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Theres a transmission cooling sensor and somtimes the wire comes loose from other repairs being done around it. or its just out. its on the left side sitting on the tranny. THATS WHY your d4 light is blinking
possibly due to low trans fluid pressure. the cooler in the radiator
may be plugged. to check, disconnect and bypass cooler with rubber line
& clamps. drive 2-3 miles. shifting OK now? install auxillary
cooler to bypass one in radiator. you can get one at auto-zone $30-$50.
may just need fluid & filter change, but more likely it's the
cooler. when they get plugged, either one, pressure drops alot.