AU
P060700

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

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 — Seal U
  • 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 prolonged 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 insufficient battery charge causing an abnormal processor reset.
  • 3Software operation fault: IPB control program bug (such as V1.2 on early Song PLUS DM-i models) 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 retrofitted 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) cause a momentary interruption of the processor power supply.
What To Do
  • 1
    Initial diagnostic scan: Use the BYD VDS2000/VDS3000 to read the complete DTC list. Confirm if P060700 is a current fault (Active). Check for accompanying fault codes (such as U1000 communication fault or 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 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 to confirm if it falls below 9 V and triggers the fault.
  • 3
    Communication bus inspection: Measure the 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 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 higher). 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 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
    Deep verification: Perform a 20km road test, including an ABS activation test (hard braking at 40km/h), an energy recovery test (coasting in B gear), and limp mode verification. Confirm the fault code does not return and all warning lights turn 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 Seal U Fault Codes
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.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.B110BDTC B110B indicates a fault in the internal air pump (sampling pump) of the PM2.5 air quality detector. This pump draws cabin or outside air into the PM2.5 sensor detection chamber, enabling the laser scattering sensor to measure real-time particulate matter concentration. The air conditioning controller (or BCM) sets this DTC upon detecting an open or short circuit in the pump drive circuit, or abnormal current caused by a seized pump motor. This fault disables the "Green Clean" system, causes the instrument cluster air quality display to read abnormally or disappear, and disables the automatic fresh air/recirculation switching function. It does not affect the vehicle powertrain or core thermal management functions.B173712DTC B173712 indicates a short to power in the firing circuit of the right second-row side airbag module in the Supplemental Restraint System (SRS). Specifically, the "right second-row side airbag" typically refers to the side impact airbag located in the right B-pillar or the side of the right seat. The "12" suffix indicates a circuit short to battery positive (B+). This fault causes the following conditions: 1) The airbag may fail to ignite and deploy during a collision, resulting in a loss of side impact protection. 2) In extreme cases, unintended triggering may cause accidental airbag deployment. 3) The SRS control unit detects abnormally high circuit voltage (typically above 4.5V) and enters fault protection mode. This may disable the entire airbag system and continuously illuminate the instrument cluster airbag warning light.
Common problems reported for Seal U →Seal U 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.