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U1332-00

DTC U1332-00 indicates the airbag control unit (SRS ECU) receives an abnormal or timed-out vehicle speed signal via the body CAN bus (B-CAN) — Seal U

Safety System

DTC U1332-00 indicates the airbag control unit (SRS ECU) receives an abnormal or timed-out vehicle speed signal via the body CAN bus (B-CAN).

This fault occurs when the SRS module fails to receive a valid vehicle speed data frame from the instrument cluster or ABS/ESP module within the predetermined cycle, preventing the airbag system from determining collision severity based on real-time vehicle speed.

This safety system communication fault compromises the collision safety strategy, potentially causing airbag deployment timing deviations during high-speed collisions or false deployments during low-speed collisions.

5
Cases Logged
Real-World Cases
BYD DTC AI Analysis

BYD S6 instrument cluster CAN module damage caused loss of vehicle speed signal

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The airbag warning light illuminated on the instrument cluster. The scanner retrieved DTC U1332-00. The speedometer displayed normal readings while driving, but the SRS system reported a vehicle speed fault. The technician checked B-CAN network communication with an oscilloscope and found it normal, but found that speed data frames sent from the instrument cluster to the SRS were occasionally lost. The technician traced the fault to the internal CAN communication module in the instrument cluster and replaced the assembly with a genuine part. Fault resolved.
Original source ↗
BYD DTC AI Analysis

BYD NEV precharge resistor failure caused CAN network failure

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The vehicle presented with a powertrain fault and multiple CAN communication DTCs including U1332-00. Diagnosis found a damaged front-end pre-charge resistor in the high-voltage battery pack, disrupting communication between the BMS and vehicle controller and affecting vehicle speed signal transmission across the CAN network. Replaced the pre-charge resistor and performed cell balancing on the battery pack. Network communication returned to normal and the U1332 DTC cleared.
Original source ↗
BYD DTC AI Analysis

Protocol mismatch caused by non-genuine instrument cluster in accident-repaired vehicle

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After accident repairs, the airbag warning light stayed on. Retrieved DTC U1332-00. Inspection found an aftermarket instrument cluster installed during the repair. The speedometer displayed correctly, but the cluster’s CAN protocol differed from the SRS module’s, so the SRS could not parse the vehicle speed data. Replaced the cluster with an OEM unit and reconfigured the SRS system parameters. Fault resolved.
Original source ↗
BYD DTC AI Analysis

BYD S6 left A-pillar wiring harness damage causing intermittent CAN-L short circuit

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On starting the vehicle after parking, the airbag warning light illuminated with DTC U1332-00 stored. Inspection found water stains on the G10 connector. Further investigation revealed the wiring harness beneath the left A-pillar had insulation damage from a previous accident repair, contacting the body metal and causing an intermittent short to ground on the CAN-L line. Repaired the damaged wiring, cleaned oxidation from the connector and applied waterproofing. Fault cleared.
Original source ↗
BYD DTC AI Analysis

Internal transceiver damage in SRS control unit caused vehicle-wide communication failure

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Multiple warning lights (ABS, SRS, ESP) illuminated simultaneously while driving. Scanner retrieved communication fault codes including U1332-00 and U0140. Using segmented troubleshooting, disconnected the SRS module; other systems returned to normal. Confirmed faulty CAN transceiver inside the SRS control unit continuously transmitting error frames and paralyzing the B-CAN network. Replaced the SRS control unit, recoded and matched it to the vehicle. Fault completely resolved.
Other Seal U 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.