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C001500

DTC C001500 indicates the IPB (Integrated Power Brake) ECU detects a circuit fault while actuating the right front wheel outlet valve (RF Outlet Valve, a Normally Closed Valve) — Atto 3

Braking System

DTC C001500 indicates the IPB (Integrated Power Brake) ECU detects a circuit fault while actuating the right front wheel outlet valve (RF Outlet Valve, a Normally Closed Valve).

This solenoid valve returns brake fluid from the right front wheel cylinder to the reservoir or master cylinder during the ABS/ESC pressure release phase, enabling precise brake force control.

Root causes include an open or short circuit in the solenoid coil, a damaged ECU on-board driver chip (MOSFET/ASIC), abnormal current feedback (e.g., mechanical valve sticking causing a current over-limit), or a wiring harness fault.

This fault prevents the right front wheel from achieving accurate pressure build-up, hold, and release cycles, and disables ABS/ESC functions.

In extreme cases, it causes right front wheel brake drag and uneven brake force distribution, severely compromising driving safety.

3
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD Song PLUS DM-i ABS/ESP warning, right front outlet valve driver circuit fault

✓
While driving, the ABS and ESC warning lights came on. Scanned DTC C001500 (Right Front Outlet Valve Drive Fault). Checked IPB wiring harness connections; normal. Measured internal solenoid resistance; open circuit. Confirmed open circuit in right front normally closed valve coil inside IPB assembly. Replaced IPB electro-hydraulic module assembly. Performed sensor calibration. System returned to normal.
Original source ↗
BYD DTC AI Analysis

Dashboard ABS warning light stays on. Diagnosis: right front outlet valve circuit fault.

✓
After starting the vehicle, the ABS warning light remained illuminated and the system failed its self-test. The scan tool retrieved DTC C0015 (right front outlet valve fault). Inspection revealed an internal circuit fault in the right front outlet valve within the ABS Hydraulic Control Unit (HCU); the solenoid valve would not actuate. The external wiring harness showed no damage, confirming an internal HCU failure. Replacing the ABS Hydraulic Control Unit assembly resolved the fault.
Original source ↗
BYD DTC AI Analysis

ESC warning light illuminated while driving; faulty normally closed valve in right front wheel caused abnormal braking.

✓
While driving, the ABS and ESC warning lights suddenly illuminated and the driver felt abnormal brake pedal travel. The scan tool displayed C0015-00 (right front normally closed valve fault). Testing revealed the right front outlet valve resistance fell outside the standard range (2-10 ohms) and the valve produced no operating sound during the actuator test. Confirmed an internal IPB solenoid valve fault. Replaced the IPB assembly, bled the brakes and calibrated the ESC. The fault codes cleared and the road test returned normal results.
Original source ↗
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.