AU
P060700

DTC P060700 indicates a functional fault in the internal control processor (MCU/ECU) of the IPB (Intelligent Power Brake) — Atto 8

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 — Atto 8
  • 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 oscillators), typically resulting from batch hardware defects or long-term vibration.
  • 2Power supply system fault: Unstable voltage (below 9V or above 16V) in the IPB power supply circuit (constant power B+, ignition IG1), loose or oxidized ground terminals, or low battery charge causing abnormal processor reset.
  • 3Software operation fault: IPB control program version bug (such as early Song PLUS DM-i V1.2) 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, non-OEM electrical accessories, or damaged high-voltage wiring harness shielding disrupt CAN communication or processor clock signals.
  • 5Wiring harness connector fault: IPB module 32-pin connector (especially power pins 1-4 and ground pins 5-8) has backed-out terminals, water ingress corrosion, or excessive contact resistance, causing momentary interruption of the processor power supply.
What To Do
  • 1
    Initial diagnostic scan: Use BYD VDS2000/VDS3000 to read all DTCs. Confirm if P060700 is a current fault (Active). 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 supply and ground check: Disconnect the IPB module connector. Measure the voltage at pin 1 (terminal 30, constant power) and pin 2 (terminal 15, ignition power) (standard: 12.6 ± 0.3 V). Check the ground resistance at pins 5-8 (must be less than 1 Ω). Use an oscilloscope to monitor the voltage drop during engine start. Confirm if the voltage 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 terminating resistance (60Ω±5Ω). Check the CAN waveform for distortion or noise to rule out electromagnetic interference.
  • 4
    Software reflash: If hardware checks are normal, use VDS to update the IPB module software (version V2.1 or later). Before reflashing, back up calibration data for the steering angle sensor, brake pressure sensor, and other components. After reflashing, 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 draining 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
    In-depth verification: Perform a 20 km road test including an ABS activation test (hard braking at 40 km/h), an energy regeneration test (coasting in B gear), and limp mode verification. Confirm the fault code does not recur 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 Atto 8 Fault Codes
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.B110A02DTC B110A02 indicates the thermal management master control unit (HVAC ECU) or body control module (BCM) failed to receive valid CAN data frames from the PM2.5 air quality sensor over consecutive communication cycles (typically 500ms per cycle). The sensor typically mounts at the HVAC unit air inlet or behind the glove box and transmits real-time particulate concentration data (unit: μg/m³) to the HVAC controller via the CAN bus. The fault is essentially a communication link layer timeout. Potential causes include physical layer wiring faults, sensor power supply failures, sensor internal MCU lockup, or CAN network topology damage. Although this non-critical fault does not directly affect driving safety, it disables the intelligent air purification strategy and the automatic fresh air/recirculation switching function. In extreme cases, it triggers a thermal management system degraded mode, limiting compressor power or fixing the air flap position.B110B07This fault code indicates abnormal operation of the internal air pump (sampling pump) in the PM2.5 air quality detection module. The PM2.5 detector uses the laser scattering principle to measure particulate concentration and requires a built-in air pump to draw ambient air into the detection chamber at a constant flow rate. The ECU sets this code when it detects an open or short in the air pump drive circuit, abnormal current (stall or free-running), or abnormal speed feedback. This fault causes the automatic air conditioning system to lose air quality sensing capability, preventing automatic switching between fresh air and recirculation modes. The instrument cluster air quality display may show '--' or a fixed value, but the fault does not affect the vehicle powertrain or basic air conditioning cooling and heating functions.B173CDTC B173C indicates the Supplemental Restraint System (SRS) detects the Right Second Row Side Airbag squib circuit resistance exceeds the calibrated threshold (typically >4.5Ω). This fault is an active diagnostic result of the SRS system, indicating a high-resistance condition in the circuit between the Airbag Control Unit (ACU) and the airbag module. Causes for excessive resistance include increased contact resistance, a partially broken wiring harness, terminal oxidation, or an aging squib wire inside the airbag module. This fault causes the system to mark the airbag circuit as 'unreliable', meaning the airbag may fail to deploy during a collision. The fault typically illuminates the instrument cluster airbag warning light (SRS light) continuously, and some models also sound a warning buzzer.
Common problems reported for Atto 8 →Atto 8 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.