C0528 indicates that the steering angle sensor (SAS) module is reporting values that are outside its calibrated range or are fluctuating beyond acceptable limits. The power‑train control module (PCM) detects this as a range‑performance fault and stores the code.
The sensor itself may be damaged, have internal short/open circuits, or produce erratic voltage signals that fall outside the calibrated range.
Loose pins, corrosion, or broken wires in the SAS connector can cause intermittent or out‑of‑range signals.
If the SAS was not re‑learned after steering component replacement or after a battery disconnect, the module may report incorrect range data.
A collision or severe bump can misalign the sensor housing, causing it to read angles beyond its design limits.
Only after ruling out sensor, wiring, and calibration issues should a PCM fault be considered, as it is an unlikely root cause.
No. In most cases the PCM is not the problem; the sensor, its wiring, or calibration is far more likely. Replacing the PCM without confirming the other components usually does not resolve the issue.
A battery disconnect may clear the stored code temporarily, but the underlying fault will cause the code to return as soon as the vehicle is driven.
Yes. It provides essential data for stability control, traction control, and steering‑assist systems, so a malfunction can affect vehicle handling and safety.
Usually not. The steering angle sensor is a separate module that can be replaced independently of the steering column, unless physical damage to the column itself is discovered.