Serious — S4Hyundai Tucson · economy tier
B0040 on Hyundai Tucson
The B0040 diagnostic trouble code on a Hyundai Tucson indicates third row left side airbag deployment control. For Hyundai vehicles, this code is commonly triggered by faulty airbag module — most common cause, test before replacing or damaged or corroded wiring/connector in the airbag/srs (supplemental restraint) system circuit.
Can You Still Drive?
Drive to a shop soon. Risk of damage if ignored.
Estimated Repair Cost
$100 – $2,000
for Hyundai Tucson
Common on This Vehicle?
The B0040 code is relatively common on Hyundai vehicles and often appears alongside other diagnostic codes.
Repair Costs for B0040 on Hyundai Tucson
These repairs are commonly needed to resolve the B0040 code on a Hyundai Tucson:
See all repair costs for Hyundai Tucson →Symptoms on Hyundai Tucson
- •Airbag/SRS warning light on — airbags may be disabled
- •Check Engine Light illuminated
- •Seat belt pretensioner may not deploy in a collision
- •Diagnostic trouble code (DTC) stored in module memory
Common Causes
- •Faulty airbag module — most common cause, test before replacing
- •Damaged or corroded wiring/connector in the airbag/SRS (supplemental restraint) system circuit
- •Blown fuse or faulty relay for the airbag/SRS (supplemental restraint) system
- •Poor ground connection — check and clean all related ground points
- •Control module fault — rare but possible, only consider after ruling out simpler causes