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B163111

DTC B163111 indicates the SRS (Supplemental Restraint System) control module detects an abnormally low-resistance path to body ground (short to ground) in the front passenger side airbag squib circuit (typically the seat side airbag or curtain airbag) — Atto 3

Safety System

DTC B163111 indicates the SRS (Supplemental Restraint System) control module detects an abnormally low-resistance path to body ground (short to ground) in the front passenger side airbag squib circuit (typically the seat side airbag or curtain airbag).

Under normal operating conditions, the airbag squib circuit resistance must remain around 2-3 Ω, and the insulation resistance to ground must exceed 1 MΩ.

The control module logs a short to ground when it detects circuit resistance approaching 0 Ω or current leaking to ground.

This fault prevents the side airbag from deploying during a side-impact collision, eliminating side-impact protection for the occupant.

The circuit abnormality also creates a potential risk of unintended deployment, although a short to ground typically causes a non-deployment failure rather than accidental triggering.

This fault constitutes a severe active safety system failure.

Remove the vehicle from service immediately until repaired.

3
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Atto 3 (Yuan Plus) B-pillar wiring harness wear caused short circuit

✓
The airbag warning light on the instrument cluster was on constantly. VDS diagnosis showed DTC B163111. The technician disconnected the battery, removed the passenger-side B-pillar trim panel, and found that the wiring harness below the B-pillar interfered with the seat metal frame when the seat was moved to its rearmost position. Long-term friction had worn through the insulation of the yellow airbag wire, exposing the copper conductors and causing a short to ground against the vehicle body. The technician repaired the damaged wires with heat shrink tubing, rerouted the harness, and secured it with additional clips to maintain a clearance of more than 20 mm from the seat mechanism. Fault resolved.
Original source ↗
BYD DTC AI Analysis

BYD Song Pro seat connector oxidised due to water ingress

✓
Intermittent airbag light, sometimes with a warning chime. DTC B163111. Checked the airbag connector under the passenger seat and found water stains and green copper corrosion inside the plug, with terminals displaced. Traced the cause to liquid that got in during a previous deep interior clean, combined with an aged connector seal. Cleaned the connector terminals with electronic cleaner and fine sandpaper, applied conductive grease, replaced the seal, and secured the plug with a zip tie to prevent it from coming loose. The fault has not returned.
BYD DTC AI Analysis

Internal fault in BYD Qin Pro passenger airbag module

✓
The airbag warning light stayed on continuously. The diagnostic tool showed code B163111. Initial inspection found no damage to the external wiring harness and the connectors looked normal. After disconnecting the airbag module, the harness-side insulation resistance to ground measured normal (greater than 10 MΩ). Measuring the module itself, however, showed near-zero resistance to ground on one terminal, indicating an internal squib short circuit. Replaced the genuine front passenger side airbag module (part number matched to the VIN), then coded and configured it using the diagnostic tool. Cleared the fault codes and the system passed the self-test. Fault resolved.
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: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.