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C080001

For BYD new energy vehicles (specifically E5, Qin, Tang, and Song models equipped with Bosch or Continental ESP systems), DTC C080001 indicates a fault in the ESP (Electronic Stability Program) lateral acceleration sensor or its power supply circuit — Qin Plus

Braking System

For BYD new energy vehicles (specifically E5, Qin, Tang, and Song models equipped with Bosch or Continental ESP systems), DTC C080001 indicates a fault in the ESP (Electronic Stability Program) lateral acceleration sensor or its power supply circuit.

Although the fault description reads "voltage below range", this specifically means the lateral acceleration sensor supply voltage falls below the ECU threshold (normal range: 4.5V–5.5V), or the sensor output signal voltage remains below the valid range (0.5V–4.5V).

Consequently, the ECU cannot obtain accurate vehicle lateral acceleration data.

This condition causes active safety functions (ESP, ABS, EBD) to fail or enter a degraded mode, severely compromising vehicle stability during cornering or driving on wet and slippery surfaces.

The C080001 fault code on the Qin Plus indicates a medium-severity problem with the ESP lateral acceleration sensor or its power supply circuit. The sensor may be internally shorted or damaged, pulling down the 5V supply, or the ESP/ABS control unit may not be providing stable sensor power. This can reduce ESP, ABS, or EBD performance. 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 — Qin Plus
  • 1Internal short circuit or damage in the lateral acceleration sensor causes excessive operating current and pulls down the supply voltage.
  • 2Fault in the 5V reference voltage output circuit of the ESP control unit (or internal ECU of the ABS hydraulic modulator), failing to provide stable sensor power.
  • 3Oxidation, a loose connection, or terminal back-out at the sensor wiring harness connector causes excessive contact resistance, reducing actual voltage at the sensor.
  • 4Chassis impact or bottoming out shifted the sensor mounting position, or damaged or short-circuited the wiring harness.
  • 5Low battery voltage or poor body ground causes low operating voltage across the entire ABS/ESP system.
What To Do
  • 1
    Use the diagnostic tool to read the DTC freeze frame and confirm vehicle speed, voltage, and other parameters when the fault occurred. Check the battery voltage and charging system. Verify the static voltage is greater than 12.4V.
  • 2
    Check the power supply (terminal 30), ground (terminal 31), and ignition switch-controlled power supply (terminal 15) of the ESP control unit (usually located in the engine compartment or cabin). Ensure the voltage is above 12V and the ground resistance is less than 1Ω.
  • 3
    Locate the lateral acceleration sensor (usually integrated inside the ESP control unit or located beneath the chassis center tunnel). Inspect the wiring harness connector for looseness, water ingress, or oxidation. Measure the sensor supply voltage (should be 5V±0.25V).
  • 4
    If the power supply is normal, perform the sensor calibration procedure using the diagnostic tool. If calibration fails or the data stream shows abnormal acceleration values (should be close to 0m/s² when stationary, range ±0.1m/s²), replace the lateral acceleration sensor or the ESP control unit assembly.
  • 5
    After replacing the component, clear the fault code, perform a sensor Zero Point Calibration, and conduct a road test at various speeds (20 km/h, 40 km/h, 60 km/h) to confirm normal ESP operation and no fault code recurrence.
Real-World Cases
BYD DTC AI Analysis

BYD Qin 2015 — Workshop Manual Standard Diagnostic Procedure

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ESP warning light stays on, DTC C080001. Scan tool live data shows lateral acceleration sensor signal voltage at 0.2V (normal: approx. 2.5V at standstill). Further inspection revealed an internal 5V voltage regulator circuit failure in the ESP control unit. The faulty regulator could not provide stable power to the sensor, causing supply voltage to drop to only 3.2V (below the 4.5V threshold). Replaced the ESP hydraulic modulator assembly (integrated ECU and sensor), performed sensor calibration and yaw rate sensor calibration using the scan tool, cleared the fault codes, and road tested with normal results.
Original source ↗
BYD DTC AI Analysis

BYD Tang DM 2018 — Underbody scrape caused wiring harness fault

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ESP warning light illuminated after driving on rough roads, logging intermittent DTC C080001. Raised the vehicle and found stone damage to the lateral acceleration sensor wiring harness (located near the chassis crossmember). The damaged insulation caused intermittent short-to-ground between the internal conductor and body, pulling down the sensor supply voltage. Measured voltage between pin 1 (supply) and pin 3 (ground) at the sensor connector using a multimeter; voltage dropped from 5V to 2V when the vehicle shook. Repaired the wiring (replaced 30cm harness section), rewrapped with waterproof tape, and secured the harness routing. Fault resolved.
BYD DTC AI Analysis

BYD E5 2019 – Oxidised connector, poor contact

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Vehicle developed an ESP fault after wading through water. Scan tool showed active code C080001. Disconnected the lateral acceleration sensor connector under the cabin floor and found severely oxidized pins with green corrosion. Contact resistance measured 8Ω (normal <1Ω). Sensor supply voltage was only 3.8V. Cleaned the male and female terminals with electronic contact cleaner, applied dielectric grease to prevent further oxidation, and reconnected. Supply voltage returned to 5.02V. Cleared the fault codes; system normal.
BYD DTC AI Analysis

2017 BYD Song – False warning after tyre replacement

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After tyre replacement at an independent workshop, the dashboard threw an ESP fault. The scan showed C080001 and C080002 (longitudinal acceleration sensor). Inspection found the lift points had crushed the sensor harness at the centre of the chassis when technicians jacked up the car, damaging the wires inside without fully severing them. The sensor supply line measured 5 V static, but dropped to zero when cornering—chassis flex stretched the harness and opened the circuit. Replaced the damaged harness section and rerouted it clear of the lift points.
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.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.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.B173A1ADTC B173A1A indicates the right middle-row side airbag (typically located on the side of the right second-row seat or inside the C-pillar trim panel) igniter circuit resistance measures 0 Ω. In the Supplemental Restraint System (SRS), normal airbag igniter resistance ranges between 2.0 and 5.0 Ω. A resistance of 0 Ω indicates a short to ground or a short between circuit wires, preventing the Airbag Control Unit (ACU) from establishing a normal monitoring circuit. This safety-critical fault prevents the airbag from deploying during a collision, continuously illuminates the instrument panel SRS warning lamp, and may force the entire airbag system into fail-safe mode.B173BDTC B173B indicates an abnormal electric A/C compressor speed feedback signal or a communication fault between the compressor controller and the motor. In BYD new energy models (e.g., Tang, Song, Qin, and Yuan series), this DTC belongs to the HVAC subsystem within the Body Control system and specifically involves the electric compressor closed-loop control circuit. The ECU sets this DTC when the compressor controller (IPM) fails to receive a valid pulse signal from the Hall speed sensor for more than 3 continuous seconds, or when the deviation between the detected actual speed and the target commanded speed exceeds the calibrated threshold (typically >500 rpm). This fault forces the A/C system into fail-safe mode and stops compressor operation. Symptoms include a complete lack of cooling, intermittent cooling, or a sharp decrease in cooling performance. The instrument cluster A/C warning lamp may also illuminate. Prolonged operation with this fault can degrade high-voltage system insulation or cause controller overcurrent damage.
Common problems reported for Qin Plus →Qin Plus 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.