AU
C053B00

DTC C053B00 indicates an open circuit or abnormal voltage in the ABS solenoid valve power supply circuit inside the IPB (Intelligent Integrated Braking) module — Seal 6 EV

Braking System

DTC C053B00 indicates an open circuit or abnormal voltage in the ABS solenoid valve power supply circuit inside the IPB (Intelligent Integrated Braking) module.

This fault means the ECU detects the power supply line voltage to the ABS hydraulic modulator solenoid valve falls outside the normal range (typically below 9V or above 16V) or has an open circuit.

Because the IPB system integrates ABS, ESP, EHB (Electro-Hydraulic Braking), and other functions, an abnormal solenoid valve power supply causes safety functions such as anti-lock braking and vehicle stability control to fail or degrade.

The system then enters fail-safe mode.

External power supply circuit issues (fuses, wiring harnesses, connectors) or a fault in the IPB internal power management circuit can cause this fault.

Repair the system immediately to ensure braking system reliability.

The C053B00 fault code on the Seal 6 EV indicates an open circuit or abnormal voltage in the ABS solenoid valve power supply inside the IPB braking module. Severity is medium, as ABS and stability control may be reduced and the system can enter fail-safe mode. Common causes include a blown or loose IPB/ABS fuse, or corrosion/water ingress at the IPB power connector. Visit an authorised dealer promptly. Typical repair cost data is available.
5
Cases Logged
5
Causes
Likely Causes — Seal 6 EV
  • 1IPB/ABS system fuse in the front compartment power distribution box (usually 30A or 40A) is blown, loose, or making poor contact, causing power supply interruption or excessive voltage drop.
  • 2Pin oxidation, backed-out pins, ablation, or water ingress due to poor sealing at the IPB module power wiring harness connector (located in the front compartment near the firewall), causing increased contact resistance.
  • 3Poor contact, open circuit, or short circuit due to damaged insulation in the main power harness from the battery to the IPB module, especially harness aging caused by high temperatures in the motor compartment.
  • 4IPB hydraulic modulator assembly internal power supply circuit fault, such as a damaged DC-DC converter module, filter capacitor, or solenoid valve driver chip.
  • 5IPB module ground circuit (usually the body ground point) loose, oxidized, or corroded, causing increased circuit resistance and reference voltage drift.
What To Do
  • 1
    Use the VDS2000/VDS1000 diagnostic tool to read all fault codes. Check if C053C00 (wheel speed sensor) or other communication fault codes accompany C053B00. Record the freeze frame data.
  • 2
    Check the status of the ABS, ESP, and brake system warning lights on the instrument cluster. Perform a brake pedal feel test to confirm whether the IPB system has entered backup mode (hard pedal).
  • 3
    Measure the battery static voltage (≥12.4 V) and the voltage after start-up (13.5–14.5 V) to rule out a vehicle power supply system fault.
  • 4
    Check for blown IPB-related fuses, such as F1/17 and F1/18 (30A/40A), in the front compartment power distribution box. Measure the voltage drop at the fuse holder using a multimeter, and inspect the base for burning or blackening.
  • 5
    Disconnect the IPB module wiring harness connector (release pressure first to prevent brake fluid leakage). Inspect power supply pins, such as pin 1 (constant power +30) and pin 32 (IGN power +15), for oxidation, backed-out terminals, or burn damage. Measure the supply voltage; it must be 12V ± 0.5V.
  • 6
    Check the IPB module ground wire connection (typically ground point G101 or G102). Measure the ground resistance; it must be <1 Ω. Clean the ground point and apply conductive paste.
  • 7
    Inspect along the front compartment wiring harness for insulation damage on the ABS solenoid valve power supply circuit. Focus on the harness protective sleeve near the high-temperature engine area and the firewall pass-through.
  • 8
    If the external circuit tests normal (12V voltage, good ground, circuit continuity), the IPB hydraulic modulator assembly internal power supply circuit is faulty. Replace the IPB assembly (with ECU).
  • 9
    After replacing the IPB, perform the following: brake system bleeding procedure, yaw rate sensor calibration, steering angle sensor calibration, and longitudinal acceleration sensor calibration.
  • 10
    Clear the fault code and perform a road test (including an ABS activation test) to confirm the fault code does not recur and the braking system functions normally.
Real-World Cases
BYD DTC AI Analysis

Song PLUS DM-i: Poor fuse contact caused ABS valve power supply fault

✓
ABS and ESP warning lights illuminated intermittently while driving, and the brake pedal became stiff. Read DTC C053B00 using VDS2000. Inspected the front compartment fuse box and found the IPB fuse (40A) base burnt and blackened. Poor contact between the fuse and base caused excessive voltage drop (measured at only 8.5V). Replaced the fuse box base and fuse, cleaned the IPB power connector pins, applied conductive grease. Fault resolved.
Original source ↗
BYD DTC AI Analysis

Qin Pro DM multi-system faults with abnormal ABS valve power supply

✓
Dashboard showed multiple warnings: "Check Engine System", "ABS System", and "Network". Braking felt abnormal. Diagnosis revealed communication faults between the ECM, ESP, and other modules, with DTC C053B00. Inspection found the ESP fuse loose in the front compartment fuse box, causing intermittent power interruption to the IPB module. Secured the fuse and checked the ESP module harness connector; found slight oxidation on the IGN power pin. Cleaned the terminal and recalibrated the sensors. Fault cleared.
Original source ↗
BYD DTC AI Analysis

Water ingress and corrosion caused IPB supply voltage fault in Song MAX

✓
Intermittent no-start condition. With the brake pedal depressed and start button pressed, the vehicle fails to start and the dashboard displays a brake system fault. DTC C053B00 stored. Found low supply voltage to the ESP module (10.2V). Traced the wiring harness and found the connector seal between the front compartment harness and IPB valve body had degraded, allowing water ingress and pin corrosion. Cleaned and dried the connector, replaced the corroded pins and seal, and resealed the wiring harness. Fault resolved.
Original source ↗
BYD DTC AI Analysis

Han EV: IPB Internal Power Module Failure and Replacement Case

✓
The dashboard constantly displayed "Brake System Fault" with the ABS and ESC lights on. The scan tool retrieved code C053B00 but could not clear it. The technician measured normal supply voltage at the IPB module (12.3V), confirmed good ground, and verified wiring harness continuity. They diagnosed an internal power management circuit failure in the IPB hydraulic modulator assembly. After replacing the IPB assembly with ECU, they performed brake system bleeding and sensor calibration. The fault code cleared and ABS function returned to normal.
BYD DTC AI Analysis

Tang DM wiring harness wear caused intermittent open circuit in ABS valve power supply

✓
ABS warning light illuminates intermittently on rough roads; normal on flat surfaces. DTC C053B00 (intermittent) stored. Found the power supply harness between the engine bay and IPB chafed at the firewall penetration—prolonged vibration wore through the insulation, causing an intermittent short to ground. Repaired the damaged section, fitted an abrasion-resistant protective sleeve, and re-secured the routing to prevent contact with the body. Fault resolved.
Other Seal 6 EV 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.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.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.B1737DTC B1737 indicates the Supplemental Restraint System (SRS) detected abnormal continuity between the right middle-row side airbag squib circuit (typically the second-row right seat side airbag or right curtain airbag) and the vehicle power supply (B+, battery positive). The SRS ECU monitors the airbag inflator resistance via an internal current source (normal resistance: 2.0–3.0 Ω). If the ECU detects the voltage across the inflator circuit remaining close to battery voltage (>5 V and approaching 12 V) instead of the expected low potential or floating state, it identifies a short to power. This fault prevents the airbag from deploying normally during a collision because the short circuit bypasses the firing current. In extreme cases, abnormal current can cause unintended deployment, posing a severe safety hazard.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 Seal 6 EV →Seal 6 EV 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.