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C050E00

DTC C050E00 indicates the IPB (Intelligent Integrated Braking System) or ABS module detects an abnormal short circuit to vehicle ground (GND) in the left rear wheel speed sensor (WSS) power supply circuit (typically the 12V supply line) — Qin Plus

Braking System

DTC C050E00 indicates the IPB (Intelligent Integrated Braking System) or ABS module detects an abnormal short circuit to vehicle ground (GND) in the left rear wheel speed sensor (WSS) power supply circuit (typically the 12V supply line).

This supply circuit provides the operating voltage for the Hall-effect or magnetic wheel speed sensor.

When a short to ground occurs, the power driver circuit inside the ABS module detects overcurrent or a voltage drop to nearly 0V, triggering the protection mechanism and storing the fault code.

This fault causes a missing or abnormal left rear wheel speed signal, forcing active safety functions such as ABS, ESC, TCS, and Automatic Emergency Braking (AEB) into fail-safe mode (conventional braking).

The instrument cluster illuminates multiple warning lamps, including ABS, ESC, and EBD.

This severely compromises driving safety and creates a risk of wheel lock-up, especially on slippery roads or during emergency braking.

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Cases Logged
Real-World Cases
BYD DTC AI Analysis

Seal 6 DM-i left rear wheel speed sensor harness chafed and shorted to ground

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While driving, the ABS and ESC warning lights suddenly lit up on the dash with a 'check brake system' alert. The scan tool pulled DTC C050E00 (left rear wheel speed sensor signal circuit short to ground). Inspection found the left rear wheel speed sensor wiring harness retaining clip had come loose where it passes through the body rail, allowing the harness to chafe against the rear suspension lower control arm. Prolonged friction damaged the insulation, exposing the copper core and shorting it to the metal bracket. Repair: Cut out the damaged section and soldered in a repair wire. Rerouted the harness and protected it with corrugated tubing and waterproof tape. Repositioned the retaining clip to prevent interference with moving parts. Replaced the wheel speed sensor, cleared the fault codes and road tested. Wheel speed signal returned to normal.
Original source ↗
BYD DTC AI Analysis

Song PLUS DM-i sensor connector corroded and shorted after water ingress

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After driving through flood water, the dashboard displayed a brake system fault and the ABS failed. Scanned DTCs C050E00 and C050C00 (wiring harness fault). Removed the left rear wheel speed sensor connector (located behind the left rear wheel arch liner) and found substantial muddy water deposits inside. Electrolytic corrosion between the power pin (normally red wire) and ground pin (black wire) had created green copper oxide, shorting the pins. Repair: Thoroughly cleaned the connector pins with electrical contact cleaner and sandpaper, replaced the waterproof seal, and applied silicone sealant at the connector mating surface to improve waterproofing. Measured sensor supply voltage at 12V (normal). Cleared the fault codes—fault resolved. Inspect the seals on other chassis wiring harness connectors.
Original source ↗
BYD DTC AI Analysis

Internal short circuit in wheel speed sensor body caused intermittent fault

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Cold starts are normal, but the ABS light comes on after roughly 10 minutes of driving. Shutting off and restarting the engine clears the fault, but it returns. Scanner shows DTC C050E00. Freeze frame data indicates the left rear wheel speed was 0 km/h when the fault triggered, while the other wheels read normally. Static resistance tests on the sensor were normal, but hot-state testing (using a heat gun to simulate operating temperature) showed a sharp resistance drop between power and ground. Diagnosis: thermal fatigue failure of the internal coil insulation. Repair: Replace the left rear wheel speed sensor (use the correct type—variable reluctance or Hall effect; Song PLUS DM-i usually has two-wire Hall or variable reluctance sensors). Adjust the sensor-to-tone ring gap to 0.3–1.2 mm during installation and apply grease to prevent seizing.
Original source ↗
BYD DTC AI Analysis

Internal drive circuit fault in IPB integrated brake module

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Repair case reference: After confirming the left rear wheel speed sensor, wiring harness, and connectors were normal, measured a continuous short to ground (resistance <1Ω) between the IPB (Integrated Power Brake) module’s left rear wheel speed sensor power supply terminal (typically marked RR+ or Vbat_RL) and ground. The short persisted at the module terminal even with the harness disconnected. Diagnosed as internal power management chip (LDO or MOSFET) breakdown in the IPB module. Fix: Replace the entire integrated brake unit (IPB is a complete assembly; part number varies by model—for example, the Song PLUS DM-i requires the IPB assembly). Post-replacement, perform IPB coding and configuration, longitudinal acceleration sensor calibration, brake line bleeding, and ESC function testing using a diagnostic tool. Fault resolved.
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.