AU
P060700

DTC P060700 indicates a functional fault in the internal control processor (MCU/ECU) of the IPB (Intelligent Power Brake) — Qin Plus

Braking System

DTC P060700 indicates a functional fault in the internal control processor (MCU/ECU) of the IPB (Intelligent Power Brake).

This fault stems from a hardware-level or low-level software abnormality, specifically involving a main control chip calculation error, memory checksum failure, watchdog timeout reset, or internal bus communication interruption.

As a core braking component on BYD e-Platform 3.0 and DM-i models, the IPB integrates ESP, ABS, EBD, energy recovery, and brake assist functions.

This fault causes brake assist failure (hard brake pedal), loss of ESC/ABS functions, and Automatic Emergency Braking (AEB) deactivation.

It may also trigger limp-home mode (speed-limited driving).

When this fault occurs, the IPB enters a safety protection state and defaults to pure hydraulic braking.

This severe fault compromises driving safety.

5
Cases Logged
5
Causes
Likely Causes — Qin Plus
  • 1Internal ECU hardware damage in the IPB electro-hydraulic module: cold solder joints on the main control chip (Infineon or NXP series), corrupted memory (Flash/EEPROM) data, or peripheral circuit component failure (capacitors, crystal oscillator). Batch hardware defects or long-term vibration commonly cause this damage.
  • 2Power supply system fault: Unstable voltage (below 9V or above 16V) in the IPB power supply circuit (constant power B+, ignition power IG1), loose or oxidized ground terminals, or insufficient battery charge causing abnormal processor reset.
  • 3Software operation fault: IPB control program version contains a bug (such as V1.2 on early Song PLUS DM-i models) that causes excessive CPU load or memory overflow under specific operating conditions (such as frequent energy recovery switching + emergency braking).
  • 4Electromagnetic interference (EMI): Electromagnetic pulses generated by high-power radio equipment, aftermarket electrical accessories, or damaged high-voltage wiring harness shielding disrupt CAN communication or processor clock signals.
  • 5Wiring harness connector fault: Backed-out terminals, water ingress corrosion, or excessive contact resistance at the IPB module 32-pin connector (especially power supply pins 1-4 and ground pins 5-8), causing momentary interruption of the processor power supply.
What To Do
  • 1
    Initial diagnostic scan: Use the BYD VDS2000/VDS3000 to read all DTCs. Confirm if P060700 is an active fault. Check for accompanying fault codes (e.g., U1000 communication fault, C1234 brake pressure sensor fault). Record freeze frame data (vehicle speed, brake pressure, and voltage values at the time of the fault).
  • 2
    Power and ground check: Disconnect the IPB module connector. Measure voltage at pin 1 (terminal 30 constant power) and pin 2 (terminal 15 ignition power) (standard: 12.6 ± 0.3 V). Check ground resistance at pins 5-8 (< 1 Ω). Use an oscilloscope to monitor voltage drop during engine startup to confirm if it falls below 9 V and triggers the fault.
  • 3
    Communication bus inspection: Measure CAN-H (pin 9) and CAN-L (pin 10) voltage to ground (2.5V±0.1V) and terminal resistance (60Ω±5Ω). Check the CAN waveform for distortion or noise, and eliminate electromagnetic interference.
  • 4
    Software flash: If hardware checks are normal, use VDS to update the IPB module software (version V2.1 or later). Before flashing, back up calibration data for the steering angle sensor, brake pressure sensor, and other components. After flashing, clear the DTC and perform a 30-minute road test.
  • 5
    Assembly replacement and matching: If the fault persists, replace the IPB electro-hydraulic assembly (part number: SC-3630100-B1). After replacement, perform: ① brake system bleeding (requires a dedicated fluid bleeding tool); ② steering angle sensor calibration (G85); ③ longitudinal/lateral acceleration sensor calibration; ④ brake pressure sensor zero-point calibration; ⑤ AEB function road test verification.
  • 6
    Deep verification: Perform a 20km road test, including ABS activation (hard braking at 40km/h), energy recovery (coasting in B gear), and limp mode verification. Confirm the fault code does not return and all warning lights are off.
Real-World Cases
BYD DTC AI Analysis

Cold solder joint on Song Plus DM-i IPB main board causes intermittent fault

✓
2021 Song PLUS DM-i, 23,000 km. Dashboard intermittently lit the ABS/ESC warning light; DTC P060700 set intermittently. Fault frequency higher during cold starts. Diagnosis revealed dry solder joints on the main control chip (Infineon TC397) on the PCB inside the IPB module; thermal expansion caused poor contact. Replaced the IPB assembly, bled the brake lines and calibrated the sensors on the new module. No recurrence after three months.
BYD DTC AI Analysis

Aftermarket dash cam installation caused electromagnetic interference fault

✓
Non-OEM dashcam installed (constant power tap), power line routed parallel to IPB supply. P060700 set intermittently while driving with U1000 communication fault. Testing found the dashcam had poor power filtering, generating high-frequency interference that coupled into the IPB processor through the wiring. Rewired to maintain >30cm from high-voltage harness, installed ferrite core filter, and updated IPB software to the interference-hardened version.
BYD DTC AI Analysis

Software bug triggered processor overload

✓
Drove on highway using ACC heavily (follow-brake-accelerate cycles). After one hour, P060700 set and brake assist failed. Diagnosis: Early software version (V1.15) triggered watchdog reset when CPU load exceeded 95% during frequent switching between regenerative and mechanical braking. Fix: Upgraded IPB software to V2.05, optimizing the brake energy recovery algorithm to reduce processor load.
BYD DTC AI Analysis

Battery aging triggered low voltage fault

✓
Battery was 3 years old and never replaced. During cold winter cranking, voltage dropped to 8.2V, triggering P060700 that would not clear. Measured voltage waveform at the IPB power supply terminal during cranking and found an 8V undervoltage pulse lasting 10ms, causing an abnormal processor reset. Solution: Replaced the AGM battery (12V 60Ah) and cleaned the IPB ground terminal (G106); fault cleared.
BYD DTC AI Analysis

IPB internal short circuit and corrosion after water ingress

✓
After driving through water exceeding half the tire height, the brake system warning light on the instrument panel remained illuminated and DTC P060700 set. Removal and inspection of the IPB module revealed deterioration of the electro-hydraulic control unit seal, allowing coolant (or rainwater) to enter the ECU housing. This short-circuited the main board electrolytic capacitors and burned out the processor power supply chip. Solution: Replaced the IPB assembly, checked the waterproof sealing of related wiring harness connectors, and replaced the brake fluid (moisture content exceeded specification).
Other Qin Plus 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.