AU
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 — Atto 3

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 Atto 3 indicates a medium-severity fault with the ESP lateral acceleration sensor or its power supply circuit. The sensor may be damaged or shorted, or the ESP/ABS control unit may not be providing a stable 5V reference supply. This can reduce ESP, ABS, and 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 — Atto 3
  • 1An internal circuit short or damage in the lateral acceleration sensor causes excessive operating current and pulls down the supply voltage.
  • 2ESP control unit (or ABS hydraulic modulator internal ECU) 5V reference voltage output circuit fault, failing to provide a stable sensor power supply.
  • 3Oxidation, looseness, or terminal back-out in 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 and short-circuited the wiring harness.
  • 5Low battery voltage or poor body ground causes low operating voltage for the entire ABS/ESP system.
What To Do
  • 1
    Use the diagnostic tool to read the DTC freeze frame and confirm parameters such as vehicle speed and voltage when the fault occurred. Check the 12V battery voltage and charging system for normal operation, and verify the static voltage is greater than 12.4V.
  • 2
    Check the power supply (terminal 30), ground (terminal 31), and ignition switch-controlled power (terminal 15) for the ESP control unit (usually located in the engine compartment or cabin). Verify the voltage is above 12V and the ground resistance is less than 1Ω.
  • 3
    Locate the lateral acceleration sensor (usually integrated into the ESP control unit or located under the chassis center tunnel). Inspect the wiring harness connector for looseness, water ingress, or oxidation. Measure the sensor supply voltage (specification: 5V±0.25V).
  • 4
    If the power supply is normal, use the diagnostic tool to perform the sensor calibration procedure. 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 ESP control unit assembly.
  • 5
    After replacing the part, clear the fault code, perform a sensor Zero Point Calibration, and road test the vehicle at different speeds (20km/h, 40km/h, 60km/h) to verify 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

✓
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 Atto 3 Fault Codes
P0AA6Hybrid Battery Voltage System Isolation FaultB1108For 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.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.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.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.
Common problems reported for Atto 3 →Atto 3 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.