Code Definition

C123F — Steering Wheel Position Sensor Comparative Performance

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

About C123F

C123F is a manufacturer-specific chassis diagnostic trouble code recorded for Jeep vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C123F is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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.

C123F 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 or Electronic Stability Control (ESC) module continuously compares the steering wheel position sensor signal with other vehicle dynamic inputs such as yaw rate, lateral acceleration, individual wheel speed sensors, and the calculated steering angle rate of change. DTC C123F is set when the steering wheel position sensor signal is implausible or fails to correlate with calculated vehicle motion for a calibrated period, indicating a comparative performance fault rather than a complete signal loss. The module flags this code when the geometry described by the steering angle does not match...

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