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C000A08

DTC C000A08 indicates the IPB (Integrated Power Brake) received a data packet from the ACC (Adaptive Cruise Control) controller containing a checksum error, missing data frame, or out-of-range signal — Atto 3

Braking System

DTC C000A08 indicates the IPB (Integrated Power Brake) received a data packet from the ACC (Adaptive Cruise Control) controller containing a checksum error, missing data frame, or out-of-range signal.

The ACC controller (typically integrated into the MRR [Mid-Range Radar]) calculates the distance, relative speed, and angle of the target vehicle ahead.

It transmits this information in real time via the CAN bus to the IPB to execute Automatic Emergency Braking (AEB) and Adaptive Cruise Control.

The IPB logs "ACC data corruption" when it detects a CRC failure, abnormal data length, physically unreasonable values (e.g., sudden distance jumps), or a communication timeout.

This fault deactivates the AEB and ACC functions and triggers the "Automatic Emergency Braking Limited" message on the instrument cluster.

Basic hydraulic braking typically remains unaffected.

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Cases Logged
Real-World Cases
BYD DTC AI Analysis

General Diagnostic Procedure for ACC Data Corruption (C000A08)

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Symptom: ACC failure, instrument cluster displayed brake system warning light, diagnostic tool read C000A08. Diagnosis: Checked CAN communication lines between MRR and IPB (measured CAN high + CAN low voltage sum), verified MRR supply voltage normal, inspected radar mounting position for accident-related misalignment. Resolution: Recalibrated MRR sensor (requires dedicated ADAS equipment), inspected and repaired wiring (cleaned ground point, replaced crooked connector), upgraded IPB system software or replaced MRR controller.
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BYD DTC AI Analysis

EPS System Fault Diagnosis Methods Reference (Wiring Harness Inspection)

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This case involves DTCs C1B1500 and C1B1600. Though addressing loss of EPS power steering assistance, the diagnostic procedure applies to C000A08: measure module supply voltage (check whether the ignition ON fuse is loose), verify connector voltage is within 10-16V, and inspect the wiring harness for open or short circuits. For C000A08, use the same approach to check the MRR controller power supply and communication lines for poor connections.
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BYD DTC AI Analysis

Reference case: Song DM leakage fault causing system communication failure

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DTCs: P1A0000 and others. Severe leakage (0.08 MΩ) with DC output at only 12.8 V caused low-voltage power supply faults. Vehicle presented with power steering failure, but voltage instability or leakage corrupts IPB-MRR controller communication packets, triggering C000A08 data corruption faults. Measure iron phosphate battery voltage stability, check the leakage sensor, and confirm the power system is normal before conducting ACC system diagnosis.
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BYD DTC AI Analysis

Steering System Sensor Calibration and Mechanical Inspection Reference

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DTCs: C1B0E00, C106600, and others. Symptoms include signal stuttering and angle inaccuracy. For C000A08, the MRR radar resembles the steering angle sensor—both require precise calibration. Key diagnostic steps: measure EPS module supply voltage, test sensor signals, check CAN network communication, and inspect external factors (e.g., vehicle level). The sensor recalibration procedure (requires specialist equipment) and the wiring harness ground point grinding method used here also work for ACC data corruption faults.
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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.