Adaptive Cruise Control (Acc)

NOTE: The ACC system is cancelled when the VSA system is activated.

Symptom	Diagnostic procedure	Also check for
Vehicle speed can be set, but there is no ACC indication on the MID	Do the gauge control module self-diagnostic function - Refer to: Gauges Self-Diagnostic Function (2016 2017 2018) or Gauges Self-Diagnostic Function (2019 2020 2021) .
ACC OFF is displayed on the MID unexpectedly	Check the ACC system auto stop control history - Refer to: Troubleshoot the Adaptive Cruise Control (ACC) (2016 2017 2018) How to Troubleshoot the Adaptive Cruise Control (ACC) (2019 2020 2021) .
Vehicle speed cannot be set when the SET switch is pressed (USA models: between the 25 mph (40 km/h) and 90 mph (145 km/h), Mexico model: between the 19 mph (30 km/h) and 112 mph (180 km/h))	1. Test the ACC combination switch - Refer to: Test (2016 2017 2018) or Test (2019 2020 2021) . 2. Test the Brake Pedal Position Switch .	An open in the wire. A short in the wire. The system is in service mode.
Vehicle does not decelerate or accelerate accordingly when the SET or RESUME switch is pressed	Test the ACC combination switch - Refer to: Test (2016 2017 2018) or Test (2019 2020 2021) .	An open in the wire.
Set speed does not cancel when the brake pedal is pressed	Test the Brake Pedal Position Switch .	An open in the wire.
Set speed does not cancel when the MAIN switch is turned off	Test the ACC combination switch - Refer to: Test (2016 2017 2018) or Test (2019 2020 2021) .	An open in the wire.
Set distance cannot be adjusted with the distance switch	Test the ACC combination switch - Refer to: Test (2016 2017 2018) or Test (2019 2020 2021) .
Vehicle speed can be set, but vehicle decelerates	Check for DTCs in the PGM-FI system with the HDS - Refer to: F-CAN Circuit Troubleshooting (6-Speed A/T) (2016 2017 2018) or F-CAN Circuit Troubleshooting (9-Speed A/T) (2016 2017 2018) or F-CAN Circuit Troubleshooting (6-Speed A/T) (2019 2020) or F-CAN Circuit Troubleshooting (9-Speed A/T) (2019 2020 2021) .	Faulty ETCS.
Senses a vehicle driving in another lane	Symptom troubleshooting. Go to:Senses A Vehicle Driving In Another Lane .	Incorrect millimeter wave radar installation. Wheel alignment.
Does not sense the vehicle driving ahead	Symptom troubleshooting. Go to:Does Not Sense The Vehicle Driving Ahead .	Out of the performance limits. Wheel alignment. Undetectable environment.
Intermittently senses the vehicle driving ahead	Symptom troubleshooting. Go to:Intermittently Senses The Vehicle Driving Ahead .	Incorrect millimeter wave radar installation. Wheel alignment. Undetectable environment.
ACC indicator does not come on	Symptom troubleshooting. Go to: ACC Indicator Does Not Come On (Without Auto Idle Stop System) (2016 2017 2018) .
ACC indicator does not go off	Symptom troubleshooting. Go to: ACC Indicator Does Not Go Off (With Auto Idle Stop System) (2016 2017 2018) .
ACC activation indicator does not come on	Symptom troubleshooting. Go to:ACC Activation Indicator Does Not Come On (2016 2017 2018) .
ACC activation indicator does not go off	Symptom troubleshooting. Go to: ACC Activation Indicator Does Not Go Off (2016 2017 2018) .