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2019 AUDI A6
3.0L V6 TFSI•AWD•AUTOMATIC•gas•supercharged
7 active safety recalls on this vehicle — view recalls
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Repairs0Labor495Torque4326Fluid9DTC1145Battery1Maintenance0Recalls7
P3805moderate severityPowertrain

48V Battery Temperature Sensor Circuit Malfunction

on 2019 Audi A6 3.0L V6 TFSI · AWD

What this code means

The 48V lithium-ion battery temperature sensor is reporting values outside the expected range.

Symptoms

  • 48V system may be limited
  • Charging/discharging restricted as precaution
  • Inaccurate temperature reading
  • Mild hybrid functions intermittent
  • 48V battery warning

Common causes

  • Temperature sensor failure
  • Sensor wiring open or shorted
  • Connector corrosion
  • Sensor out of calibration
  • Thermal paste degradation on sensor

Diagnostic steps

  1. Read 48V battery temperature PID
  2. Compare to infrared temperature measurement
  3. Test sensor resistance vs specification
  4. Inspect sensor connector
  5. Check wiring for damage

Repair notes

Replace 48V battery temperature sensor. Ensure proper thermal contact with battery cells.

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