C1604 on Hyundai
Manufacturer-Specific Chassis Code (Hyundai/Kia: ECU Hardware Error; Nissan: EPS Torque Sensor)
C1604 on Hyundai vehicles indicates manufacturer-specific chassis code (hyundai/kia: ecu hardware error; nissan: eps torque sensor). Au7o has documented this code across 3 Hyundai models — most commonly on Accent, Elantra, Veloster. 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. Typical repair costs on Hyundai range from $80 to $1,800, depending on the specific model and root cause.
Common Causes of C1604
- •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
C1604 on Hyundai by Model
Hyundai Accent(1 issue)
- ABS/HECU Brake-Fluid Leak Causing Engine-Compartment Fire (Recall 23V-651 / Campaign 251)2012-2015
O-ring material inside the ABS Hydraulic Electronic Control Unit (HECU) can degrade and allow brake fluid to leak internally, causing an electrical short and overcurrent that can ignite an engine-compartment fire while parked or driving, even with the ignition off. NHTSA recall 23V-651000 covers 240,589 model-year 2012-2015 Accents (part of the larger ~1.6M-vehicle Hyundai action). Warning signs include smoke/burning odor from the engine bay and MIL/ABS light illumination.
Hyundai Elantra(1 issue)
- MDPS Rubber Coupler Wear — Steering Clunk / Knock and Loss of Assist2011-2016
The Motor Driven Power Steering (MDPS) unit uses a flexible rubber coupling between the assist motor and the steering column. The rubber isolator wears, cracks, or develops play, producing a distinct clicking, clunking, or thud through the wheel during low-speed turns and on rough pavement. In more advanced cases an MDPS fault (motor circuit or steering angle sensor) can illuminate the EPS warning light and cause heavy/lost power-steering assist. Hyundai issued TSB 14-ST-002-1 covering the coupler.
Hyundai Veloster(1 issue)
- Forward Collision-Avoidance / Driver Assistance False Warnings and Camera-Radar Malfunctions2019-2021
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.
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View C1604 across all makes →Frequently Asked Questions
What does C1604 mean on 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 specifically, this code is documented across 3 models.
What causes C1604 on Hyundai vehicles?▼
Common causes on Hyundai: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1604 on a Hyundai?▼
Repair costs on Hyundai range from $80 to $1,800, depending on the specific model and root cause.
Which Hyundai models have C1604 documented?▼
Au7o has documented C1604 on 3 Hyundai models: Accent, Elantra, Veloster.