AU
C006382

BYD's IPB (Integrated Brake Control System) defines DTC C006382 as a lateral acceleration sensor (G200) signal plausibility fault, rather than a simple yaw rate sensor fault — Seal U

Braking System

BYD's IPB (Integrated Brake Control System) defines DTC C006382 as a lateral acceleration sensor (G200) signal plausibility fault, rather than a simple yaw rate sensor fault.

This sensor typically mounts beneath the center console or behind the center armrest.

It continuously monitors lateral acceleration (in m/s² or G) during cornering or skidding, serving as a core input signal for the ESC (Electronic Stability Control) system to determine the vehicle's dynamic attitude.

The IPB control unit deems the signal unreliable and triggers this DTC if the sensor output falls outside the plausible range (does not approach 0 when stationary), exhibits excessive drift, or if the sensor mounting reference plane deviates from the vehicle horizontal plane by more than 3°.

Following this fault, active safety functions including ESC, ABS, and Automatic Emergency Braking (AEB) may degrade or fail completely.

In extreme cases, the vehicle may lose stability control on curves or slippery surfaces, posing a severe safety risk.

4
Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Sensor mounting position offset or loose mechanical mounting: Failure to tighten the screws to the standard torque (usually 8 Nm) after accident repairs or removing the center console or armrest box causes the sensor body to tilt or prevents the arrow mark from pointing directly to the front of the vehicle.
  • 2Wiring harness connector water ingress and oxidation: After driving through water (especially standing water exceeding 20cm), poor sealing of the sensor plug near the floor causes terminal oxidation, short circuits, or increased contact resistance.
  • 3Control unit calibration data lost: Replacing the low-voltage battery (auxiliary battery), disconnecting power for over 30 minutes, or updating the software clears the sensor zero-point calibration data stored in the IPB control unit, causing a signal reference error.
  • 4Internal damage to the sensor body: Internal MEMS chip aging after long-term use, or severe vehicle impacts (such as bottoming out or driving at high speeds on rough roads) causing physical damage to the sensor (relatively rare).
  • 5Mounting bracket deformation: Prying the center console or floor frame during front-end collision repairs inadvertently deforms the sensor mounting bracket, making the sensor mounting surface non-parallel to the vehicle's horizontal reference plane.
What To Do
  • 1
    Initial visual inspection: Remove the centre armrest box or the trim panel below the centre console. Check the lateral acceleration sensor for physical damage, the mounting bracket for deformation, the connector for water marks or green oxidation, and the fixing screws for looseness.
  • 2
    Diagnostic scan tool data stream analysis: Use the BYD VDS2000 or Launch X431 to read the DTC freeze frame and check the 'lateral acceleration' value in the data stream. With the vehicle stationary on a level surface, the normal value should be close to 0±0.2 m/s². If the value shows a fixed offset (e.g., 0.8 m/s²) or fluctuates erratically, this confirms an abnormal sensor signal.
  • 3
    Electrical circuit inspection: Disconnect the sensor connector. Measure the power supply pin voltage (should be 12V±0.5V), ground wire resistance (should be less than 1Ω), and CAN-H (2.6V±0.2V) and CAN-L (2.4V±0.2V) voltage to ground. Check the connector pins for oxidation. If necessary, clean with electronic contact cleaner and apply conductive grease.
  • 4
    Mechanical installation calibration: Use a spirit level or dedicated calibration tool to check the sensor installation angle. Ensure the sensor arrow mark points directly to the front of the vehicle and the parallelism error between the mounting surface and the vehicle horizontal plane is less than 3°. Retighten the fixing screws to the specified torque (usually 8Nm).
  • 5
    Sensor zero-point calibration: Park the vehicle on level ground, center the steering wheel, and use the dedicated diagnostic tool to enter 'Chassis System' → 'Electronic Stability Program' → 'Special Functions'. Perform 'Lateral Acceleration Sensor Zero-Point Calibration' and 'ESC System Calibration' in sequence. On some models, also perform 'Longitudinal Acceleration Sensor Calibration' and 'Steering Angle Sensor Calibration'.
  • 6
    Function verification and road test: Clear the fault code, start the vehicle, and verify the ESC/ABS warning light on the instrument cluster turns off. Perform a road test including straight-line driving, lane changes, and cornering. Monitor the data stream to confirm the lateral acceleration value changes in real time and responds logically to steering input, with no abnormal spikes.
Real-World Cases
BYD DTC AI Analysis

Loose sensor mounting screw caused signal offset on Qin Pro DM

✓
Symptoms: Dashboard displayed "Check ESP System" and "Check ABS System". ESP warning light stayed on. ESP intermittently intervened abnormally during cornering (sudden single-wheel braking). Diagnosis: Fault code C006382. Live data showed lateral acceleration sensor reading 0.8 m/s² at standstill (normally near 0), with no change during steering. Found loose mounting screws at the rear of the centre console; sensor body tilted ~5°. Resolution: Tightened screws to 8 Nm, performed sensor zero calibration and ESC system calibration. Fault cleared.
BYD DTC AI Analysis

Song MAX connector oxidized after water ingress during wading

✓
Symptoms: Vehicle waded through ~20 cm of water. On startup, ESP light stayed on, steering was heavy (EPS entered protection mode), and speed was restricted. Diagnosis: Fault codes C006382 and C003708 present. Removed centre console and inspected sensor connector; found water inside with pins 1 and 4 oxidised green. Signal line-to-ground resistance measured abnormal. Resolution: Cleaned connector pins with electronic cleaner, blow-dried them, and applied waterproof conductive grease. Reconnected plug and performed sensor calibration. Recommended installing a waterproof cover.
BYD DTC AI Analysis

Tang DM installation angle error after accident repair

✓
Symptoms: After front impact repairs (front bumper and radiator support replaced), the ESP warning light remained on. Previous repairs did not involve the chassis. Diagnosis: Read DTC C006382. Found centre console removal during the accident repair had pried the sensor mounting bracket, leaving the sensor mounting surface at approximately 5° from the vehicle horizontal plane (standard requires <3°). Data stream showed lateral acceleration values fluctuating between +0.5G and -0.3G at standstill. Resolution: Corrected the sensor mounting bracket, ensured the arrow marking pointed directly forward and the sensor was level, then calibrated the lateral acceleration and steering angle sensors.
BYD DTC AI Analysis

Calibration data lost after 12V battery replacement on BYD Han EV

✓
Symptom: After the dealership replaced the auxiliary battery and upgraded the infotainment system, the instrument cluster displayed "Electronic Stability System Fault" with DTC C006382 at startup. Diagnosis: Only DTC C006382 present; no hardware fault codes. Sensor power and ground checked normal. Live data showed "invalid data". The battery replacement involved an extended power disconnect (over 30 minutes), causing ESP control unit calibration data loss. Resolution: No parts required. Parked the vehicle on level ground with the steering wheel straight. Used the BYD VDS diagnostic tool to perform "lateral acceleration sensor zero-point calibration" and "longitudinal acceleration sensor calibration". Cycled the ignition after calibration completed; the warning light cleared.
Other Seal U 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: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.