B0084low severityBody
Passenger Seat Lumbar Motor Circuit
on 2021 Audi A4 2.0L I4 TFSI · AWD
What this code means
Malfunction in the passenger seat lumbar support motor circuit.
Symptoms
- Passenger lumbar not adjusting
- No response from switch
- Motor running but no movement
Common causes
- Faulty motor
- Switch failure
- Wiring issue
- Mechanical linkage broken
Diagnostic steps
- Test switch
- Direct-power motor
- Inspect wiring
- Check mechanical linkage
Repair notes
Replace lumbar motor, switch, or repair linkage.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0009
Rear Center Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment