Serious — S4Toyota Corolla · economy tier
B0020 on Toyota Corolla
The B0020 diagnostic trouble code on a Toyota Corolla indicates left side airbag deployment control. For Toyota 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 Toyota Corolla
Common on This Vehicle?
The B0020 code is relatively common on Toyota vehicles and often appears alongside other diagnostic codes.
Repair Costs for B0020 on Toyota Corolla
These repairs are commonly needed to resolve the B0020 code on a Toyota Corolla:
See all repair costs for Toyota Corolla →Symptoms on Toyota Corolla
- •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