Disconnect the battery for 10 minuts then reconnect it, do not use any settings saving devices for they will also save the settings stored in the recent memory of the computer where the service codes are stored.
Beyond the flippant reply of "get it serviced" try the folliwing:
With ignition off press and hold trip reset.
Still holding, turn ignition on.
Let go then twiddle clock adjuster knob left and right.
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