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B168A00

DTC B168A00 indicates the Airbag Control Unit (ACU) detects the configuration parameters for Circuit 6 (typically the right side airbag/side curtain or right rear side airbag ignition circuit) do not match the system calibration data — Atto 3

Safety System

DTC B168A00 indicates the Airbag Control Unit (ACU) detects the configuration parameters for Circuit 6 (typically the right side airbag/side curtain or right rear side airbag ignition circuit) do not match the system calibration data.

This is an SRS configuration fault, not a simple open or short circuit. "Invalid configuration" means the control unit's internal algorithm detects the circuit's electrical characteristics (such as squib resistance, capacitance, or internal ECU configuration code) differ from the vehicle factory settings or current hardware configuration.

This condition can prevent the airbag from deploying correctly or cause unintended deployment during a collision, constituting a Level 2 safety fault.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Qin Pro DM logged DTC B168A00 after fitting a salvage ACU.

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After accident repairs, technicians fitted a 2019 Qin PRO DM with a used airbag control unit from another vehicle. Once installed, the instrument panel airbag warning light stayed on, and they read DTC B168A00. Diagnosis revealed the replacement ACU stored a base model configuration code (without side curtain airbags), while the vehicle actually had side curtain airbags. They used the VDS diagnostic tool to execute the ‘Replace SRS ECU’ function, rewriting the vehicle’s VIN and high-spec model configuration code. This cleared the fault.
BYD DTC AI Analysis

Right front seat modification caused circuit 6 impedance fault

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The owner of a 2018 Qin PRO petrol variant reported the airbag warning light occasionally coming on. Retrieved DTC B168A00. Inspection found the owner had previously fitted full-coverage seat covers; the fastening clips had pierced the right front seat side airbag harness, causing circuit 6 resistance to fluctuate between 1.2–3.5Ω. Repaired the harness and remeasured resistance at 2.0Ω. Cleared the DTC and no faults returned after 3 days of use.
BYD DTC AI Analysis

Software version too low to recognise new components

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After the dealership replaced the right side airbag module, a 2019 Qin PRO DM set DTC B168A00. Replacing the module multiple times did not resolve the issue. Inspection found the ACU software was an early 2018 version, while the new airbag module had an improved igniter design. Solution: Upgraded the SRS control unit software to the latest version (post-October 2019), reconfigured the loop parameters, and resolved the fault.
BYD DTC AI Analysis

Oxidised SRS connector on flood-damaged vehicle caused configuration failure

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Repaired a Qin PRO DM that had been driven through water. Afterwards, the airbag warning light came on with DTC B168A00. Found water inside the lower right B-pillar SRS harness connector; oxidised and blackened pins increased contact resistance to 4.5 Ω, causing the control unit to misread as 'invalid configuration'. Cleaned the connector and applied conductive paste; resistance then measured 1.9 Ω. Cleared the fault code and the system returned to normal.
BYD DTC AI Analysis

A wiring harness bridge repair after an accident caused a fault.

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While repairing right-side accident damage on a Qin PRO, a workshop incorrectly cross-connected the Loop 6 (side airbag) and Loop 5 (the other side airbag) wiring harnesses. This caused the ACU to detect that the electrical characteristics of Loop 6 did not match the stored configuration template. After reconnecting the harnesses according to the circuit diagram to ensure the left and right circuits were independent and had normal resistance, the fault code cleared automatically.
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.