C1620 on 2019-2021 Hyundai Veloster — Active Yaw / Stability Control System Fault
1 vehicles · 1 makes · $200-$1,800 repair
How to diagnose and fix C1620: most-reported vehicles
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Hyundai Veloster · 2019–2021
Owners have documented intermittent failures of the forward collision warning, lane-keeping, and related ADAS functions, including dashboard messages that the front camera or safety systems are unavailable. Some complaints involve false alerts in clear weather, while others describe the systems disabling themselves after startup or while driving. These issues are often linked to camera alignment, sensor contamination, software logic, or wiring/connectivity problems rather than a mechanical brake fault.
Common Symptoms
- forward collision warning unavailable
- lane keep assist unavailable
- false collision alerts
- ADAS warning lights on cluster
- system disables itself while driving
How to Fix
Scan ADAS modules for camera/radar communication or calibration faults, inspect the windshield camera mounting area and front sensor surfaces, and verify no aftermarket windshield work altered alignment. Hyundai service procedures generally involve software checks, connector inspection, and camera/radar recalibration or replacement if faults persist. If the windshield has been replaced, proper OEM-spec calibration is critical.
Sources for this issue (1)
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C1620 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1620 mean?
C1620 stands for "Active Yaw / Stability Control System Fault." C1620 is a manufacturer-specific chassis code (documented on Mitsubishi) associated with the Active Yaw Control / stability control system. That system manages torque distribution and braking inputs to keep the vehicle stable during cornering and on slippery surfaces. When the module detects a fault in this circuit or a related sensor, it disables active yaw/stability control and illuminates the ABS and stability warning lights. Exact meaning varies by maker, so verify against the factory service manual.
What are the most common causes of C1620?
The most common causes of C1620 are: Faulty yaw rate sensor, Fault in the active yaw control hydraulic/actuator unit, Damaged wiring or connectors in the system, Related wheel speed or steering angle sensor fault, Low system voltage or poor ground, Stability control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1620?
Repair costs for C1620 range from $200 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1620?
Au7o has documented C1620 across 1 vehicle models from 1 manufacturers: Hyundai.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.