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B16A7-00

The definition of DTC B16A7-00 varies across BYD vehicle platforms — Atto 3

Safety System

The definition of DTC B16A7-00 varies across BYD vehicle platforms.

In early models such as the Qin 100, Qin 80, and Qin EV450, this code indicates an internal fault in the SRS_ECU (airbag control unit).

It signifies an abnormality in the main control chip, internal memory, or ignition circuit driver, preventing the airbag system from executing collision detection and airbag deployment logic.

DM-i and e-Platform 3.0 models, such as the Qin PLUS, Song Pro, and Tang DM, often reuse this DTC as a hardware fault code for the seat occupancy recognition sensor (SBR) or the ultrasonic radar/blind spot monitoring radar.

This indicates the ECU received an invalid or out-of-range sensor signal.

Regardless of the definition, this fault causes the airbag system to enter degraded mode and illuminates the instrument cluster SRS warning lamp.

It may also cause seat belt pretensioner failure, airbag suppression, or a risk of unintended deployment.

Repair immediately.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Water ingress caused oxidation in the left rear radar wiring harness of the Song Pro, resulting in DTC B16A7-00

✓
Symptoms: Vehicle displays 'Please check radar system' on startup. Reversing radar inoperative, 360° camera black screen. Diagnostic tool reads DTC B16A7-00 (Left rear radar sensor fault). Diagnosis: Measured 0V supply voltage at left rear radar sensor. Inspected wiring harness connector inside bumper; found water ingress and oxidation, terminals corroded causing open circuit. Resolution: Cleaned oxidised terminals, sprayed WD-40 for rust prevention, rewrapped wiring harness with waterproof tape, cleared fault codes. System returned to normal.
Original source ↗
BYD DTC AI Analysis

Qin PLUS DM-i driver's seat occupancy sensor broken

✓
Symptoms: The instrument cluster displays 'Airbag System Fault' and the driver's seat occupancy indicator stays on continuously regardless of whether the seat is occupied. Diagnosis: VDS read DTC B16A7-00, pointing to the driver's seat occupancy sensor. Measuring the sensor resistance showed an open circuit (normal: 2.5-3.5kΩ). Inspection found a fractured pressure film inside the seat foam. Resolution: Replaced the driver's seat occupancy recognition sensor assembly (SA-3654200), performed sensor calibration using VDS, and cleared the fault codes. The system then operated normally.
Original source ↗
BYD DTC AI Analysis

Tang DM left rear blind spot monitoring radar damaged and bracket deformed

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Symptoms: Blind spot monitoring warning light flashed erratically while driving, and lane change assist failed. Stored DTC B16A7-00 (left rear blind spot radar signal abnormal). Diagnosis: Live data showed left rear radar signal strength at 0. Inspection found a minor impact dent on the surface of the left rear radar sensor on the rear bumper. Disassembly found internal transducer damage and bracket mounting angle offset by 15°. Solution: Replaced left rear blind spot monitoring radar sensor (3655100-XX). Readjusted mounting angle using dedicated calibration tool. Performed BSD system self-learning.
Original source ↗
BYD DTC AI Analysis

Han EV radar communication fault after OTA update

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After OTA update, display showed 'Parking Assist System Fault'. Front and rear radars inoperative. Read DTCs B16A7-00 and U0155-00 (radar communication fault). Diagnosis: Checked radar module power and CAN lines – both normal. Attempted programming; system returned 'Sensor Configuration Error'. Compared with a normal vehicle; found abnormal radar quantity configuration (configuration file missing). Solution: Rewrote radar configuration file using VDS2000. Ran 'Radar System Configuration', set correct radar count (front 4, rear 4). Activated each radar sensor individually; fault cleared.
Original source ↗
BYD DTC AI Analysis

Yuan Pro right rear center parking sensor internal short circuit

✓
Symptoms: When reverse gear is engaged, the parking sensor emits a continuous alarm despite no obstacles behind the vehicle. The display shows a fixed distance of 0.3 m. DTC B16A7-00 (right rear centre parking sensor fault). Diagnosis: Inspected the sensor surface and found paint residue. Cleaned the sensor, but the fault persisted. Removed the sensor and tested it with a direct power supply, finding a weak transmission signal. Measured the internal coil and identified a short circuit. Solution: Replaced the right rear centre parking sensor (3655400-XX). Performed radar position learning using a diagnostic tool. Tested all sensors and confirmed detection distances returned to normal.
Original source ↗
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.