Code Definition

C1191 — Speed Wheel Sensor LF Input Short Circuit To Ground

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

About C1191

C1191 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 C1191 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

C1191 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

This chassis code relates to the left front wheel speed sensor circuit, which the ABS control module uses to measure individual wheel rotation for anti lock, traction, and stability control. DTC C1191 sets when the module detects the left front sensor input shorted to ground, meaning the signal line is held at ground rather than producing a varying wheel speed signal. Active wheel speed sensors operate on a sensor supply and ground with the signal returning a low level current or voltage that changes with rotation, so a short to ground collapses that signal and the module loses the speed readi...

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