DTC B129A-86: LIN Bus D - Signal invalid: Action

NOTE: This DTC will set if any component on the LIN bus D has failed. To confirm the cause of the fault, each component must be checked individually

Refer to the appropriate system wiring diagrams and disconnect each component on LIN bus D individually, clear the DTC and retest. If no other LIN bus D Diagnostic Trouble Code(s) are set, replace the faulty component as necessary, clear the DTC and retest