Failure Modes

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

When a DTC is present in the PSCM, the EPAS enters 1 of 2 modes of operation.

Limp Home Mode - The EPAS enters a limp home mode when an internal failure occurs but operation on a backup system is possible. This failure mode gives the steering operation a heavier than normal feel in all driving conditions. A warning message is illuminated in the message center indicating a potential EPAS concern.

Reduced Steering Assist Mode - The EPAS enters a reduced steering assist mode to protect the internal components of the EPAS when a non-critical safety concern is detected by the PSCM, concerns such as low battery voltage, high battery voltage or over-temperature are considered non-critical safety concerns. This reduced steering assist mode gives the steering operation a heavier than normal feel.

Manual Steering Mode - The EPAS enters a manual steering mode (no electrical steering assistance is provided) when a concern considered to be a critical safety concern is detected. In manual steering mode, the vehicle has mechanical steering only which gives the steering operation a heavy feel.