DTC U1A24-87: MOST Ring Complete. No Communication - Missing message: Action

NOTE: This DTC may be stored even though no fault condition is present and should be ignored unless the customer has reported an information and entertainment system concern. Clear the DTC and retest. Verify the customer concern prior to diagnosis

Refer to the appropriate system wiring diagrams and check the MOST ring for fault, bypass each MOST module in turn to isolate faulty node