Code Definition

C1155 — Speed Wheel Sensor LF Input Circuit Failure

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

About C1155

C1155 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1155 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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.

C1155 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 control module monitors each wheel speed sensor input circuit for proper signal and electrical integrity. DTC C1155 sets when the module detects a fault in the left front (LF) wheel speed sensor input circuit, such as a loss of signal, an out of range reading, or an open or shorted circuit that prevents a valid wheel speed from being received. The sensor generates a signal as the tone ring teeth pass its tip, and the module uses this to calculate left front wheel speed for ABS, traction control, and stability control. When this code sets, those systems are typically disabled and their ...

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