Code Definition

C1224 — Lamp Brake Warning Output Circuit Open

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

About C1224

C1224 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1224 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

C1224 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 Brake Control Module (EBCM) monitors the integrity of the brake warning lamp output circuit by sensing the voltage state on its lamp driver pin. DTC C1224 sets specifically when the module detects an open condition in this circuit, meaning continuity has been lost between the module output and the brake warning indicator in the instrument cluster. The module typically identifies the open by measuring an unexpected voltage state when commanding the lamp or by detecting no current draw. When this code is active, the brake warning lamp will fail to illuminate when commanded, leavin...

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