What does B mean in Lexus CT 200h?
The B on the Lexus CT 200h’s gear selector is the engine braking/regenerative braking mode. When selected, it increases deceleration by using the electric motor as a generator and adding engine braking, which helps recharge the battery and reduces brake wear during slow-downs.
Meaning and mechanism in the CT 200h
In the CT 200h, the Hybrid Synergy Drive combines a gasoline engine with an electric motor/generator. The B position is designed to enhance deceleration by commanding more regenerative braking and greater engine drag. This means you slow down more quickly when you lift off the accelerator, and part of that deceleration energy is returned to the battery where feasible.
How it interacts with normal drive
In standard D (drive) mode, the hybrid system provides gentle regen and smooth acceleration. Selecting B increases the level of regenerative braking and engine braking, which changes the feel of deceleration and can help charge the battery more aggressively during descent or prolonged deceleration.
Practical driving with B mode
Drivers use B mode to gain tighter control on hills and to maximize energy regeneration during deceleration. It’s less common for stop-and-go city driving, where a smoother deceleration is often preferred in D mode.
Common scenarios where B mode is beneficial:
- Descending long or steep hills to maintain steady speed without overusing the brake pedal
- Maximizing regenerative charging when you want to build battery SOC during downhill driving
- Reducing brake wear on extended deceleration periods
- Improving predictability of deceleration on slippery or uneven grades
Conclusion: B mode is a useful tool for energy management and controlled slowing in specific conditions. Switch back to D when you want a smoother, more conventional deceleration feel.
How to engage B mode
To engage B mode, follow these steps:
- With the car in drive, shift the gear selector from D to B to activate enhanced engine braking and regenerative deceleration.
- Release the accelerator to initiate the stronger deceleration; the electric motor typically works as a generator to replenish the battery while slowing the car.
- When you want normal driving behavior again, shift back from B to D to resume standard deceleration and throttle response.
Note: B mode is not a substitute for braking in an emergency. Use the brakes as needed for abrupt stops, and return to D for regular driving when increased regen is no longer desired.
Summary
In the Lexus CT 200h, B stands for an engine/braking mode that increases regenerative braking and engine drag to slow the car more aggressively and to charge the battery. It’s best used on descents or when you want to maximize energy regeneration, and it is typically engaged by shifting the selector from D to B. For everyday city driving, D remains the smoother default option.
