AU
B167D00

This DTC indicates the internal parameters of the right rear side impact sensor (typically located in the right C-pillar or rear door frame area for side impact detection) exceed the normal tolerance range or fail validation — Qin Plus

Safety System

This DTC indicates the internal parameters of the right rear side impact sensor (typically located in the right C-pillar or rear door frame area for side impact detection) exceed the normal tolerance range or fail validation.

Unlike a simple communication error, this fault confirms a normal communication link between the sensor and the SRS control module.

However, the sensor detected abnormal internal calibration data, sensitivity parameters, or zero-point offset during self-check.

Potential causes include corrupted internal sensor EEPROM data, physical characteristic drift from long-term use, A/D conversion errors resulting from unstable supply voltage, or internal accelerometer reference shift due to sensor installation stress deformation.

This fault prevents the SRS system from accurately determining right-side impact severity.

It may delay or incorrectly trigger the side airbag or side curtain airbag, severely compromising passive safety performance.

The system typically defaults to a degraded protection mode.

The B167D00 fault code on the Qin Plus indicates the right rear side impact sensor has internal calibration or parameter faults, exceeding normal tolerance despite communicating properly with the SRS module. Severity is medium. Common causes include corrupted sensor EEPROM data or mounting bracket deformation causing physical offset. Repair requires visiting an authorised dealer. Typical repair cost data is available based on 4 recorded cases.
4
Cases Logged
5
Causes
Likely Causes — Qin Plus
  • 1Sensor internal calibration data is corrupted or missing (EEPROM fault), causing parameter verification failure during self-check.
  • 2Sensor mounting bracket looseness, deformation, or stress concentration causing a physical offset of the internal accelerometer reference.
  • 3Excessive voltage drop in the power supply circuit (contact resistance >1Ω) or poor ground connection, causing the operating voltage to fall outside the standard 5V±0.25V range.
  • 4Backed-out terminals, oxidation, or water ingress at the harness connector causing signal interference or momentary voltage drop.
  • 5Installing a non-genuine sensor after a vehicle accident, failing to perform the calibration procedure, or a severe impact damaging the sensor's internal chip.
What To Do
  • 1
    Use the BYD VDS diagnostic tool to read the DTC freeze frame data. Record key parameters during the fault, including ambient temperature, battery voltage, and vehicle status, to determine if the fault is intermittent.
  • 2
    Disconnect the battery negative terminal, wait 3 minutes, and remove the right rear C-pillar interior trim panel. Visually inspect the crash sensor for physical damage or cracks, verify the mounting bolt torque (standard is usually 8-10 N·m), and check the bracket for deformation.
  • 3
    Disconnect the sensor connector (usually 2-3 pins). Check the terminals for backed-out pins, corrosion, signs of water ingress, or green copper corrosion. Measure the supply voltage on the wiring harness side (should be 5V±0.25V) and the ground resistance (<1Ω).
  • 4
    Check the communication circuit (LIN line or CAN-H/L) between the sensor and the SRS module for continuity and insulation to ground and power. Verify there are no short or open circuits, and the waveform shows no abnormal distortion.
  • 5
    If circuit measurements are normal, reconnect the sensor. Power on the vehicle and perform the 'SRS System Calibration' or 'Crash Sensor Zero-Point Calibration' function (requires the OEM diagnostic tool; for some models, leave the vehicle stationary on a level surface for 3 minutes before performing this calibration).
  • 6
    If calibration fails, will not execute, or the fault recurs, replace the OEM right rear side impact sensor (verify the part number matches the vehicle model year). During installation, tighten strictly to the standard torque (9N·m). Do not overtighten.
  • 7
    After replacement, perform sensor initialization and calibration, clear fault codes, and conduct a road test (including rough roads and cornering). Read the data stream again to confirm sensor parameters are within the normal range.
Real-World Cases
BYD DTC AI Analysis

Qin Pro DM right rear crash sensor loose mounting caused parameter drift

✓
2019 Qin Pro DM, airbag warning light constantly on. Retrieved DTC B167D00, could not clear. The owner said they had removed the right rear C‑pillar trim panel for an audio upgrade. Found the sensor mounting bolt hand‑tightened only, not to standard torque, and the weatherstrip misaligned, causing moisture inside. Removed the sensor and found slight oxidation on the mounting surface. Re‑tightened the sensor to 9 N·m torque, fixed the wiring harness waterproofing, and ran the sensor calibration procedure. Fault resolved.
Original source ↗
BYD DTC AI Analysis

E2 EV wiring harness pin backing out causing intermittent parameter error

✓
2020 E2. When driving on rough roads, the airbag warning light intermittently illuminated. The scan tool retrieved stored DTC B167D00. Inspected the right rear side impact sensor connector GJK08 (located at the right rear sill harness junction) and found pin 2 (power supply) had backed out 0.5 mm, causing supply voltage to fluctuate between 4.2–5.8 V, outside the sensor's normal operating range. Reseated the pin and applied conductive grease. Voltage measured stable at 5.02 V. Cleared the fault and road-tested for 20 km; the fault did not return.
Original source ↗
BYD DTC AI Analysis

Poor sensor grounding in the Qin EV causes internal AD conversion fault.

✓
2019 BYD Qin EV. After accident repairs to the right rear quarter panel, the vehicle continuously set DTC B167D00. The right side curtain airbag deployed during the collision. Replaced the right rear impact sensor with a brand new genuine unit, but the fault remained. A multimeter test showed the accident had damaged the sensor earth wiring harness, resulting in an earth resistance of 12Ω (spec: <1Ω). This caused the sensor's internal ADC reference voltage to drift. Re-routed the earth wire and connected it to the vehicle's main earth point G301. Earth resistance then measured 0.3Ω. Cleared the fault codes, the system returned to normal, and the data stream displayed normal sensor parameters.
Original source ↗
BYD DTC AI Analysis

E3 model sensor internal EEPROM low-temperature failure

✓
2020 model year E3. The owner reported the airbag warning light illuminated during winter morning startups and extinguished automatically after 10 minutes of driving. The diagnostic tool read current DTC B167D00. Reproduced the fault in a -5°C environmental chamber; the data stream showed the sensor temperature compensation parameters were out of tolerance. Found poor low-temperature characteristics in the sensor's internal memory chip. Replaced the right rear side impact sensor (part number SC-3636900). The fault did not recur during high/low temperature cycling tests from -20°C to 60°C.
Original source ↗
Other Qin Plus Fault Codes
B1108For 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.B110913DTC B110913 indicates an open signal circuit for the PM2.5 rapid detector (in-cabin air quality sensor). This sensor typically mounts inside the air conditioning system intake duct. It monitors in-cabin PM2.5 concentration in real time and provides data to the automatic air conditioning system for intelligent control of the air purification function. The BYD diagnostic protocol uses sub-code '13' to specifically indicate an open signal circuit. Although this fault theoretically affects a comfort feature, BYD Qin series vehicles classify it as a Level 3 (severe) fault. This classification occurs because the air conditioning system interacts with the battery thermal management system (e.g., monitoring battery cooling intake air quality). The fault can disable the automatic air conditioning mode and prevent the air purification function from operating. In extreme cases, it affects the battery compartment intake air quality assessment, triggering the 'repair immediately' strategy.B110BDTC B110B indicates a fault in the internal air pump (sampling pump) of the PM2.5 air quality detector. This pump draws cabin or outside air into the PM2.5 sensor detection chamber, enabling the laser scattering sensor to measure real-time particulate matter concentration. The air conditioning controller (or BCM) sets this DTC upon detecting an open or short circuit in the pump drive circuit, or abnormal current caused by a seized pump motor. This fault disables the "Green Clean" system, causes the instrument cluster air quality display to read abnormally or disappear, and disables the automatic fresh air/recirculation switching function. It does not affect the vehicle powertrain or core thermal management functions.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.B173BDTC B173B indicates an abnormal electric A/C compressor speed feedback signal or a communication fault between the compressor controller and the motor. In BYD new energy models (e.g., Tang, Song, Qin, and Yuan series), this DTC belongs to the HVAC subsystem within the Body Control system and specifically involves the electric compressor closed-loop control circuit. The ECU sets this DTC when the compressor controller (IPM) fails to receive a valid pulse signal from the Hall speed sensor for more than 3 continuous seconds, or when the deviation between the detected actual speed and the target commanded speed exceeds the calibrated threshold (typically >500 rpm). This fault forces the A/C system into fail-safe mode and stops compressor operation. Symptoms include a complete lack of cooling, intermittent cooling, or a sharp decrease in cooling performance. The instrument cluster A/C warning lamp may also illuminate. Prolonged operation with this fault can degrade high-voltage system insulation or cause controller overcurrent damage.
Common problems reported for Qin Plus →Qin Plus 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.