C1604 on Hyundai: How to Diagnose & Fix
Manufacturer-Specific Chassis Code (Hyundai/Kia: ECU Hardware Error; Nissan: EPS Torque Sensor)
1 Hyundai model · 1 documented issue · $200-$1,800 repair
C1604 on Hyundai by model: symptoms, diagnosis and fix
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)
C1604 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 C1604 mean on a Hyundai?
C1604 stands for "Manufacturer-Specific Chassis Code (Hyundai/Kia: ECU Hardware Error; Nissan: EPS Torque Sensor)." C1604 is a manufacturer-specific chassis code whose meaning depends on the maker. On Hyundai/Kia it generally indicates an internal ECU/control-module hardware error detected during the module's self-diagnostics (processor, memory, or internal power fault). On Nissan/Infiniti it has been associated with an electric power steering torque sensor fault. Because it disables a safety system (ABS/ESC or electric power steering) as a fail-safe, the affected feature may not work until repaired, so confirm the exact definition for the specific vehicle. On Hyundai it is documented across 1 model: Veloster.
What are the most common causes of C1604?
The most common causes of C1604 are: Internal control module (EBCM/ESC or EPS) hardware fault, Electric power steering torque sensor fault (Nissan/Infiniti), Low or unstable supply voltage to the module, Corroded or loose module connector, Wiring or ground fault, Software/calibration issue requiring update. The specific cause varies by vehicle.
How much does it cost to fix C1604 on a Hyundai?
Published repair estimates on Hyundai range from $200 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C1604 on a different make?
View C1604 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.