Code Definition

C1223 — Lamp Brake Warning Output Circuit Failure

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

About C1223

C1223 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 C1223 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1223 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) commands the brake warning indicator lamp in the instrument cluster on and off through a dedicated lamp driver output circuit. DTC C1223 sets when the module detects an electrical fault on this output circuit, such as an open circuit, short to ground, or short to battery voltage. The brake warning lamp is a critical driver notification used to indicate low brake fluid, parking brake engagement, ABS faults, or hydraulic pressure imbalance. When this code is active, the brake warning lamp may fail to illuminate when needed, remain illuminated continuous...

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