BYD Atto 3 Adaptive Cruise Control: Set It Up and Use It Safely

The BYD Atto 3's Adaptive Cruise Control (ACC) uses a front mmWave radar and camera to maintain your set speed while automatically adjusting distance from the vehicle ahead. It operates between 0 and 150 km/h, with cruise speed adjustable from 30 to 150 km/h in 5 km/h increments. The following distance has four levels controlled by the steering wheel buttons. ACC activates via the dedicated button on the steering wheel when the car is in Drive with the seat belt fastened and EPB released.

ACC vs Standard Cruise Control

Standard cruise control maintains a fixed speed regardless of traffic. ACC goes further by using radar to detect the vehicle ahead and automatically slowing down or speeding up to maintain a safe following distance. The Atto 3 owner's manual describes ACC as "an extension of traditional cruise control" that switches between fixed-speed cruising and distance-following automatically.

ACC is a comfort system, not a safety system. It is not an obstacle detector or collision warning system. You must keep control of the vehicle at all times.

How to Activate ACC: Step by Step?

1. Fasten your seat belt. ACC will not activate without it.
2. Ensure the car is in Drive with EPB released and all doors, hood, and boot closed.
3. Press the ACC button (①) on the steering wheel. The system enters standby mode.
4. ACC sets your current speed as the cruise speed by default. If you are below 30 km/h, it defaults to 30 km/h.
5. Adjust speed using the multifunctional lever (②). Toggle up to increase, down to decrease, in 5 km/h steps.
6. Set following distance using buttons ③ and ④ on the steering wheel. Four levels available.

ACC Activation Requirements

Measurement	Requirement
Gear position	Drive (D)
EPB status	Released
Seat belt	Driver belt fastened
Doors/hood/boot	All closed
ESC system	On but not actively intervening
Vehicle speed	Below 150 km/h
AEB status	Not currently activated
Network	No vehicle network fault displayed
Vehicle direction	Not sliding backwards

Setting Speed and Following Distance

Cruise Speed

• Range: 30 to 150 km/h (20 to 95 mph)
• Increment: 5 km/h per toggle of lever ②
• Memory: System remembers your last speed setting within the same ignition cycle. Push up lever ② to restore the stored speed.

Following Distance (4 Levels)

• Press button ③ to decrease following distance (closer to vehicle ahead)
• Press button ④ to increase following distance (more gap)
• Each level adjusts proportionally to speed. Faster speed means longer distance at the same level.
• Recommended for highway driving: Level 3 or 4 for maximum reaction time

How ACC Slows for Traffic Ahead?

When the radar detects a slower vehicle in your lane, ACC gradually reduces speed to match. It can bring the car to a complete stop if the vehicle ahead stops (Follow-to-Stop). The system then handles restarting based on stop duration:

• Stop under 30 seconds: ACC resumes automatically when the vehicle ahead moves
• Stop 30 seconds to 3 minutes: Press the accelerator pedal or push up lever ② to reactivate
• Stop over 3 minutes: ACC enters standby, EPB engages automatically

ACC can only achieve limited braking, not emergency braking. If the vehicle ahead brakes suddenly, ACC may respond late. Always stay alert and ready to brake manually.

Combining ACC with Intelligent Cruise Control (ICC)

ICC adds lane centring to ACC's speed control. It steers the car to stay centred in the lane while ACC manages speed and distance.

• ICC speed range: 0 to 120 km/h
• Requires: Clear lane markings detected by front camera
• Hands must stay on the steering wheel at all times
• ICC is suppressed when lane lines disappear (construction zones, faded paint)

When ACC Disengages Automatically?

• You press the brake pedal (ACC enters standby, reactivate after brake release)
• You press the ACC button again (returns to standby)
• ESC activates due to loss of traction
• The front radar or camera is blocked by dirt, mud, ice, or heavy rain
• A vehicle network communication fault appears
• The AEB system activates during an emergency

If ACC disengages unexpectedly, check for sensor blockage first. Clean the radar cover and camera windshield area, restart the vehicle, and try again. For persistent fault warnings, see our Atto 3 dashboard warning lights guide.

Best Practices for Highway Driving

• Use Level 3 or 4 following distance on high-speed roads where sudden lane changes are common
• Do not use ACC in sandstorms. Dust blocks radar and camera detection.
• Keep the windshield clean. Sun glare and sand residue impair camera recognition.
• Avoid ACC through toll plazas. Stationary barriers may not be detected.
• Stay alert near construction zones. Metal plates and temporary barriers confuse radar.

Known Limitations

The BYD Atto 3 owner's manual documents these specific ACC limitations:

• Cannot identify pedestrians or oncoming vehicles
• Cannot reliably detect stationary or slow objects (parked cars, toll booths, cyclists)
• Sharp curves: Vehicle ahead may exit radar detection for several seconds, causing ACC to accelerate
• Adjacent lane vehicles too close to your lane may trigger unnecessary braking
• Rain, fog, and poor visibility require wider following distance settings
• Small targets (bicycles, motorcycles) may not be detected reliably
• Sudden emergency braking by the car ahead may result in late ACC response

ACC assists you but cannot replace your judgment. Keep your hands on the wheel and eyes on the road. Voice commands can adjust climate and media without touching the screen. See our Atto 3 voice control guide for hands-free commands while cruising.

Troubleshooting: ACC Not Activating

1. Check seat belt. ACC requires the driver belt fastened.
2. Check gear. Must be in Drive, not Neutral or Park.
3. Check EPB. Electronic parking brake must be fully released.
4. Check doors. All doors, hood, and boot must be closed.
5. Check for AEB activation. ACC cannot start while AEB is actively intervening.
6. Check speed. Must be below 150 km/h.
7. Check sensor blockage. Clean the front radar cover and camera windshield area.
8. Check for fault icons. ACC fault indicator on the instrument cluster means the system needs dealer attention.
9. Update software. An OTA software update may resolve calibration issues.

Common Mistakes Owners Make

• Using ACC on winding urban roads. ACC is for motorways and open roads only.
• Setting following distance too short. Level 1 gives minimal reaction time. Use Level 3 or 4.
• Taking hands off the wheel with ICC. The system warns and disengages without grip detected.
• Trusting ACC through construction zones. Metal plates and missing markings confuse sensors.
• Assuming ACC handles emergencies. ACC provides limited braking only. AEB handles emergencies separately.