transmission trouble for sure
A flashing D4 light indicates a problem with the transmission. It may just need the transmission fluid changed or it may be a more serious problem. I Recommend you seek professional help and do not drive this vehicle until you get the problem repaired or you may do serious damage to the transmission.
A flashing D4 light on Honda Accords is commonly the result of a bad speed sensor. The speed sensor is located on the transmission and sends a signal to the speedometer and a signal telling the transmission when to shift.
The D4 light on a Honda Accord is the transmission warning light. These come on when there is a malfunction on the transmission. For the problem to be diagnosed properly the vehicle should be taken to a dealership.
it means your motor is about too shut down and or is overheating.
There is a problem with the A/T. Seek professional help.
It's the transmission computer.you need to replace it.
Code 12 is a faulty EGR valve. You need to clean or replace the EGR valve of all carbon. The exhaust passage on which the EGR is mounted needs to be cleaned of carbon deposit as well. The flashing D4 light indicates a transmission problem. This needs to be looked at by a professional.
speed sensor is out or is going out. your speedometer is out too right?
Replace your AT Control Unit (Automatic Transmission Computer)
The computer has detected a major problem with that gear or your transmission.Additional Answer:The computer has detected a problem, minor or major, with the transmission, and not necessarily related specifically to D4. This question has been answered multiple other times on Wiki, please search for the question and read other answers.
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