Low — S1BMW 3 Series · european tier
B0077 on BMW 3 Series
The B0077 diagnostic trouble code on a BMW 3 Series indicates third row center seat belt pretensioner deployment control. For BMW vehicles, this code is commonly triggered by faulty seat motor/module — most common cause, test before replacing or damaged or corroded wiring/connector in the power seat system circuit.
Can You Still Drive?
Safe to drive. Check at your convenience.
Estimated Repair Cost
$100 – $800
for BMW 3 Series
Common on This Vehicle?
B0077 appears less frequently on BMW 3 Series models but should still be diagnosed promptly.
Repair Costs for B0077 on BMW 3 Series
These repairs are commonly needed to resolve the B0077 code on a BMW 3 Series:
See all repair costs for BMW 3 Series →Symptoms on BMW 3 Series
- •Power seat won't move in one or more directions
- •Seat memory settings not saving or recalling correctly
- •Diagnostic trouble code (DTC) stored in module memory
- •Fault may be intermittent — code may clear itself and reappear
- •Reduced vehicle functionality related to the power seat system
Common Causes
- •Faulty seat motor/module — most common cause, test before replacing
- •Damaged or corroded wiring/connector in the power seat system circuit
- •Blown fuse or faulty relay for the power seat system
- •Poor ground connection — check and clean all related ground points
- •Control module fault — rare but possible, only consider after ruling out simpler causes