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B176112

DTC B176112 indicates a short to power in the left front wiper motor control circuit (although some documents incorrectly label this as an airbag fault, the BYD DTC system designates B17 for the wiper system) — Qin Plus

Safety System

DTC B176112 indicates a short to power in the left front wiper motor control circuit (although some documents incorrectly label this as an airbag fault, the BYD DTC system designates B17 for the wiper system).

This occurs when the Body Control Module (BCM) detects an abnormally low-resistance connection between the left front wiper motor power or control line and battery positive (B+), causing an abnormal increase in circuit current.

Symptoms include unintended wiper operation, inability to turn off the wipers, continuous high-speed operation, or complete failure.

Severe cases risk wiring harness overheating, blown fuses, or electrical fire.

Damaged wiring insulation, internal motor winding breakdown, or sticking relay contacts typically cause this short to power.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Song MAX: LH front wiper wiring harness chafed, causing short circuit

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Driving in rain, the wipers suddenly stopped working and the instrument cluster displayed a wiper system fault. VDS read DTC B176112. The fuse was not blown, but removing the left front A-pillar trim revealed the wiper motor harness had chafed through at the firewall penetration. Long-term friction against the metal edge had worn through the insulation, causing the power wire to short to body. Repaired the damaged section with insulating tape, fitted corrugated tubing for protection, and rerouted the harness to avoid contact with sharp edges. Fault eliminated.
Original source ↗
BYD DTC AI Analysis

BYD Qin Pro windscreen wiper motor intermittent failure

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Wipers occasionally failed in automatic mode but worked normally in manual mode. The scan tool showed codes but no warning light illuminated on the instrument cluster. BCM stored DTC B176112 for abnormal motor position feedback signal. Found slight oxidation on the wiper motor connector pins increasing contact resistance, and worn internal carbon brushes producing metal debris that caused an intermittent short circuit. Replaced the front wiper motor assembly, cleaned the BCM connector and applied conductive grease. Cleared the fault codes; the issue has not reoccurred.
Original source ↗
BYD DTC AI Analysis

BYD Tang DM wiper relay contacts stuck, causing continuous operation

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After starting the vehicle, the wipers ran automatically and could not be turned off, continuing to run for several seconds after switching off the ignition. The scan tool pulled DTC B176112 (Wiper Motor Control Circuit Short to Power). Inspection found the wiper motor relay contacts had welded in the front compartment power distribution box, keeping the motor powered continuously. The wiring insulation between the BCM and relay control line had also chafed through against a nearby power harness, shorting to power. Replaced the wiper relay, repaired the damaged harness, and updated the BCM software (fixing a control logic bug in early models). Fault completely resolved.
Original source ↗
BYD DTC AI Analysis

BYD E2 wiper motor internal short circuit

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Owner stated the fuse blows immediately upon activating the wipers. The fault persisted after fuse replacement. Scanned fault code B176112. Disconnected the left front wiper motor connector and measured resistance across the terminals. Continuity between the high-speed terminal and housing measured 0.5Ω, indicating internal armature winding insulation breakdown with a short to power. Replaced the left front wiper motor assembly. Checked the related wiring harness and found no damage. Replaced the 30A fuse and verified the repair. All wiper speed functions tested normal.
BYD DTC AI Analysis

BYD Qin EV wiper connector shorted due to water ingress

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After the vehicle waded through water, the wipers would not shut off. The scanner showed DTC B176112. The left front wiper motor sits low in the engine bay. Its connector seal had deteriorated, letting water in during the wading. This created an electrolyte conductive path between the power and high-speed pins inside the connector, causing a short to power. Drained the water and cleaned corrosion from the connector, cleaned the pins with electronic cleaner, applied waterproof silicone grease, and replaced the waterproof seal. Fault resolved. Advised the owner to avoid deep water.
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.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.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.B110AThis DTC indicates interrupted CAN bus communication or abnormal data between the air conditioning control unit (ACU) and the PM2.5 air quality sensor. The PM2.5 sensor monitors particulate concentration inside and outside the vehicle and provides the basis for purification control in the automatic air conditioning system. The ACU triggers this fault if it fails to receive a valid CAN message from the sensor within the specified period (usually 100-500 ms), if message verification fails, or if the signal frame times out. Although this fault does not affect vehicle driving safety, it disables the automatic air purification function. The air conditioning system cannot automatically switch between recirculation and fresh air modes or activate the air purification mode based on air quality. A persistent fault may restrict the thermal management strategy.
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.