AU
C053C00

DTC C053C00 indicates the IPB (Intelligent Integrated Brake) system detects one or more wheel speed sensor input signals outside the plausible physical range — Seal U

Braking System

DTC C053C00 indicates the IPB (Intelligent Integrated Brake) system detects one or more wheel speed sensor input signals outside the plausible physical range.

Specific conditions include: the sensor reports an equivalent vehicle speed exceeding the theoretical maximum vehicle speed (e.g., a frequency corresponding to over 250 km/h); the signal frequency or amplitude exceeds the ECU calibration threshold; or the four-wheel speed logic mismatches (e.g., one wheel speed reads abnormally higher than the others).

This fault triggers the IPB safety protection mechanism, disables functions including ABS, ESC, and Automatic Emergency Braking, and forces the system into degraded mode.

3
Cases Logged
5
Causes
Likely Causes — Seal U
  • 1Wheel speed sensor component fault (internal coil open/short circuit, Hall element aging, magnetic material degradation)
  • 2ABS tone ring (target wheel) mechanical damage (missing or damaged teeth, foreign object jamming, deformation causing air gap variation)
  • 3Abnormal sensor installation gap (gap too large > 1.2 mm or too small < 0.3 mm, deformed bracket)
  • 4Wiring harness and connector faults (open circuit, short circuit, poor connection, water ingress and corrosion, electromagnetic interference)
  • 5IPB controller signal acquisition circuit fault (abnormal input impedance, ADC conversion error)
What To Do
  • 1
    Use the VDS diagnostic tool to read freeze frame data to confirm the specific wheel position of the fault (left front/right front/left rear/right rear) and the vehicle status at that time.
  • 2
    Raise the vehicle. Visually inspect the wheel speed sensor on the corresponding wheel and the integrity of the ABS tone ring (check for missing teeth, cracks, or attached metal debris).
  • 3
    Remove the sensor and measure the resistance (magnetic induction type is usually 1-1.5kΩ; for Hall type, measure the supply voltage). Inspect the sensor tip for metal debris.
  • 4
    Use a feeler gauge to measure the clearance between the sensor and the tone ring (standard: 0.3-1.0 mm; adjust or replace the bracket if deformed).
  • 5
    Check sensor wiring harness continuity and insulation. Measure IPB terminal voltage (12V supply, signal voltage 0.5-4.5V varying with rotational speed).
  • 6
    Road test the vehicle and use an oscilloscope to capture the signal waveform. Check for noise, signal interruption, or abnormal amplitude.
  • 7
    Perform the wheel speed sensor signal cross-validation test and compare the four-wheel speed data streams.
  • 8
    After replacing the faulty component, clear the fault code and perform IPB system calibration (if required).
Real-World Cases
BYD DTC AI Analysis

Abnormal air gap in Song PLUS DM-i left rear wheel speed sensor caused signal out of range.

✓
ABS and ESC warning lights illuminated intermittently during normal driving. Scanner retrieved code C053C00 (left rear wheel). Found the left rear wheel speed sensor mounting bracket deformed from bottoming out, opening the sensor-to-ABS tone ring gap to 2.1mm (out of specification). Reshaped the bracket and adjusted the gap to 0.6mm. Signal returned to normal.
BYD DTC AI Analysis

Tang DM ABS reluctor ring iron filing contamination causes false out-of-range signal

✓
Vehicle suddenly displayed a brake system fault while driving. Scanned DTC C053C00 (right front wheel). Removed and inspected the right front wheel; found the magnetic encoder ring (ABS tone ring) on the wheel hub bearing covered in brake dust and iron debris. This caused the Hall sensor to detect abnormal magnetic field strength and output a frequency signal outside the IPB processing range. Cleaned the tone ring and replaced the worn brake pads. Fault cleared.
BYD DTC AI Analysis

Han EV IPB wiring harness poor contact causing intermittent wheel speed out-of-range

✓
ESC warning triggers on rough roads; normal on flat roads. Freeze frame shows right rear wheel speed spiked above 300 km/h (actual speed 60 km/h). Inspection found loose connection at IPB control unit connector terminal A03 (right rear wheel speed signal). Contact resistance increased under vibration, causing abnormal signal amplitude. Re-crimped the terminal and applied conductive paste; fault resolved.
Other Seal U 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.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.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.
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.