Code Definition

C1124 — Input shaft speed signal missing/faulted

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

About C1124

C1124 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.

C1124 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 input shaft speed sensor, also called the turbine or input speed sensor, measures the rotational speed of the transmission input shaft as it is driven by the torque converter. The control module compares this input speed against engine speed and output shaft speed to calculate gear ratio, manage shift timing, and control torque converter clutch apply. C1124 sets when the module detects that the input shaft speed signal is missing or implausible, such as no signal while the vehicle is clearly moving or a reading that does not agree with the other speed inputs. When this code is set the tran...

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