DTC C1D01-64: Park Brake Release Switch - Signal plausibility failure: Action

NOTE: This DTC may be set due to resting of an object (e. g hand) on the switch with only a light pressure

Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check switch circuits for short circuit to ground, short circuit to power, open circuit, high resistance. Repair circuit as required. Clear DTC and retest
If fault persists, check and install a new electric park brake switch as required