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C053F00

DTC C053F00 indicates an electrical circuit fault in Primary Pressure Sensor 1 within the IPB (Intelligent Integrated Braking System, One-Box brake-by-wire unit) — Seal 6 EV

Braking System

DTC C053F00 indicates an electrical circuit fault in Primary Pressure Sensor 1 within the IPB (Intelligent Integrated Braking System, One-Box brake-by-wire unit).

Specifically, the signal circuit, 5V supply circuit, or ground circuit has a short to ground, short to power, or open circuit.

This sensor is a core input component of the brake-by-wire system.

It monitors brake master cylinder hydraulic pressure or pedal simulator pressure in real time, providing critical data for brake assist, energy recovery, ESC vehicle stability, and AEB automatic emergency braking.

When this fault occurs, the IPB immediately enters limp-home mode, potentially causing a loss of brake assist, a hard brake pedal, and complete deactivation of ABS and ESC functions.

This severe fault compromises driving safety.

4
Cases Logged
Real-World Cases
BYD DTC AI Analysis

Song PLUS DM-i: Water ingress corroded IPB connector after wading

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After driving through water, the dashboard displayed a brake system fault. Read fault code C053F00. Inspection found water ingress and green corrosion inside the IPB harness connector (located near the left front chassis rail). Resistance between the power and signal pins of pressure sensor 1 measured only 200Ω (abnormal). Cleaned the connector thoroughly with electronic cleaner, dried it, applied conductive grease, and replaced the waterproof seal. Fault resolved. Check the front compartment seal and waterproofing at the IPB mounting location.
BYD DTC AI Analysis

Seal EV: Replaced IPB assembly to resolve internal sensor fault

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While driving, the ABS/ESC warning light suddenly illuminated, the brake pedal went hard, and DTC C053F00 set. Checked wiring harness, power supply (5V normal), and ground—all normal. No shorts or opens in the signal line. Oscilloscope showed sensor output stuck at 4.9V without changing with pedal movement (normal: 0.5–4.5V linear). Diagnosed as IPB internal pressure sensor 1 failure. Replaced the IPB assembly (part number 1314600-XX), performed coding and brake bleed calibration. Fault resolved.
BYD DTC AI Analysis

Yuan Plus chassis wiring harness wear caused intermittent short circuit

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Owner reported intermittent brake system warnings, easily triggered on rough roads. Scan tool retrieved stored DTC C053F00. Raised the vehicle and found the IPB-to-body harness transition had detached from its retaining clip at the firewall penetration. The harness had chafed against the steering rack boot, damaging the signal wire insulation and causing intermittent shorts to ground. Repaired the damaged harness with double-layer heat-shrink tubing, resecured the routing, and added corrugated tubing protection. The fault has not reoccurred.
BYD DTC AI Analysis

Qin PLUS DM-i software false positive fixed by reflash

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New vehicle set C053F00 during PDI. Checked wiring harness, sensor power supply and signal — all normal. IPB hardware was early revision. Suspected early software version had a bug in the pressure sensor signal filtering algorithm, causing intermittent false positives. Resolution: Upgraded IPB module software via VDS (V1.02 to V1.05). Cleared fault codes after upgrade. Road tested multiple times without recurrence. No hardware replacement required.
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.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: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.