This code indicates an electrical fault in the circuit for the variable effort steering sensor, which adjusts steering assist based on vehicle speed. The system has detected a voltage or signal out of the expected range, which can affect steering feel and handling.
The sensor itself has failed internally and is no longer providing a valid signal to the control module. This is the most common cause of this code.
The wiring harness or connectors leading to the sensor may be chafed, corroded, or have loose pins, causing an open or short circuit.
The sensor is not receiving the proper reference voltage or lacks a good ground connection due to a blown fuse or wiring fault.
The module that interprets the sensor signal may have an internal fault. This is uncommon and should only be considered after all wiring and the sensor test normally.
A failure in the PCM/ECM, which may share vehicle speed data with the steering system, is extremely rare and should be the absolute last component checked.
It is generally safe to drive to a repair location, but steering effort may feel abnormal. The system often defaults to a fail-safe mode, which usually results in heavier steering at low speeds.
No, replacing the PCM or engine computer is almost never the correct fix for C0624. Drivers are frequently told to replace the computer, but the actual cause is almost always the steering sensor itself or a wiring fault.
Variable effort steering relies on vehicle speed data. If the steering module cannot read vehicle speed, it may set a code, but this usually points to a communication or steering sensor circuit fault rather than a wheel speed sensor directly.
C0624 is a chassis code related to steering, not an emissions code. It typically will not cause a vehicle to fail an OBD-II emissions test, though local regulations regarding safety warning lights may vary.