B392B
Seat Lumbar/Bolster Pump
B392B is an OBD-II diagnostic trouble code meaning: Seat Lumbar/Bolster Pump. Common causes: open circuit or short circuit in the wiring harness, pump motor malfunction. Estimated repair cost: $56–167.
Symptoms
- Lumbar support adjustment does not work
- The side bolsters of the seat do not inflate
- I hear a humming sound from the pump when trying to adjust
- Error message on display
Causes
- Open circuit or short circuit in the wiring harness
- Pump motor malfunction
- Problems with the seat control module
- Oxidation of contacts
- Mechanical damage to air tubes
How to Fix
- Check circuit fuse
- Inspect the wiring harness under the seat for damage.
- Check the voltage at the pump
- Test the operation of the pump directly from the battery
- If necessary, replace the pump or control unit
Related codes
Error B392B by Vehicle Brand
FAQ
What does the B392B code mean?
B392B is an OBD-II diagnostic trouble code that indicates: Seat Lumbar/Bolster Pump
What causes a B392B error code?
The most common causes of B392B include: Open circuit or short circuit in the wiring harness; Pump motor malfunction; Problems with the seat control module; Oxidation of contacts.
How do I fix a B392B diagnostic trouble code?
To fix B392B: Check circuit fuse. Inspect the wiring harness under the seat for damage.. Check the voltage at the pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B392B?
Do not drive — repair immediately
How much does it cost to fix B392B?
The estimated repair cost for B392B is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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