Code Definition

C0800 (12) — Control Unit Power Circuit Low Input

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About C0800

C0800 is a generic (obd-ii standard) chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C0800 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

Because C0800 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Electronic Brake Control Module (EBCM) monitors its main power supply circuit to ensure the operating voltage remains within the specified range. DTC C0800 with a low input failure type is set when the EBCM detects that the control unit supply voltage has fallen below the minimum calibrated threshold for a defined period. Because the module relies on stable battery voltage to drive the ABS pump, solenoid valves, and internal processor, this condition can occur during ignition ON, engine cranking, or while driving under high electrical load. When the supply is too low the EBCM disables ABS,...

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