Code Definition

C1233 — Speed Wheel LF Input Signal Missing

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

About C1233

C1233 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.

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.

C1233 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 ABS module monitors each wheel speed sensor to manage braking, traction control, and stability control functions. DTC C1233 sets when the ABS module does not detect a signal from the Left Front (LF) wheel speed sensor while the vehicle is moving above the diagnostic threshold speed, typically around 8 to 16 km/h. The wheel speed sensor reads a toothed or magnetic tone ring on the wheel hub or axle and produces a frequency proportional to wheel rotation. When this code is set, the ABS, traction control, and stability control warning lamps usually illuminate and these systems are disabled un...

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