What is the B button on a Toyota Yaris Hybrid?
The B button is an engine-braking mode on the Toyota Yaris Hybrid. It increases deceleration when you lift off the accelerator and can boost regenerative braking to help recharge the battery during deceleration.
How the B mode works
The Yaris Hybrid uses an electronic continuously variable transmission (e-CVT). When you move the gear selector into B, the system applies enhanced engine braking so the petrol engine slows the car more aggressively. This mode can also trigger higher levels of regenerative braking, capturing energy back into the high-voltage battery as you decelerate. The result is stronger deceleration than in D, without pressing the brake pedal, and it is intended mainly for controlled slowing on hills or long descents.
Engagement and operation
Engaging B does not cause the vehicle to lose traction or become unstable; it simply alters how aggressively the motor and generator slow the car. You can return to D whenever you need normal acceleration and driving feel.
When to use B mode
Use B mode in specific driving scenarios to improve control and reduce brake wear. It is particularly helpful on long downhill stretches or steep grades where constant braking could lead to brake fade, and when you want to maximize energy regeneration during deceleration. For typical stop-and-go city driving, D is usually more suitable and efficient.
- Long downhill descents or steep grades where you want steady deceleration without heavy use of the foot brakes.
- Situations where you prefer stronger deceleration without using the brake pedal.
- Descent driving where additional energy regeneration back to the battery is desirable.
In practice, B mode is a supplementary control for deceleration, not a replacement for careful driving. For most urban driving, remaining in D provides smoother and more efficient operation.
Operational tips and cautions
Remember that B mode does not offer extra power for acceleration. If you need to accelerate, switch back to D. Avoid using B on slippery surfaces where engine braking could unsettle the vehicle. Always consider road conditions and drive accordingly, using B primarily on hills and descents as intended.
Summary
The B button on a Toyota Yaris Hybrid engages stronger engine braking and boosts energy recovery during deceleration. It is best used on long downhill runs or steep grades to maintain speed and reduce brake wear, but it is not a substitute for safe, attentive driving. Switch to D for normal city driving and return to B when descending or when additional deceleration and charging efficiency are desired.
