Code Definition

C1604 — ECU Hardware Error

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Hyundai

About C1604

C1604 is a manufacturer-specific chassis diagnostic trouble code recorded for Hyundai vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1604 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Electronic Stability Program (ESP) or Electronic Brake Control Module (EBCM) performs continuous internal self diagnostics to verify correct operation of its processor, memory, power supply, and internal circuitry. DTC C1604 is set when the module detects an internal hardware malfunction that cannot be attributed to external sensor inputs or wiring, such as processor faults, memory errors, or internal power regulation failures. When this fault is present, ESP functions are disabled as a fail safe measure. The ABS, ESP, and traction control warning lamps will usually illuminate and the rela...

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