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.
DTC U0001:88 indicates a failure of the HS-CAN which can be due to a circuit failure in the HS-CAN or the PSCM wiring harness.
When this DTC is set, steering assist is reduced but not removed.