AU
B167E00

This DTC indicates interrupted data communication between the Airbag Control Unit (ACU) and the right rear Side Impact Sensor (SIS) — Atto 3

Safety System

This DTC indicates interrupted data communication between the Airbag Control Unit (ACU) and the right rear Side Impact Sensor (SIS).

The sensor typically mounts inside the right rear door trim panel or below the C-pillar and connects to the ACU via a LIN bus or hardwire connection.

The fault occurs when the ACU fails to receive a valid data frame from the sensor within the specified time window (typically 100-500ms) or receives incorrect checksum data.

Consequently, the ACU cannot obtain real-time collision acceleration data from the vehicle's right rear, directly affecting the deployment logic for the side and curtain airbags.

The system enters fail-safe mode, illuminates the airbag warning lamp, and may disable the right-side airbag circuit.

This condition can prevent proper airbag deployment during a side collision, posing a severe safety risk.

4
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Long-term repeated bending at the door hinge breaks the internal wire or damages the insulation of the right rear door wiring harness, causing a LIN line open circuit or intermittent poor contact.
  • 2Water ingress and oxidation in the sensor connector (commonly due to vehicle wading, high-pressure car wash fluid seepage, or aging door seals), causing a short circuit between terminals or increased resistance.
  • 3Right rear side impact sensor internal fault (e.g., damaged MEMS accelerometer chip, communication IC fault, or internal power supply circuit failure)
  • 4A LIN bus circuit short to ground or power, or an abnormal increase in circuit resistance (greater than 2Ω), causes communication signal attenuation.
  • 5SRS control unit internal communication interface driver circuit fault (less common; usually occurs with multiple sensor communication fault codes)
What To Do
  • 1
    Use the BYD VDS 2000 or Launch X431 diagnostic tool to read all DTCs. Confirm whether B167E00 is a current or historical fault. Check for accompanying B167D00 (parameter error) or U-series communication fault codes.
  • 2
    Disconnect the battery negative terminal and wait 3 minutes for the SRS system capacitor to discharge. Remove the right rear door trim panel. Visually inspect the side impact sensor (part number usually starts with 95920-) for secure mounting and physical damage.
  • 3
    Disconnect the sensor connector and inspect the terminals for backed-out pins, corrosion, water ingress, or looseness. Clean the terminals with electrical contact cleaner and measure the resistance between the connector terminal and ground (should be less than 1Ω).
  • 4
    Keep the ignition switch OFF. Measure the voltage to ground of the LIN wire (usually pink/green) at the sensor harness connector (normal: approx. 8-12V) and check the waveform (should be a 12V square wave). Measure the continuity between the ground wire (black) and body ground (should be less than 0.5Ω).
  • 5
    Inspect the door wiring harness for wear at the hinge. Peel back the corrugated conduit to check for broken wires. If a wire is broken, repair it using a waterproof solder joint and add protective sleeving to reinforce the repair.
  • 6
    Perform a component swap test: Swap the right rear and left rear sensors. If the fault code moves to the left side (B167C00 appears), the sensor is faulty. Replace the sensor.
  • 7
    After repairing the wiring harness or replacing the sensor, reconnect the battery, clear the fault code using the diagnostic tool, and perform the 'SRS System Calibration' or 'Crash Sensor Configuration' procedure (if applicable).
  • 8
    Perform a system self-check: cycle the ignition switch 3 times and verify the airbag warning lamp turns off after the self-check. Perform a road test or simulated vibration test and verify the fault does not recur.
Real-World Cases
BYD DTC AI Analysis

Qin Pro DM right rear door wiring harness broke at the hinge, causing communication interruption.

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Model: 2019 Qin PRO DM, Mileage: 32,000 km. Symptoms: Airbag warning light illuminated intermittently while driving and extinguished after stopping and restarting; frequent on rainy days. Diagnosis: Retrieved DTC B167E00 (current). Measured sensor power supply as normal, but LIN bus voltage fluctuated between 5-9V (unstable). Removed the right rear door trim and inspected the wiring harness at the door hinge. Found the LIN wire (pink-green) had completely fractured inside the corrugated tubing, with only a few copper strands maintaining connection due to metal fatigue from repeated door opening and closing. Repair: Cut out the damaged harness section, soldered with waterproofing, and sealed with heat shrink tubing. Rerouted the wiring with additional slack and secured the harness to prevent excessive bending. Cleared the fault codes and monitored for one month without recurrence.
BYD DTC AI Analysis

Sensor connector corroded and oxidized after water wading

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Vehicle: 2018 Qin Pro (petrol variant) Symptoms: Airbag warning light stayed on constantly the day after driving through heavy floodwater, and the right rear window worked intermittently. Diagnosis: Retrieved DTCs B167E00 and B167D00. Removed the right rear door trim panel and found visible water droplets inside the side impact sensor connector. Terminals showed green corrosion, and resistance between terminals measured 12Ω (abnormal). Solution: Thoroughly cleaned the connector terminals with anhydrous alcohol and electronic contact cleaner, blow-dried them, applied conductive grease, and replaced the connector seal. Also cleared the door drain holes and checked the waterproof membrane seal. Fault eliminated after repair.
BYD DTC AI Analysis

Internal IC thermal stability failure in the sensor

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Vehicle: 2019 Qin Pro DM Symptoms: During summer, when ambient temperature exceeds 35°C, the airbag warning light illuminates intermittently. In the early morning or shaded areas, the light stays off. Diagnosis: When the fault occurred, we pulled DTC B167E00 with no history faults. The fault disappeared after the vehicle cooled for 1 hour. Wiring harness continuity and voltage were normal. However, the LIN bus waveform showed heavy noise when the fault was active. After letting the vehicle bake in direct sunlight for 2 hours, we measured normal power supply at the sensor but no LIN signal output. Solution: Replaced the right rear side impact sensor (part number: 95920-XXXXX). After replacement, we tested the vehicle in high-temperature conditions for three consecutive days, and the fault did not recur. Root cause: poor thermal stability of the sensor's internal communication chip.
BYD DTC AI Analysis

Aftermarket door audio installation damaged the wiring harness

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Model: Qin Pro Fuel 2018 Symptom: The airbag warning light came on after the owner modified the right rear door speaker. Diagnosis: Read DTC B167E00. Inspection found that the mounting screws for the modified speaker had penetrated the door wiring harness protective sleeve, crushing and damaging both the LIN wire and ground wire and causing an intermittent short circuit. Solution: Removed the mounting screws, repaired the damaged wiring harness (re-wrapped with insulation tape and corrugated tubing), and rerouted the harness away from the modified components. Cleared the fault codes and the system returned to normal. Advised the owner to get electrical modifications done at a 4S dealership or professional modification workshop.
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.