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Holden Calais warning light

The transmission warning light on my VZ Holden Calais comes on, seemingly at random. My mechanic has checked the system and says that all is ok, and when I turn the ignition on without starting the vehicle the system check comes up ok, but the light still comes on at times. Any thoughts on what the cause might be? I am about to have the transmission serviced with a change of oil to see if this corrects the problem.

If the transmission is performing as it should then it could just be a dodgy wiring connection, but having the transmission checked and serviced is a wise course of action.

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