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B132212

This fault code indicates a short to power or short to ground in the signal circuit of the refrigerant pressure sensor at the plate heat exchanger (Chiller) outlet in the Battery Thermal Management System (BTMS) — Qin Plus

Thermal Management System

This fault code indicates a short to power or short to ground in the signal circuit of the refrigerant pressure sensor at the plate heat exchanger (Chiller) outlet in the Battery Thermal Management System (BTMS).

The plate heat exchanger is a key heat exchange component in the battery liquid cooling circuit.

Its outlet pressure serves as a critical parameter for the system to evaluate refrigerant status and control electronic expansion valve opening and compressor speed.

When a short circuit occurs in the sensor signal wire, the control unit (typically the battery manager or integrated thermal management controller) detects an abnormal voltage signal (near 0V or supply voltage), preventing accurate refrigerant pressure data acquisition.

The system enters fail-safe protection mode and may limit battery charge and discharge power, disable the battery cooling function, or trigger a Level 1 or Level 2 fault warning.

Long-term operation risks traction battery overheating and may trigger thermal runaway protection in extreme cases.

3
Cases Logged
5
Causes
Likely Causes — Qin Plus
  • 1Damaged sensor wiring harness insulation contacts a body metal component or power wire, causing a short circuit.
  • 2Breakdown and short circuit in the pressure sensor internal piezoresistive element or signal processing circuit.
  • 3Pin-to-pin short circuit or short to ground in front compartment or chassis connectors due to water ingress or poor sealing.
  • 4Improperly securing the wiring harness during repair causes it to rub against the high-temperature exhaust pipe or rotating parts, damaging the harness.
  • 5Internal fault in the control unit signal sampling circuit causing a short to ground in the sensor power supply or signal line.
What To Do
  • 1
    Use the VDS2000/VDS3000 diagnostic tool to read the complete fault codes and confirm B132212 is a current fault that will not clear.
  • 2
    Refer to the wiring diagram and locate the plate heat exchanger outlet pressure sensor (usually located at the front end of the battery cooling line, near the Chiller outlet).
  • 3
    Disconnect the sensor connector and measure the resistance on the sensor side (normal range: several hundred to several thousand ohms; refer to the repair manual for specific standard values). If the resistance is 0 or infinite, replace the sensor.
  • 4
    Disconnect the control unit connector and measure continuity from the harness-side signal wire to ground and to power. If continuity exists, inspect the wiring harness for damage.
  • 5
    Check the connector pins for corrosion, push-out, or deformation. Clean or replace the connector if necessary.
  • 6
    Measure the signal output voltage on the control unit side (normal: 0.5-4.5V, varying with pressure). If the voltage is abnormal, repair or replace the control unit.
  • 7
    After repairing the wiring harness or replacing the sensor, clear the fault code and perform the battery cooling system self-learning procedure (if applicable).
  • 8
    Perform a road test or bench test, monitor the battery cooling system pressure data stream, and confirm the fault is resolved.
Real-World Cases
BYD DTC AI AnalysisFrom Chinese market (translated)

Qin Pro DM threw code B132212 and battery cooling failed after driving through water.

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Symptoms: After driving through water, the dashboard displayed "Powertrain System Fault" and the battery cooling system stopped working. Retrieved DTC B132212 (current). Diagnosis: Lifted the vehicle and found significant water inside the connector for the battery cooling system plate heat exchanger outlet pressure sensor. Electrolytic corrosion caused a short circuit between the pins. Measured the sensor signal wire-to-ground resistance at 0.2Ω (normal: >10kΩ). Resolution: Thoroughly cleaned the connector, dried the wiring harness with compressed air, applied special conductive paste, and replaced the waterproof seal. The fault cleared. Followed up for one week, no recurrence.
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD Qin EV300 reports intermittent pressure sensor short circuit after accident repair

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Symptoms: Following front collision repairs, the vehicle intermittently flagged thermal management system faults while driving. DTC B132212 was intermittent. Diagnosis: Inspection revealed the engine bay harness was improperly secured after the collision repair. The plate heat exchanger outlet pressure sensor loom was rubbing against the high-voltage PTC water heater metal pipe. Driving vibrations wore through the insulation, causing the copper wire to short intermittently to earth. Harness-to-earth resistance measured infinite, dropping to 0Ω when the loom was shaken. Solution: Rerouted the harness, protected it with high-temperature-resistant corrugated tubing, and secured it to the original mounting points. Replaced the damaged wiring. This permanently resolved the fault.
BYD DTC AI AnalysisFrom Chinese market (translated)

BYD Qin Pro EV continuously reports B132212 after Chiller replacement

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Symptoms: After replacing the plate heat exchanger assembly, the vehicle set DTC B132212 immediately on startup. The code could not be cleared. Diagnosis: The technician had mistakenly reversed the outlet pressure sensor and inlet temperature sensor connectors. This caused a signal wire definition mismatch, creating a short to power. Measured voltage at the connector terminal: signal wire voltage was 12 V (normal: 0–5 V analog signal). Solution: Swapped the connectors to their correct positions. Cleared the fault codes. Live data showed outlet pressure at 0.35 MPa (within normal range) and the system operated normally. Recommendation: The Qin Pro EV thermal management sensor connectors have similar fool-proof designs. Check the markings carefully during repairs to avoid misconnection.
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. Sources: [1]