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C024501

DTC C024501 indicates a general Wheel Speed Sensor Fault in the BYD ABS/ESP system — Atto 3

Braking System

DTC C024501 indicates a general Wheel Speed Sensor Fault in the BYD ABS/ESP system.

The ABS control unit (ECU) sets this code when it detects an abnormal or completely lost wheel speed signal from at least one wheel while the vehicle is moving.

Specifically, the ECU triggers this DTC if the vehicle speed exceeds 2 km/h and the ECU fails to receive a pulse signal from a wheel speed sensor, or if the speed difference between the affected wheel and the opposite wheel on the same axle (or the reference vehicle speed) exceeds the set threshold (typically 6%) for longer than the specified time (typically 500 ms).

This fault forces the Anti-lock Braking System (ABS), Electronic Brakeforce Distribution (EBD), Electronic Stability Program (ESP), Traction Control System (TCS), Auto Hold, and energy recovery systems into a degraded or inoperative mode.

This severely compromises braking safety and driving stability.

This DTC represents a circuit or signal fault and does not involve a mechanical actuator.

However, mechanical or electrical issues with the sensor body, wiring harness, connector, or signal tone ring can cause the fault.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Qin left rear wheel speed sensor open circuit fault

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Symptoms: ABS warning light on constantly, dashboard displays 'Check ABS System', ESP function restricted. Diagnosis: VDS retrieved fault code C024501, data stream shows left rear wheel speed at 0km/h. Found left rear wheel speed sensor connector loose with oxidised pins; measured sensor resistance as infinite (internal open circuit). Solution: Replaced left rear wheel speed sensor, cleaned connector oxidation, cleared fault codes and road tested. ABS function returned to normal.
Original source ↗
BYD DTC AI Analysis

BYD Song wheel speed sensor wiring harness chafed and shorted

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Symptoms: While driving, the instrument cluster suddenly displayed multiple system warnings: 'Check engine system', 'ABS system', 'network', and 'braking system'. The ABS and brake warning lights lit up simultaneously. Diagnosis: VDS scan retrieved DTCs C024501 and C003708 (left rear wheel speed sensor signal fault). Inspection found the left rear wheel speed sensor harness had chafed through against the chassis, shorting the signal wire to ground. The left rear tone ring also had slight deformation. Resolution: Repaired the damaged harness and added protection. Replaced the left rear wheel bearing assembly (including tone ring). Recalibrated the ABS system. Fault resolved.
Original source ↗
BYD DTC AI Analysis

BYD F3 right front wheel speed sensor air gap out of specification

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Symptoms: ABS warning light illuminates when vehicle speed exceeds 30 km/h; fault occurs more frequently on rough roads. Diagnosis: Retrieved DTC C024501 series. Monitored live data and found intermittent signal dropouts from the right front wheel speed sensor. Inspection revealed heavy metallic debris on the sensor head and loose mounting bolts, causing an air gap exceeding 1.5 mm (specification: 0.3–1.2 mm). Repair: Cleaned the sensor head and tone ring. Repositioned the sensor to achieve the specified air gap. Torqued the mounting bolts to 10 N·m. Cleared the DTCs and verified normal operation during a 60 km/h road test.
BYD DTC AI Analysis

BYD Surui ESP Limited Function Fault

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Symptoms: Dashboard displayed 'ESP function limited', vehicle unstable during cornering, traction control ineffective in rain and snow. Diagnosis: VDS scan retrieved DTC C024501 and related codes. Right rear wheel speed sensor signal voltage measured below 0.5V (abnormal). Traced wiring and found right rear sensor harness chafed through against body sheet metal, signal wire shorted to ground with internal sensor damage. Resolution: Repaired damaged harness and rerouted with corrugated tubing, replaced right rear wheel speed sensor. Dynamic test confirmed ESP function restored.
Original source ↗
BYD DTC AI Analysis

BYD E5: Intermittent wheel speed sensor signal loss

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Symptoms: ABS warning light on intermittently, occasionally going out after driving some distance. Normal at low urban speeds; light occasionally comes on at highway speeds. Diagnosis: Scan tool showed history DTC C024501. Live data revealed right front wheel speed signal intermittently dropped to zero. Inspection found sensor connector pins slightly expanded causing poor contact, plus minor harness chafing near the steering knuckle. Solution: Repaired harness chafing, adjusted connector pin tension for reliable contact, and applied waterproof sealant. Fault resolved.
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For 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.
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.