AU
C006164

DTC C006164 indicates the IPB (Integrated Intelligent Braking System) detected an abnormal Lateral Acceleration Sensor (LAS) signal or a sensor fault — Seal U

Braking System

DTC C006164 indicates the IPB (Integrated Intelligent Braking System) detected an abnormal Lateral Acceleration Sensor (LAS) signal or a sensor fault.

The LAS is a core sensor in the ESP/ESC vehicle stability control system.

It monitors vehicle lateral acceleration (centrifugal acceleration) in real time, helping the ECU detect unstable conditions such as side slip, fishtailing, or understeer.

This fault degrades or completely disables the ESC, ABS, TCS (Traction Control System), and Automatic Emergency Braking (AEB) functions.

The vehicle enters Limp Mode, and the instrument cluster simultaneously illuminates the ABS and ESC warning lights.

BYD’s new-generation IPB system typically integrates the lateral acceleration sensor into the Inertial Measurement Unit (IMU) inside the IPB assembly, rather than using a separate external sensor.

Therefore, this fault usually indicates an internal hardware or communication link issue within the IPB assembly.

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Cases Logged
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Causes
Likely Causes — Seal U
  • 1Hardware damage or signal drift of the internal lateral acceleration sensor (MEMS chip) in the IPB assembly, usually resulting from long-term vibration, thermal cycling aging, or inherent chip defects.
  • 2Abnormal IPB assembly power supply or ground circuit (unstable voltage or poor ground), causing the sensor supply voltage to drop below 9V or exceed 16V, outside the normal operating range.
  • 3CAN bus communication fault, including short or open circuits in the CAN-H and CAN-L lines, or abnormal terminating resistance, interrupting communication between the IPB and VCU/ESP ECU.
  • 4An offset IPB assembly installation angle or loose retaining bolts misalign the sensor zero reference, causing it to exceed the ±1.5° calibration tolerance range during self-check.
  • 5Corrosion of the internal IPB assembly circuit board, cracked solder joints, or physical impact damage to the sensor following a severe vehicle collision or water ingress.
What To Do
  • 1
    Use the VDS2000/VDS3 diagnostic tool to read all fault codes. Check for related faults such as C006108 (signal plausibility fault) and U100304 (CAN communication fault), and record the lateral acceleration value from the freeze frame data.
  • 2
    Visually inspect the IPB assembly installation condition. Confirm the fastening torque is 8±2N·m and the installation angle deviation is within ±2°. Check the wiring harness connector (32-pin plug) for backed-out pins, water ingress, or burn marks.
  • 3
    Measure the IPB assembly supply voltage: Use a multimeter to measure the voltage between Pin 1 (constant power +B) and Pin 16 (GND). With the key in the ON position, the voltage should be 12 ± 0.5 V. Measure the CAN-H (Pin 6) and CAN-L (Pin 14) waveforms. The standard dominant level is CAN-H 3.5 V / CAN-L 1.5 V, and the recessive level is 2.5 V for both.
  • 4
    Perform the lateral acceleration sensor calibration procedure: Use the diagnostic tool to enter IPB system → Special Functions → Sensor Calibration. Keep the vehicle stationary on a level surface and center the steering wheel. Follow the prompts to complete the X-axis (longitudinal) and Y-axis (lateral) zero-point calibration. The calibration value should display as 0 ± 0.1 m/s².
  • 5
    If calibration fails or the fault code remains, replace the IPB assembly (part number depends on vehicle model: 5A-3555010C for Song PLUS DM-i). After replacement, recalibrate and perform the brake line bleeding procedure (use the diagnostic tool to activate the pump for bleeding, as the IPB integrates an electronic vacuum pump).
  • 6
    Perform a road test: Drive at 20-40 km/h and execute S-shaped lane changes or navigate a roundabout. Monitor the data stream to verify the lateral acceleration signal changes in real time with the steering angle (normal range ±1.5g). Confirm the ESC function is restored and the fault light is off.
Real-World Cases
BYD DTC AI Analysis

Intermittent lateral acceleration sensor failure on Song PLUS DM-i after wading through water

✓
Drove through approximately 40cm of water; dashboard then lit ABS/ESC warnings intermittently. Scanner pulled historical code C006164. Found the IPB mounted low inside the left front wheel arch. Disassembly revealed the wiring harness connector seal had degraded—trace moisture dropped insulation resistance between Pin 3 (sensor supply) and Pin 4 (signal ground) to 200kΩ (normal >10MΩ). Cleaned the connector, replaced the seal and blew dry the circuits. Fault cleared. Advised owner to avoid deep water or fit an IPB waterproof shield.
BYD DTC AI Analysis

Continuous C006164 warning on Song Pro EV after IPB replacement without calibration

✓
After the IPB assembly was replaced during accident repairs, the scan tool displayed active fault code C006164 and the ESC function failed. Inspection revealed the technician had only bled the brake fluid without calibrating the sensors. Using VDS3, we ran the 'Inertial Sensor Calibration' routine, keeping the vehicle level and stationary for 5 minutes. The fault code cleared automatically upon successful calibration. Note: After BYD IPB replacement, three-stage calibration is mandatory: longitudinal acceleration sensor, lateral acceleration sensor, and yaw rate sensor. All three steps are required.
BYD DTC AI Analysis

Han EV: Sensor signal spiked on bumpy road, triggering C006164

✓
Driver reported intermittent ESC warning light on uneven roads. Retrieved fault code C006164 (intermittent). Freeze frame showed lateral acceleration spiked to 15 m/s² (physically impossible). Lifted vehicle and found IPB assembly mounting bracket deformed, creating 0.5 mm gap between IPB and body that caused micro-vibrations while driving. Replaced IPB mounting bracket and retightened to specified torque of 8 N·m. Fault cleared. Previous underbody contact caused hidden deformation of the bracket.
BYD DTC AI Analysis

Tang DM-p IPB internal sensor chip thermal drift fault

✓
High summer temperatures (ambient temperature 42°C) frequently triggered DTC C006164; the fault cleared when cold. When hot, the IPB internal temperature sensor read 85°C and the lateral acceleration signal drifted to 0.8 m/s² (normal: 0±0.3). Diagnosed as excessive thermal drift in the IPB internal MEMS sensor. Replaced the IPB assembly and upgraded the software to V2.4 (optimized high-temperature compensation algorithm). Fault cleared. This case represents a batch-related potential defect; BYD previously issued a technical bulletin requiring IPB software upgrades.
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.