AU
B170000

DTC B170000 indicates a configuration error on circuit 4 (typically the configuration identification line, backup signal line, or sensor type identification line) of the Supplemental Restraint System (SRS) crash or acceleration sensor — Atto 3

Safety System

DTC B170000 indicates a configuration error on circuit 4 (typically the configuration identification line, backup signal line, or sensor type identification line) of the Supplemental Restraint System (SRS) crash or acceleration sensor.

The SRS control unit detects that the connected sensor hardware model, wiring harness pin assignment, or internal coding data does not match the preset system configuration.

Circuit 4 typically handles sensor identification, redundant signal transmission, or address coding.

Incorrect circuit connections, incorrect sensor models (e.g., installing a left-side sensor on the right side or using a sensor from an incompatible model year), or incorrect control module software calibration trigger this fault.

This prevents the SRS from accurately determining the crash sensor status, potentially causing the airbags to fail to deploy during a collision or to deploy unintentionally.

This is a safety-critical fault.

The B170000 fault code on the Atto 3 indicates a configuration error in circuit 4 of an SRS crash or acceleration sensor. Severity is medium, but it affects airbag safety. Common causes include an incompatible crash sensor being fitted or incorrect wiring/pin placement after harness repair. The recommended fix is to visit an authorised dealer for sensor, wiring, and module checks. Typical repair cost data is available from recorded cases.
4
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Incompatible crash sensor installed: Using a non-genuine part or a sensor for the wrong model year/specification (for example, fitting a DM version sensor to a petrol version, or swapping the left and right positions) causes the fourth identification wire signal to differ from the ECU's expected value.
  • 2Incorrect pin insertion during wiring harness repair or modification: During accident repair or wiring modification, the fourth pin of the sensor connector (usually the configuration or identification wire) is swapped with an adjacent pin, or the wiring harness is shorted or open.
  • 3SRS control module software version mismatch: Control unit software lacks the required update for the current hardware configuration, or sensor parameters require configuration/coding after control module replacement.
  • 4Internal sensor configuration data corrupted: Electromagnetic interference, abnormal voltage, or physical impact corrupts the configuration data stored in the crash sensor's internal EEPROM, causing the fourth wire to transmit an incorrect identification code.
  • 5Multi-sensor system address conflict: On vehicles equipped with multiple crash sensors, two sensors share the same address code, causing a data conflict on the fourth wire (communication/address line).
What To Do
  • 1
    Use the BYD dedicated diagnostic tool (VDS2000/VDS3100) to read the complete fault code stream, confirm if B170000 is a current fault, check for accompanying fault codes (such as B16FF12 or other circuit short faults), and record the freeze frame data.
  • 2
    Visually inspect the physical condition of the relevant crash sensors (front crash sensor, side crash sensor, or central sensor) and confirm no external damage. Check the connector for looseness, water ingress, or corrosion. Confirm the wiring harness is not crushed or damaged.
  • 3
    Verify the sensor part number: Remove the sensor and check the part number, production date, and applicable model code on the label against the BYD EPC system. Confirm they match the vehicle VIN (note the differences between the Qin PRO DM and ICE versions, and the left and right positions).
  • 4
    Measure the electrical parameters of the fourth wire: Disconnect the sensor and ECU connectors. Use a multimeter to measure the resistance from the fourth wire to ground, power, and other pins (must be greater than 10MΩ). Check harness continuity (resistance must be less than 1Ω) and confirm no short or open circuits.
  • 5
    Check pin assignment: Refer to the workshop manual wiring diagram to confirm pin 4 of the sensor connector matches the corresponding SRS control module pin assignment. Check for backed-out, bent, or misaligned pins.
  • 6
    Perform sensor configuration/coding: After confirming the hardware is correct, use the diagnostic tool to access the SRS system special functions. Execute the "Sensor Configuration" or "Crash Sensor Coding" procedure and follow the prompts to enter the correct sensor serial number or select the correct configuration parameters.
  • 7
    Software update: Check the SRS control module for the latest software version. If available, perform the upgrade to ensure compatibility between the control unit software and the hardware configuration.
  • 8
    Clear fault code and verify: After completing repairs, clear the fault code and perform an ignition cycle test to confirm the fault code does not return. Use the diagnostic tool to read the sensor data stream and confirm the fourth wire status displays 'Normal' or 'Configured'.
Real-World Cases
BYD DTC AI Analysis

Replaced sensor with a used part on Qin Pro DM, causing configuration error

✓
A 2019 Qin PRO DM had its front crash sensor replaced with a unit salvaged from another vehicle following a minor front-end collision. Once fitted, the airbag warning light illuminated on the instrument cluster. Scanning revealed DTC B170000 (sensor fourth wire configuration error). Diagnosis showed the salvaged sensor had part number EF-3636100 (fits 2020 models), whereas this vehicle requires EF-3636000 (fits 2019 models). The fourth wire function differs between versions: it serves as an identification line on 2019 models and a communication line on 2020 models. Replaced it with a genuine sensor of the correct part number, performed the sensor configuration procedure, and cleared the fault.
BYD DTC AI Analysis

Misaligned pins after wiring harness repair caused the fault

✓
2018 BYD Qin Pro petrol. SRS warning light stayed on after accident repairs. Fault codes B170000 and B16FF12 were stored. Inspection found the left front impact sensor harness damaged in the accident. When re-crimping the connector, the technician swapped pin 4 (yellow wire, configuration line) and pin 3 (signal line). This caused the ECU to detect an abnormal voltage on wire 4 (always high). Corrected the pin positions per the wiring diagram, cleared the fault codes, and the system returned to normal.
BYD DTC AI Analysis

Outdated SRS module software causing false alarm

✓
The airbag warning light came on for no apparent reason during normal driving on a 2019 Qin Pro DM with no accident history. The scan tool retrieved DTC B170000. The sensor connector and wiring harness checked out fine, and the voltage on the fourth wire measured 2.5 V (within specification). A TSB search revealed a software bug in the SRS control module for this production batch that could cause false sensor configuration errors when ambient temperature dropped below -5 °C. Upgrading the SRS module software from V1.2 to V1.5 completely resolved the fault.
BYD DTC AI Analysis

Side impact sensors fitted on wrong sides (left and right reversed)

✓
A 2018 Qin Pro displayed an airbag warning on the instrument cluster after both side airbags were replaced. Stored fault codes were B170000 and B170100 (right sensor fourth wire configuration error). Inspection found the technician had installed the left B-pillar impact sensor (part number suffix -L) and the right sensor (suffix -R) in reversed positions. Although the connectors are identical, the internal address resistor values on the fourth wire differ (left 1.2kΩ, right 2.4kΩ). The ECU detected the address code from the sensor at the right-side position did not match the expected left-side value. After swapping the sensors to their correct positions, the fault was eliminated.
Other Atto 3 Fault Codes
P0AA6Hybrid Battery Voltage System Isolation FaultB1108For 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.B1109DTC B1109 indicates an open circuit in the communication line between the air conditioning system PM2.5 air quality sensor (dust concentration sensor) and the air conditioning control unit (AC ECU), or an open circuit within the sensor internal circuitry. Typically located in the air conditioning intake duct, this sensor monitors real-time PM2.5 particle concentration inside and outside the vehicle. It provides data to the automatic air conditioning system for intelligent switching between fresh air and recirculation modes and for controlling the air purification device. During an open circuit fault, the AC ECU cannot receive the air quality signal, triggering the system fail-safe mode. Symptoms typically include failure of the automatic recirculation function, abnormal air purification indicator light operation, or abnormal air quality data displayed on the air conditioning panel. Severe cases may compromise the cabin environment control strategy, but do not directly affect vehicle driving safety.B110AThis DTC indicates interrupted CAN bus communication or abnormal data between the air conditioning control unit (ACU) and the PM2.5 air quality sensor. The PM2.5 sensor monitors particulate concentration inside and outside the vehicle and provides the basis for purification control in the automatic air conditioning system. The ACU triggers this fault if it fails to receive a valid CAN message from the sensor within the specified period (usually 100-500 ms), if message verification fails, or if the signal frame times out. Although this fault does not affect vehicle driving safety, it disables the automatic air purification function. The air conditioning system cannot automatically switch between recirculation and fresh air modes or activate the air purification mode based on air quality. A persistent fault may restrict the thermal management strategy.B173A1ADTC B173A1A indicates the right middle-row side airbag (typically located on the side of the right second-row seat or inside the C-pillar trim panel) igniter circuit resistance measures 0 Ω. In the Supplemental Restraint System (SRS), normal airbag igniter resistance ranges between 2.0 and 5.0 Ω. A resistance of 0 Ω indicates a short to ground or a short between circuit wires, preventing the Airbag Control Unit (ACU) from establishing a normal monitoring circuit. This safety-critical fault prevents the airbag from deploying during a collision, continuously illuminates the instrument panel SRS warning lamp, and may force the entire airbag system into fail-safe mode.
Common problems reported for Atto 3 →Atto 3 overview →
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.