Diagnostic Aids
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
When this DTC sets, steering assist is unaffected during the current drive cycle. During the next drive cycle, the EPAS system enters a reduced assist mode.
When this DTC is set, the PSCM sends a message to the IPC to display POWER STEERING ASSIST FAULT in the message center.
DTC U0121:xx indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN, the PSCM wiring harness or an ABS module concern.
Do not install a new PSCM as part of the repair for a PSCM DTC U0121:xx.
| Failure | Action |
|---|---|
| 00 | GO to PINPOINT TEST AJ |
| 02 | GO to PINPOINT TEST AJ |
| 87 | GO to PINPOINT TEST AJ |
| 08 | GO to PINPOINT TEST AJ |