AU
B16F0-00

B16F0-00 indicates a short to body ground in the Supplemental Restraint System (SRS) Right Rear Impact Sensor signal circuit — Atto 3

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.

3
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 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 causes a short circuit between terminals (common after driving through water, rear windshield leaks, or spraying a high-pressure washer directly at the C-pillar area during car washes).
  • 3Internal electronic component fault in the right rear impact sensor causing the signal terminal to short to ground (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 rear dash cam).
  • 5Internal SRS ECU sampling circuit fault causing false detection (rare; consider only after verifying 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 the DTC, 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. Inspect the right rear impact sensor connector (located at the lower C-pillar or right rear side panel) for looseness, water ingress, or corrosion. Inspect the wiring harness for obvious damage.
  • 4
    Connector handling: Clean the connector terminals, apply conductive grease, reconnect and ensure full lock engagement. Clear the fault code and road test to verify.
  • 5
    Sensor replacement test: Disconnect the faulty sensor, replace it with a known-good sensor, clear the fault code, and observe if it recurs (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 verify there is 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) (should be >1 MΩ), and identify the short circuit location.
  • 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 check: 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 the system generates no new fault codes.
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 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: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.