ACC Distance Sensor Circuit
2016-2016 Chevrolet Impala 2.5L I4 Ecotec
The 2016 Chevrolet Impala is equipped with a 2.5L inline-4 engine. Below you'll find detailed c0401 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
General malfunction in the adaptive cruise control distance sensing radar or lidar unit.
Symptoms
- ACC system disabled
- Forward collision alert disabled
- Cruise control limited to non-adaptive mode
- Warning message on dash
Common Causes
- Radar/lidar unit failure
- Sensor blocked by dirt or ice
- Wiring damage to sensor
- Control module failure
Diagnostic Steps
- Clean sensor face (radar cover or camera lens)
- Check for obstructions in front of sensor
- Test sensor power supply
- Inspect wiring and connector
- Perform sensor self-test with scan tool
Repair Notes
Clean sensor area first. Replace radar/lidar unit if internal failure.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0025LF Wheel Speed Sensor Circuit Intermittent
C0401 on Other Vehicles
Chevrolet Avalanche
2010-2010 5.3L V8 Vortec
Chevrolet Avalanche
2010-2010 6.0L V8 Vortec
Chevrolet Avalanche
2011-2011 5.3L V8 Vortec
Chevrolet Avalanche
2011-2011 6.0L V8 Vortec
Chevrolet Avalanche
2012-2012 5.3L V8 Vortec
Chevrolet Avalanche
2012-2012 6.0L V8 Vortec
Chevrolet Avalanche
2013-2013 5.3L V8 Vortec
Chevrolet Avalanche
2013-2013 6.0L V8 Vortec
Common Questions
What does code C0401 mean on a 2016-2016 Chevrolet Impala?
C0401 stands for "ACC Distance Sensor Circuit". General malfunction in the adaptive cruise control distance sensing radar or lidar unit.
What are the symptoms of C0401 on a Chevrolet Impala?
Common symptoms of C0401 include: ACC system disabled, Forward collision alert disabled, Cruise control limited to non-adaptive mode, Warning message on dash.
What causes C0401 on a 2016-2016 Chevrolet Impala?
Common causes of C0401 include: Radar/lidar unit failure, Sensor blocked by dirt or ice, Wiring damage to sensor, Control module failure.
Last updated: March 2026
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