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B16E200

DTC B16E200 indicates the SRS (Supplemental Restraint System) control module detects a configuration data mismatch for the Left Rear Impact Sensor — Atto 3

Safety System

DTC B16E200 indicates the SRS (Supplemental Restraint System) control module detects a configuration data mismatch for the Left Rear Impact Sensor.

Specifically, the sensor calibration parameters, hardware serial number, or installation position coding stored in the control module do not match the physical characteristics of the connected Left Rear Impact Sensor.

This is a software/configuration fault, not a hardware open or short circuit.

This fault causes the SRS to enter a degraded mode.

The left rear impact detection function may fail or operate with abnormal trigger thresholds, affecting the deployment logic of the side curtain airbags and seat belt pretensioners.

However, it typically does not disable the entire airbag system.

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Cases Logged
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Causes
Likely Causes — Atto 3
  • 1Failure to perform the 'Sensor Online Configuration' or 'Coding' procedure using the VDS diagnostic tool after replacing the left rear crash sensor causes the new sensor hardware ID to mismatch the record stored in the control module.
  • 2Outdated SRS control module software or a corrupted configuration data area (e.g., EEPROM data loss caused by disconnecting vehicle power during repairs or battery depletion) prevents the module from correctly identifying original sensor parameters.
  • 3Mistakenly installing the right rear crash sensor on the left side during repairs, or using a non-genuine part (aftermarket parts lack the original configuration coding), causes a position identification conflict.
  • 4After a vehicle collision, the SRS control module latched abnormal sensor status data; the historical configuration cache was not cleared after installing a new sensor.
  • 5A BYD VDS system interruption during a software update or module programming caused a left rear sensor configuration byte write failure or checksum error.
What To Do
  • 1
    Connect the BYD VDS3000 diagnostic tool. Enter the SRS system to read the complete fault codes and freeze frame data. Record the current left rear crash sensor part number and hardware version. Check for other accompanying fault codes (such as B16E100 communication fault or B16E300 hardware fault).
  • 2
    Visually inspect the left rear crash sensor installation position (usually located inside the C-pillar trim panel or on the rear bumper left bracket). Confirm the sensor is not reversed, the connector shows no oxidation or corrosion, and the wiring harness has no pinches or damage. Verify the left/right marking (L/R mark) on the sensor housing matches the installation position.
  • 3
    In the VDS diagnostic tool, select 'Special Functions' → 'Crash Sensor Configuration' or 'ECU Configuration' and execute the online matching procedure for the left rear crash sensor: enter the new sensor barcode or automatically read the sensor ID, then write it to the SRS control module configuration storage area. After completing the configuration, confirm the system displays 'Configuration Successful'.
  • 4
    If configuration fails or indicates hardware incompatibility, check the SRS control module software version. If necessary, update the control module software (flash the latest version of the SRS control program). After completing the update, retry the sensor configuration.
  • 5
    After completing the configuration, clear the fault code and read the sensor data stream. Confirm the left rear crash sensor real-time acceleration value, status bit, and configuration status display normally. Perform a simulated crash test using the diagnostic tool's 'Sensor Test' function to verify signal response. Finally, perform a road test to verify the fault light remains off.
Real-World Cases
BYD DTC AI Analysis

Sensors not configured after rear bumper replacement caused fault.

✓
After a rear-end collision, a 2019 BYD Qin Pro DM received a new rear bumper assembly including the left rear collision sensor. The technician did not configure the sensor after installation. The SRS warning light on the instrument panel stayed on the next day, with DTC B16E200 stored. Diagnosis found the new sensor part number matched the original, but the VDS showed the sensor as "not configured." The technician performed the "collision sensor online configuration" routine and entered the new sensor serial number. The fault cleared and the data stream showed the left rear sensor status returned to normal.
BYD DTC AI Analysis

Flat battery caused configuration data loss

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A 2020 BYD E3 suffered severe battery drain after long-term parking. Jump-starting brought on the SRS light. Fault code B16E200 stored, along with communication fault history in multiple control modules. Inspected the left rear impact sensor connector – normal. Attempted to reconfigure the sensor using VDS, but the system displayed 'Configuration data validation failed'. Determined the SRS control module had internal EEPROM data corruption. Performed a software upgrade on the control module to refresh its firmware. After that, successfully reconfigured the left rear sensor parameters, resolving the fault.
BYD DTC AI Analysis

Swapped left and right sensor mounting positions

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A 2019 BYD E2 underwent C-pillar sheet metal repair. When reinstalling the impact sensors afterwards, the technician swapped the left and right positions (left rear sensor fitted to the right side, right rear sensor fitted to the left side). After starting the vehicle, it simultaneously set DTCs B16E200 (Left Rear Configuration Error) and B16F200 (Right Rear Configuration Error). VDS live data showed the left and right sensor IDs were opposite their actual installation positions. The technician removed the C-pillar trim panels, swapped the sensors back to their correct locations, cleared the fault codes, and the system returned to normal. This confirmed the configuration errors were caused by a mismatch between sensor physical positions and software configuration.
BYD DTC AI Analysis

Used second-hand parts without reconfiguration

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A used left rear impact sensor from a crashed car was installed on a 2018 BYD Qin Pro petrol vehicle during repairs. After installation, the dashboard displayed an SRS fault. The technician retrieved DTC B16E200. The sensor looked undamaged, but VDS showed 'Hardware ID Mismatch'. The used sensor had retained the donor vehicle's configuration data, making it incompatible with the host vehicle's SRS control module. Installing a brand new genuine sensor and performing online configuration resolved the fault. Used impact sensors are not plug-and-play; they require configuration matching.
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: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.