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Remove the lower steering column cover and try to find the shift interlock solenoid. Check to see if there is power to it when the brake pedal is pressed. You should also have power at the gray and yellow wire with the key on as well. Also, connect your test light to a power source and test the ground circuit. If these test OK the the fault is in the solenoid. If it needs a solenoid, I don't think it is service separately from the steering column. I just replaced one of these a few weeks ago for a broken shift lever housing and there was nothing available separately. Just to be on the safe side, when you have the lower steering cover off, disconnect the shift cable and make sure that it moves freely. Make sure to put the brake on so it doesn't roll on you.