DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)

1. Identification Customer feedback: The vehicle’s dashboard light is illuminated, and HDS checks show a fault code, as shown in the image.DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)2. Analysis2.1. Fault Description:

  • When a fault is detected, the 12V charging system warning light and alarm are illuminated, and the DTC and freeze frame data are stored in the VCU memory.
  • The VCU establishes communication with the EBS via LIN1. If the VCU receives a fault signal (ERR_COMMON=1) from the battery sensor, it will illuminate the relevant fault light.

DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)2.2. Wiring Diagram:DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)2.3. Possible Causes:

  • Battery sensor fuse failure
  • Wiring issues between the VCU and battery sensor
  • Faulty VCU or battery sensor components

3. IsolationCheck the battery sensor fuse and find that the fuse is blown:DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)4. RepairReplace the fuseDTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)5. ConfirmationFault clearedRepair Notes:

  • EBS: Refers to the 12V battery sensor.
  • Before replacing the battery sensor, check if its fuse is damaged.

DTC P154A-F1: Internal Fault Diagnosis of Battery Sensor (DH3)

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