Can I shift to L while driving?

Shifting to L is technically possible in many automatic transmissions, but it’s generally not recommended for normal driving. Use it only in specific conditions and with awareness of your vehicle’s manual guidance.

This article explains what the L setting does, when you should use it, and how to handle it safely across different vehicle types. It also covers practical alternatives for everyday driving and safety considerations on hills, slippery surfaces, and towing.

What "L" means in automatic transmissions

L, or "Low," is a gear selection that keeps the transmission in a low gear ratio (often first or a very low ratio). It increases engine braking, helps control speed on steep descents, and provides more torque at low speeds for starting on slippery surfaces. Modern transmissions may automatically limit downshifts to protect the engine and drivetrain.

Different systems, different behavior

The exact effect of L varies by vehicle. In traditional automatics, L locks into a lower gear. In continuously variable transmissions (CVTs), L holds the engine at the lowest available ratio rather than selecting a specific gear; hybrid systems may use engine braking and regenerative braking in L in different ways. Always refer to your owner’s manual for specifics.

When you should consider using L

There are a few circumstances where selecting L can be beneficial. Before listing, note that you should only use L at very low speeds or when a controlled engine braking is needed. Below are common scenarios.

• Descending long or steep grades to help manage speed with engine braking and reduce brake overheating.


• Starting on very slippery surfaces (snow, ice, wet leaves) to limit wheel spin and gain traction with controlled acceleration.


• Towing or hauling heavy loads on grades where extra engine braking helps maintain steady speed.

In most daily driving, you should avoid using L; shift back to D as soon as you’ve achieved the needed control or the road conditions change. Permanent use of L is not intended for normal cruising.

What to do instead for normal driving

If you want more control on downhills or in poor traction, there are safer, more common alternatives to using L. Depending on your vehicle, these options include manual downshifts via paddles or the gear lever in a manual mode, using engine braking within the limits of the transmission, or relying on proper speed and braking technique.

• Brake gradually and steadily to manage speed on declines; avoid riding the brakes.


• Use a lower gear only temporarily to help control speed, then return to Drive as conditions improve.


• In vehicles with manual mode or paddle shifters, downshift progressively to a safe gear rather than abruptly jumping to L at speed.

Remember: Shifting to L at highway speed can cause sudden deceleration that may surprise you and can stress the drivetrain or trigger safety protections. Always plan ahead on descents and consult your manual for vehicle-specific guidance.

Safety and vehicle-specific notes

Due to variations in transmission design, modern cars may prevent shifting into L at high speeds or under heavy load. Always verify the procedure in your owner's manual. If you drive a hybrid or CVT-equipped vehicle, the effect of L on engine braking and regenerative braking may differ from traditional automatics; be aware of how your system behaves especially during braking and acceleration.

Bottom line: Shifting to L is possible in many vehicles but should be used judiciously and in alignment with the manufacturer guidance. For normal driving, keep in D and avoid unnecessary shifts to L unless you’re in a circumstance that specifically calls for it.

Summary

In brief, L stands for Low gear and provides engine braking and torque control. It is intended for specific conditions such as downhill descents, slippery surfaces, or when towing, not for everyday driving. Use it sparingly, know your vehicle's behavior, and return to D once you've achieved the necessary control. When in doubt, consult the owner's manual or a professional mechanic.

Is it okay to switch modes while driving?

Yes, it is generally safe to change drive modes while driving, as modern cars are designed for this and the electronic control unit (ECU) manages the transition. It is best to switch to modes like Sport or Eco while driving at a steady speed, and always be aware of your surroundings and consider letting off the accelerator for a smoother shift. However, avoid changing to off-road modes like "Mud/Ruts" or "Rock Crawl" while driving on paved roads, and only switch to a specific mode if the car's manual permits it. 
This video explains what happens to your car in normal, sport, and eco driving modes: 53sHistory of Simple ThingsYouTube · Aug 4, 2025
Safe to switch

• Modern vehicles: The ECU will prevent unsafe changes and adjust the vehicle's parameters like throttle response, transmission shift points, and steering to match the new mode. 
• On-road modes: Switching between normal, eco, and sport modes is safe during driving. 
• Safety first: It is still best practice to switch when at a steady speed rather than during an aggressive maneuver. 

When to be cautious

• Off-road modes Avoid changing to off-road modes while driving on paved roads, as they are meant for specific low-speed situations like mud or sand. 
• Specific instructions Some manuals may include specific warnings, so always consult your owner's manual for any restrictions. 
• Smooth transition Letting off the accelerator for a moment before changing modes can result in a smoother transition. 

This video demonstrates the effects of different drive modes, including sport mode, on a car: 53sSteve CliffordYouTube · May 5, 2023

Is it bad to drive in L-gear?

No, it is not bad to drive in low gear, but it's only beneficial in specific situations like driving up steep hills, descending long declines, or towing heavy loads. Driving on level roads or highways in low gear is not recommended because it wastes fuel and causes unnecessary engine wear and tear due to higher RPMs. 
When to use low gear

• Steep hills: Provides extra torque for climbing without stressing the engine. 
• Long declines: Uses engine braking to maintain a steady speed, reducing the need to ride the brakes and preventing them from overheating. 
• Towing heavy loads: Offers more engine power to handle the extra weight. 
• Slippery conditions: Can provide more control at lower speeds. 

When NOT to use low gear

• Highway or high-speed driving: The engine runs at unnecessarily high RPMs, which wastes fuel and causes extra wear. 
• Flat, open roads: Higher gears are more fuel-efficient for cruising on flat terrain. 

Important considerations

• Engage low gear at low speeds: Avoid shifting into low gear at high speeds, as this can cause excessive engine revving and strain on the transmission. 
• Modern car safety features: Many modern cars have electronic controls that prevent the computer from allowing the transmission to shift to a low enough gear to damage the engine if you accidentally engage it at high speeds. 
• Check your owner's manual: Always consult your car's owner's manual for specific information and recommendations regarding your vehicle's "L" mode. 

Is it bad to shift into drive while moving?

Short answer: momentary shifts between D (Drive) and N (Neutral) while the car is moving are not usually catastrophic for modern automatic transmissions, but they are unnecessary and can cause wear, safety risks, and potential damage if done repeatedly or inappropriately.

Can I switch to 4L while driving?

Can you switch to four-wheel drive low-range while driving? Yes. You can shift into 4x4 Low when the vehicle is rolling at 2 to 3 mph (3 to 5 km/h) by shifting an automatic transmission into Neutral or depressing the clutch pedal on a manual transmission and then shifting into low range.