, 35,000 km. Issue: Brake system warning light illuminates intermittently while driving; DTC C002192 stored, but brake pedal feels normal without hardening. Diagnosis: Scan tool showed booster pressure at -0.05 bar (near atmospheric), contradicting actual brake feel. Checked vacuum lines—no leaks. Vacuum pump works normally. Found signal drift in the IPB internal pressure sensor. Fix: Replaced the IPB integrated electro-hydraulic brake module assembly (new module requires VIN matching). Performed brake line bleeding and sensor zero-point learning after replacement. Fault eliminated.
BYD DTC AI Analysis

Stuck vacuum line check valve causing pressure leak

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Vehicle: 2021 Song PLUS DM-i, 48,000 km. Symptoms: DTC C002192 sets after extended downhill driving or frequent braking, clears after restart. Diagnosis: Static pressure hold test showed vacuum dropping from -0.8 bar to -0.4 bar within 30 seconds—severe retention loss. Step-by-step inspection found the vacuum pump outlet check valve stuck half-open, causing vacuum backflow. Repair: Replaced the vacuum check valve (integrated in the vacuum line), cleaned the vacuum pump port, applied a thin layer of vacuum silicone grease on reassembly, and confirmed normal pressure retention. Fault resolved.
BYD DTC AI Analysis

Outdated IPB module software caused false fault codes.

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Vehicle: 2021 Song Plus DM-i, 21,000 km. Fault: C002192 sets intermittently during high-speed driving (>100 km/h), with the ESC OFF light flashing. Diagnosis: Checked vacuum system and power supply circuits; both normal. Fault frequency extremely low (once per month). Consulted BYD Technical Service Bulletin (TSB) and identified an IPB control software defect for this VIN range. The software falsely triggers pressure monitoring logic under specific combinations of vehicle speed and brake pedal rate. Resolution: Updated IPB module software to latest version (≥V2.3.5). No recurrence after one month of monitoring post-update.
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.