C1604 on Kia
Manufacturer-Specific Chassis Code (Hyundai/Kia: ECU Hardware Error; Nissan: EPS Torque Sensor)
C1604 on Kia vehicles indicates manufacturer-specific chassis code (hyundai/kia: ecu hardware error; nissan: eps torque sensor). Au7o has documented this code across 3 Kia models — most commonly on Rio, Seltos, Soul. 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 Kia range from $120 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 Kia by Model
Kia Rio(1 issue)
- Forward Collision-Avoidance Assist / AEB Warning Light and False Alerts2021-2023
Rio owners have reported Forward Collision-Avoidance Assist warnings, disabled AEB/FCA messages, and occasional false collision alerts even in normal driving. Problems are often linked to the front camera or radar alignment, windshield replacement, sensor obstruction, or software sensitivity. Because the system is part of the active safety suite, repeated faults reduce driver-assistance functionality and can create uncertainty about whether emergency braking is available.
Kia Seltos(1 issue)
- EPS Warning Light with DTC C160404 — Electric Power Steering Control Unit Self-Test Fault2021
On early-build 2021 Seltos (SP2) the Electric Power Steering module logs DTC C160404 during its start-up diagnostic self-check and illuminates the steering warning light. In most cases the hardware is fine — the module's judgment logic is over-sensitive during the power-up check, particularly when battery voltage sags at cranking. Kia addressed it with bulletin CHA110 / campaign SA466, an EPS ECU reflash titled 'SP2 EPS MIL ON DTC (C160404) JUDGMENT LOGIC IMPROVEMENT'. Because the fault can appear as a hard warning light, owners are frequently quoted a full EPS rack replacement when a reflash is the actual repair.
Kia Soul(1 issue)
- ABS/HECU Module Brake-Fluid Leak Causing Engine Compartment Fire2011-2013
The Hydraulic Electronic Control Unit (HECU/ABS module) can develop an internal electrical short (fluid leakage plus localized PCB melting was found in retrieved units), producing excessive current that can cause an engine-compartment fire while parked or driving. NHTSA recall 23V-652 covers 349,309 2011-2013 Souls equipped with Electronic Stability Control, part of the broader Kia/Hyundai 'park outside' fire-risk campaign. Owners were told to park outside and away from structures until repaired.
Looking for C1604 on a different make?
View C1604 across all makes →Frequently Asked Questions
What does C1604 mean on Kia?▼
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 Kia specifically, this code is documented across 3 models.
What causes C1604 on Kia vehicles?▼
Common causes on Kia: 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 Kia?▼
Repair costs on Kia range from $120 to $1,800, depending on the specific model and root cause.
Which Kia models have C1604 documented?▼
Au7o has documented C1604 on 3 Kia models: Rio, Seltos, Soul.