Adaptive Cruise Control Sensor Alignment
2018-2018 Lincoln MKX 3.7L V6
The 2018 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed c0400 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The adaptive cruise control distance sensor is out of calibrated alignment.
Symptoms
- ACC unavailable message
- ACC warning light
- Cruise control not functioning
- Forward collision warning inactive
Common Causes
- Sensor misaligned after collision
- Sensor bracket bent
- Windshield replacement shifted sensor
- Front fascia repair changed sensor aim
Diagnostic Steps
- Perform ACC sensor alignment procedure
- Check sensor mounting bracket
- Inspect front fascia for damage or misalignment
- Verify sensor aim with manufacturer target and procedure
- Check for windshield-related codes if camera-based
Repair Notes
Perform ACC sensor alignment using manufacturer-specified targets and procedure.
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
C0400 on Other Vehicles
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2020-2020 3.0L Twin-Turbo V6
Lincoln Aviator
2020-2020 3.0L V6 Twin Turbo
Lincoln Aviator
2020-2020 3.0L V6 Twin Turbo Hybrid
Lincoln Aviator
2021-2021 3.0L Twin-Turbo V6
Lincoln Aviator
2021-2021 3.0L V6 Twin Turbo
Lincoln Aviator
2021-2021 3.0L V6 Twin Turbo Hybrid
Lincoln Aviator
2022-2022 3.0L Twin-Turbo V6
Lincoln Aviator
2022-2022 3.0L V6 Twin Turbo
Common Questions
What does code C0400 mean on a 2018-2018 Lincoln MKX?
C0400 stands for "Adaptive Cruise Control Sensor Alignment". The adaptive cruise control distance sensor is out of calibrated alignment.
What are the symptoms of C0400 on a Lincoln MKX?
Common symptoms of C0400 include: ACC unavailable message, ACC warning light, Cruise control not functioning, Forward collision warning inactive.
What causes C0400 on a 2018-2018 Lincoln MKX?
Common causes of C0400 include: Sensor misaligned after collision, Sensor bracket bent, Windshield replacement shifted sensor, Front fascia repair changed sensor aim.
Last updated: March 2026