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B16F0-00

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

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 Qin Plus indicates a short to body ground in the SRS right rear impact sensor signal circuit. This is a high-severity airbag system fault that may affect correct deployment or trigger fail-safe mode and the airbag warning light. Common causes include damaged wiring near the C-pillar or rear bumper bracket, or water/corrosion in the sensor connector. Visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
3
Cases Logged
5
Causes
Likely Causes — Qin Plus
  • 1Right rear impact sensor wiring harness insulation damaged, causing a short to the body (common chafing points: C-pillar wiring pass-through and 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 the C-pillar directly with a high-pressure washer).
  • 3Internal electronic component failure in the right rear impact sensor causes the signal terminal to short to ground (internal sensor 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 false detection (rare; consider only after verifying wiring harness and sensors are normal)
What To Do
  • 1
    Safety preparation: Disconnect the negative battery terminal and wait 3 minutes for the SRS capacitor to discharge.
  • 2
    Fault confirmation: Connect the diagnostic tool to read DTCs, confirm B16F0-00 is a current fault (Active), and record freeze frame data.
  • 3
    Visual inspection: Remove the right C-pillar trim panel and rear bumper inner 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, and inspect the wiring harness for obvious damage.
  • 4
    Connector treatment: Clean the connector terminals, apply conductive grease, reconnect and ensure full lock engagement. Clear the fault code and road test to verify.
  • 5
    Sensor substitution test: Disconnect the faulty sensor and connect 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 <1 Ω), and verify there is no open circuit.
  • 7
    Insulation-to-ground check: Measure the resistance to body ground for 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 >1MΩ), and locate the short circuit.
  • 8
    Wiring harness repair: Wrap damaged areas with waterproof insulating tape, install corrugated conduit for protection, and adjust the wiring harness routing to avoid contact with sharp edges.
  • 9
    ECU inspection: If both 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 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 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.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.B110BDTC B110B indicates a fault in the internal air pump (sampling pump) of the PM2.5 air quality detector. This pump draws cabin or outside air into the PM2.5 sensor detection chamber, enabling the laser scattering sensor to measure real-time particulate matter concentration. The air conditioning controller (or BCM) sets this DTC upon detecting an open or short circuit in the pump drive circuit, or abnormal current caused by a seized pump motor. This fault disables the "Green Clean" system, causes the instrument cluster air quality display to read abnormally or disappear, and disables the automatic fresh air/recirculation switching function. It does not affect the vehicle powertrain or core thermal management functions.B173A1ADTC B173A1A indicates the right middle-row side airbag (typically located on the side of the right second-row seat or inside the C-pillar trim panel) igniter circuit resistance measures 0 Ω. In the Supplemental Restraint System (SRS), normal airbag igniter resistance ranges between 2.0 and 5.0 Ω. A resistance of 0 Ω indicates a short to ground or a short between circuit wires, preventing the Airbag Control Unit (ACU) from establishing a normal monitoring circuit. This safety-critical fault prevents the airbag from deploying during a collision, continuously illuminates the instrument panel SRS warning lamp, and may force the entire airbag system into fail-safe mode.B173BDTC B173B indicates an abnormal electric A/C compressor speed feedback signal or a communication fault between the compressor controller and the motor. In BYD new energy models (e.g., Tang, Song, Qin, and Yuan series), this DTC belongs to the HVAC subsystem within the Body Control system and specifically involves the electric compressor closed-loop control circuit. The ECU sets this DTC when the compressor controller (IPM) fails to receive a valid pulse signal from the Hall speed sensor for more than 3 continuous seconds, or when the deviation between the detected actual speed and the target commanded speed exceeds the calibrated threshold (typically >500 rpm). This fault forces the A/C system into fail-safe mode and stops compressor operation. Symptoms include a complete lack of cooling, intermittent cooling, or a sharp decrease in cooling performance. The instrument cluster A/C warning lamp may also illuminate. Prolonged operation with this fault can degrade high-voltage system insulation or cause controller overcurrent damage.
Common problems reported for Qin Plus →Qin Plus 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.