AU
B16F0-00

B16F0-00 indicates a short to body ground in the Supplemental Restraint System (SRS) Right Rear Impact Sensor signal circuit — Atto 8

Safety System

B16F0-00 indicates a short to body ground in the Supplemental Restraint System (SRS) Right Rear Impact Sensor signal circuit.

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

The SRS ECU logs this fault code when it detects abnormal voltage to ground on the sensor signal wire (continuous low level or excessively low impedance).

This fault prevents the SRS ECU from accurately receiving the right rear impact signal.

It may cause the airbag system to fail to deploy correctly during a side or rear impact, or to deploy inadvertently under normal conditions.

Consequently, the system enters fail-safe mode, illuminates the airbag warning light, and may disable certain airbag functions.

The B16F0-00 fault code on the Atto 8 indicates a short to body ground in the SRS right rear impact sensor signal circuit. This is a high-severity airbag system fault that can affect correct deployment and trigger fail-safe mode. Common causes include damaged wiring near the C-pillar or rear bumper area, or water ingress and corrosion in the sensor connector. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available from recorded cases.
3
Cases Logged
5
Causes
Likely Causes — Atto 8
  • 1Damaged insulation on the right rear impact sensor wiring harness causing a short to the body (commonly due to chafing at the C-pillar wiring hole or the edge of the rear bumper mounting bracket)
  • 2Water ingress or corrosion in the sensor connector causing a short circuit between terminals (common after water fording, rear windshield leaks, or spraying high-pressure water directly at the C-pillar during car washes)
  • 3Internal electronic component failure in the right rear impact sensor causing a short to ground at the signal terminal (sensor internal short circuit).
  • 4Vehicle modification damaged the wiring harness (e.g., fixing screws crushed the harness or drilling damaged it when installing a reversing camera, parking sensors, or a dashcam rear camera).
  • 5SRS ECU internal sampling circuit fault causing misjudgment (rare; consider only after verifying the wiring harness and sensors are normal)
What To Do
  • 1
    Safety preparation: Disconnect the battery negative terminal and wait 3 minutes for the SRS capacitor to discharge to ensure safe operation.
  • 2
    Fault confirmation: Connect the diagnostic tool to read DTCs, confirm B16F0-00 is a current fault (Active), and record the freeze frame data.
  • 3
    Visual inspection: Remove the right C-pillar trim panel and rear bumper liner. Check the right rear impact sensor connector (located at the lower C-pillar or right rear side panel) for looseness, water ingress, or corrosion. Check the wiring harness for obvious damage.
  • 4
    Connector treatment: Clean the connector terminals, apply conductive grease, reconnect and verify full lock engagement, clear the fault code, and road test to verify.
  • 5
    Sensor substitution test: Disconnect the faulty sensor and replace it with a known-good sensor. Clear the fault code and observe if it returns (to distinguish between a sensor fault and a wiring harness fault).
  • 6
    Harness continuity check: Disconnect the SRS ECU (K21) and sensor (K06) connectors, measure the resistance between the harness terminals (should be <1Ω), and confirm no open circuit.
  • 7
    Insulation-to-ground check: Measure the resistance to body ground of the sensor signal wire (K21-29 to K06-1, L/Y wire) and the ground wire (K21-30 to K06-2, G/Y wire) (must be >1 MΩ) and locate the short circuit.
  • 8
    Harness repair: Wrap damaged areas with waterproof insulating tape, install corrugated conduit for protection, and adjust harness routing to avoid contact with sharp edges.
  • 9
    ECU inspection: If the wiring harness and sensor are normal, measure the voltage at the corresponding SRS ECU terminal. Replace the SRS ECU if necessary.
  • 10
    Final verification: Restore all connections, clear the fault codes, perform a bumpy road test and SRS system self-check, and confirm the warning light turns off and no new fault codes appear.
Real-World Cases
BYD DTC AI Analysis

BYD Qin - Water ingress in right rear impact sensor connector caused short to ground

✓
The SRS warning light on a 2017 BYD Qin EV300 turned on suddenly after driving in wet weather. The scan tool retrieved DTC B16F0-00. Inspection beneath the right C-pillar revealed water inside the sensor connector, with the terminals showing oxidation and corrosion. The root cause was a deteriorated rear windscreen seal that allowed rainwater to track down the C-pillar and enter the connector, shorting the signal terminal to ground. Repair: cleaned the connector terminals, dried with compressed air, applied waterproof conductive grease, replaced the rear windscreen seal, and re-routed the wiring harness to prevent water pooling. Cleared the fault codes and road tested—fault resolved.
Original source ↗
BYD DTC AI Analysis

BYD Qin - Retrofitted reversing camera caused wiring harness chafing and a short to ground.

✓
A 2018 BYD Qin EV450 presented with the SRS warning light constantly illuminated one week after a reversing camera installation at a third-party accessory shop. Diagnostic scan revealed DTC B16F0-00. Investigation showed the installer had routed the rear camera harness through the same C-pillar grommet used by the right rear impact sensor wiring, and a fixing screw pressed directly on the sensor harness. This damaged the insulation, exposing copper conductors and causing a short to earth against the bodywork. Repaired the damaged harness by wrapping with insulation tape and fitting corrugated tubing, rerouted the camera harness to avoid interference with the factory harness, and replaced the fixing screw with a dedicated wiring clip. Cleared the fault code and confirmed the system returned to normal operation.
Original source ↗
BYD DTC AI Analysis

BYD Qin – Internal fault in right rear impact sensor causing short circuit

✓
A 2017 Qin 100 with no accident history had an SRS warning lamp that illuminated intermittently. The diagnostic scanner showed DTC B16F0-00. Initial inspection found the wiring harness visually undamaged and connectors in good condition. Swapped the right and left rear impact sensors for a substitution test. After clearing DTCs and road testing, the fault code changed to B1677-00 (left rear impact sensor short to ground), confirming the fault moved with the sensor. Disassembling the faulty sensor revealed the internal piezoelectric element seal had failed, causing a short circuit. Replaced the right rear impact sensor (part number per vehicle configuration), installed with the arrow pointing forward (crash sensing direction), and tightened to the specified torque (9-11 N·m). Replacing the sensor resolved the fault completely.
Original source ↗
Other Atto 8 Fault Codes
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.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 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.