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B16E0-00

DTC B16E0-00 indicates a short to ground in the Left Rear Impact Sensor signal circuit within the Supplemental Restraint System (SRS) — Qin Plus

Safety System

DTC B16E0-00 indicates a short to ground in the Left Rear Impact Sensor signal circuit within the Supplemental Restraint System (SRS).

This sensor typically mounts in the left rear quarter panel or C-pillar area to monitor collision acceleration at the left rear of the vehicle.

A short to ground indicates abnormal continuity (resistance below the normal range) between the sensor power wire, signal wire, or shield and the vehicle body metal frame.

This causes the SRS control module to receive a continuous low-level signal.

This fault forces the SRS into fail-safe mode and may cause the following: 1) The left rear side airbag/curtain airbag fails to deploy during an actual collision. 2) The system misinterprets the fault as a collision and inadvertently deploys the airbag. 3) Entire SRS functionality restricts, severely compromising passive safety performance.

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Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Qin EV300 left rear impact sensor short circuit after wading

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After driving through water about 30 cm deep, the airbag warning light on the instrument panel stayed on. Read fault code B16E0-00. Removed the left rear sill trim panel and found water inside the left rear impact sensor connector. Water caused a short circuit between pin 3 (signal wire) and pin 1 (ground). Dried the connector with compressed air, applied electronic contact cleaner, and replaced the seal ring. The fault cleared. Check the left rear quarter panel vent seal strip for deterioration.
BYD DTC AI Analysis

Wiring harness crimping after accident repair caused short circuit on Qin 100

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The vehicle was rear-ended on the left side. After the left rear quarter panel was replaced at an external repair shop, DTC B16E0-00 set. Inspection revealed that when reinstalling the interior trim panel, the technician had routed the left rear impact sensor harness (yellow corrugated tubing) beneath the seat mounting bolt. The bolt washer crushed the insulation, allowing the copper wires to contact the chassis directly. Re-routed the harness, secured it with dedicated clips, and replaced the damaged wire section. Fault cleared.
BYD DTC AI Analysis

Qin EV450 sensor internal short circuit

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The airbag warning light illuminated intermittently during normal use, with increased frequency in humid weather. A wiring harness check found no short to earth, but measuring the left rear impact sensor alone showed a resistance of only 12 Ω (normal is several kilohms). This pointed to an internal MEMS accelerometer circuit fault causing a power short to earth. Replaced the left rear impact sensor (part number 5A-3638400), performed configuration coding and adaptation, and fully resolved the fault.
BYD DTC AI Analysis

Retrofitting a reversing camera damaged the wiring harness.

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The owner installed a surround-view camera system themselves. While drilling to route wiring on the left rear side, the drill bit damaged the factory left rear impact sensor harness, breaching the insulation and exposing the copper core. The exposed core contacted the body metal, triggering DTC B16E0-00. Removed the left rear quarter trim panel and found a ~3mm wound in the harness from the drill. Cut out the damaged section, spliced in a heat-resistant wire (0.5mm², 125°C rated) by soldering, and sealed with double-layer heat shrink tubing. Normal operation restored.
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.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.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.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.
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.