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 8

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 8 indicates a medium-severity SRS crash or acceleration sensor configuration error on circuit 4. The sensor, wiring pin assignment, or control module coding does not match the expected setup, which can affect airbag operation. Common causes include the wrong collision sensor being fitted or incorrect connector pin wiring after repair. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
4
Cases Logged
5
Causes
Likely Causes — Atto 8
  • 1Incorrect collision sensor installed: Using a non-OEM part or a sensor for the wrong model year/configuration (e.g., installing a DM version sensor on a petrol version, or swapping the left and right sensors) causes the fourth identification wire signal to mismatch ECU expectations.
  • 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) swaps positions with an adjacent pin, or the wiring harness has a short or open circuit.
  • 3SRS control module software version mismatch: The control unit software lacks the update matching the current hardware configuration, or sensor parameters remain unconfigured/uncoded after replacing the control module.
  • 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 sensor (front crash sensor, side crash sensor, or central sensor). Confirm no external impact damage. Check the connector for looseness, water ingress, or corrosion. Confirm the wiring harness is not crushed or damaged.
  • 3
    Check the sensor part number: Remove the sensor. Compare 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 fuel versions, and between 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 of the fourth wire to ground, to the power supply, and to other pins (must be greater than 10MΩ). Check harness continuity (resistance must be less than 1Ω) and confirm there is no short or open circuit.
  • 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 verifying the hardware, use the diagnostic tool to access the SRS system special functions. Execute the 'Sensor Configuration' or 'Crash Sensor Coding' procedure. 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 update to ensure the control unit software and hardware configuration are compatible.
  • 8
    Clear the fault code and verify: After completing the repair, clear the fault code and perform an ignition cycle test to confirm the fault code does not reappear. 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 8 Fault Codes
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.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.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 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.