AU
C006308

The yaw rate sensor (also known as the yaw angular velocity sensor) is the core inertial measurement unit of the ESP electronic stability system — Seal U

Braking System

The yaw rate sensor (also known as the yaw angular velocity sensor) is the core inertial measurement unit of the ESP electronic stability system.

It monitors the vehicle's rotational angular velocity around the vertical axis (Z-axis) in real time.

DTC C006308 indicates the ABS/ESP control unit detects the sensor's analog or digital output signal continuously exceeds the valid threshold range (typically 0-5V or an abnormal CAN signal), or experiences an abnormal update frequency or checksum error.

This fault prevents the ESP from accurately determining the deviation between the vehicle's actual attitude and the driver's steering intent, causing the system to exit the stability control function and trigger a multi-system degraded protection mode.

In extreme cases, the vehicle loses electronic assistance during emergency obstacle avoidance or sideslipping on wet or slippery roads, posing a severe safety hazard.

The C006308 fault code on the Seal U indicates a yaw rate sensor signal problem in the ABS/ESP system. Severity is medium, as stability control may be reduced or disabled, affecting safety during skids or emergency manoeuvres. Common causes include an internal fault or cold solder joint in the ESP hydraulic modulator assembly, or poor power/ground connections. The recommended fix is to visit an authorised dealer for diagnosis and repair. Typical repair cost data is available.
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Cases Logged
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Causes
Likely Causes — Seal U
  • 1Damaged yaw rate sensor chip integrated inside the ESP hydraulic modulator assembly, or cold solder joint (most common; many BYD models integrate the sensor into the ESP assembly instead of using a separate external unit)
  • 2Poor contact or intermittent connection in the sensor power supply circuit (12V IGN) or ground wire (GND), causing operating voltage fluctuations or momentary power loss.
  • 3Sensor signal line (LIN/CAN or analog signal line) shorted to power or ground, open circuit, or water ingress and oxidation in the connector causing signal crosstalk.
  • 4Loose sensor mounting base or aged and detached rubber vibration damper shifts the measurement reference, causing output signal drift to exceed the ECU fault tolerance range.
  • 5Physical damage to the sensor's internal MEMS micro-mechanical structure following an underbody impact, bottoming out, or severe jolting.
What To Do
  • 1
    Use the VDS2000/3000 diagnostic tool to read the complete fault codes and record freeze frame data. Confirm if C006308 is a current fault and check for accompanying related codes such as C006302/C006382.
  • 2
    Check the relevant warning light status on the instrument panel. Verify the data stream yaw rate value is near 0°/s (within ±5°/s) with the vehicle stationary. If the value remains fixed at 0 or 126, or is out of range, confirm the fault.
  • 3
    Raise the vehicle. Inspect the ESP assembly (located in the engine compartment or under the cabin center tunnel) exterior and the wiring harness connector (usually a large 25-47 pin plug) for water ingress, corrosion, or recessed pins.
  • 4
    Disconnect the battery negative terminal. Measure the voltage and resistance at the yaw rate sensor power supply pins (usually IGN+ and GND) in the ESP assembly connector. Standard values: Power supply 12V±0.5V, ground resistance <1Ω.
  • 5
    If the circuit is normal, attempt sensor zero-point calibration (supported on some models): with the vehicle stationary on a level surface, use the diagnostic tool to perform the "Yaw Rate Sensor Calibration" function.
  • 6
    If calibration fails or the fault persists, replace the ESP hydraulic modulator assembly with ECU (genuine BYD part). After replacement, perform bleeding, code matching, and sensor calibration.
  • 7
    Road test verification: Drive in an S-pattern at 20-40 km/h and observe whether the yaw rate value in the data stream changes in real time with steering input. Confirm the ESP function returns to normal and the fault code does not recur.
Real-World Cases
BYD DTC AI Analysis

BYD Song Plus DM-i: ESP and multiple warning lights on after water wading

✓
2021 Song PLUS DM-i. Owner reported that after driving through floodwater in heavy rain, the ABS, ESP and Automatic Emergency Braking warning lights illuminated. VDS scan showed current fault C006308. Found the ESP assembly near the right front side member. Disconnected the wiring harness connector and found water inside, with green corrosion on Pin 12 (sensor power supply) and Pin 28 (signal ground). Cleaned and dried the connector; fault cleared temporarily but returned after 2 days. Replaced the ESP wiring harness connector and sealed it against water. Fault resolved completely.
BYD DTC AI Analysis

Intermittent yaw rate sensor signal drift on E5 taxi

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A 2019 E5 taxi with 180,000 km occasionally displayed the ESC warning light, particularly after driving over speed bumps or rough roads. Scan tool showed intermittent fault code C006308. Live data revealed the yaw rate value occasionally jumped to 15-30°/s while the vehicle was stationary. Inspection of the ESP assembly mounting bracket found one mounting bolt loose and the rubber damper aged and cracked. Retightened the bolt and replaced the damper, then performed a continuous 50 km road test; live data remained stable and the fault resolved.
BYD DTC AI Analysis

C006308 fault code recurs after accident repairs

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A 2018 E5 sustained frontal collision damage. Repairs replaced the front bumper, left front fender and ESP assembly (salvage part). After the work, the instrument cluster showed a steady ESC fault. DTC C006308 was stored. The replacement ESP assembly part number had a different suffix from the factory original (missing the -02 version). The technical bulletin confirms this model requires a specific ESP version; sensor parameters require online programming and matching via VDS. Installing the correct ESP version and completing the online configuration cleared the fault.
BYD DTC AI Analysis

Sensor failed to initialize after long-term parking

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A 2019 E5 displayed an ESP warning light on startup after sitting stationary for 3 months. The scan tool retrieved DTC C006308; live data showed the yaw rate signal fixed at 0°/s. Power and ground circuits tested normal. The sensor calibration procedure returned "Calibration failed, sensor not ready". Diagnosis: internal ESP assembly sensor failure (long-term power-down caused the MEMS mechanism to seize). Replaced the ESP hydraulic modulator assembly, performed the calibration successfully, and cleared the fault.
Other Seal U Fault Codes
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.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.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.B173712DTC B173712 indicates a short to power in the firing circuit of the right second-row side airbag module in the Supplemental Restraint System (SRS). Specifically, the "right second-row side airbag" typically refers to the side impact airbag located in the right B-pillar or the side of the right seat. The "12" suffix indicates a circuit short to battery positive (B+). This fault causes the following conditions: 1) The airbag may fail to ignite and deploy during a collision, resulting in a loss of side impact protection. 2) In extreme cases, unintended triggering may cause accidental airbag deployment. 3) The SRS control unit detects abnormally high circuit voltage (typically above 4.5V) and enters fault protection mode. This may disable the entire airbag system and continuously illuminate the instrument cluster airbag warning light.
Common problems reported for Seal U →Seal U 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.