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When you manually select gears, this over rides the the selected computer solenoids. Check codes. Replace the shift solenoids and the internal transmission harness.
D4, that is overdrive in a 4 speed automatic. It should go into 4th gear at about 45 mph, although you may not feel it shift. The only reason to use D3 is if you are driving slow, like in city traffic, and the D4 keeps shifting in and out (from 4th to 3rd and back), as if it is "hunting gears". Most people just put it in D4 and drive away.
Do you have an "overdrive" button or shift position? You may need to change that to get the transmission to shift up into D4... or you may simply not be going fast enough to warrant D4.
This light is indicating a fault in the automatic gear box, it can be excessive slippage (you may feel nothing unusual) or other problems. you must have it scanned by a dealer or ****** repair shop to find out what is causing the light to come on.
you have a transmission fault the D4 light blinks to tell you that there is a transmission problem when the light is blinking the transmission computer put the transmission into limp home mode so it will not shift normally and you should try not to drive it very far when it gets to this stage you need to have the transmission codes check to pin point the problem
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