D4 light blinking

This is a fault code in the trans. One solution is ti disconnect tge bsttery fir 10 to 15 minutes this will reset the trans. Control unit. If thus does not work it could need a rebuild.

Usually it means the speed sensor in the transmission is failing.
The blinking light means your overdrive may not work.

If the TCS light is on and the D4 light is blinking, this indicates that there is a transmission control problem. You must scan your onboard computer network fo fault codes to begin diagnosis.

The D4 light is coming on to tell you that there is one or more fault codes set in your transmission control module. The only way to retrieve codes on the 1995 models is to read "Flash Codes" output by the D4 light. (See instructions below)

RETRIEVING FLASH CODES USING THE D4 LIGHT
If fault codes are present, the D4 light will "blink" when the ignition is turned to the RUN position and will remain on at all times when the engine is running.
To retrieve the flash codes, turn the ignition switch off.
Install a jumper wire between the service check connector terminals.
The service check connector is a gray, 2-pin connector located on the PCM/TCM cover under the passenger side of the instrument panel. (See picture below)

CAUTION: DO NOT use the 3-pin located next to the service check connector.

Installing the jumper will place the PCM/TCM in diagnostic test mode.
Turn the ignition to the RUN position. Codes will be output by blinking the D4 light.
Note the number of blinks from the D4 light. A short blink indicates a single digit flash code. A long blink equals 10 short blinks. For instance one short blink indicates code 1. One long blink and four short blinks indicates code 14. If there is more than one fault code, they will be output one at a time from the lowest numbered code to the highest numbered code. It is recommended that you read the code or codes several times to make sure that you are reading it correctly.

Once you have retrieved the fault code(s) re-post your question and include the information for what codes you have and someone can then help you locate the cause of the problem.

change shift solenoid and the d4 blinking will go

The blinking D4 light indicates a transmission problem. If someone installed the trans and engine for you, bring it back to them to determine what the problem is, as it should be under some type of warranty hopefully. If you did the swap yourself, I would scan for codes (free service at parts stores) to see if any come up. Last, you could try disconnecting the neg. battery cable for about 10 minutes, reconnect, which should reset the computer and the light should go off. If it comes back on, there is some kind of problem still.

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

this indicate a transm. failure, begin to check fluid transm. level.

why does the d4 light start to blink and it doesnt stop even if you put it in park?

The D4 light blinking is the vehicle computer telling you there is a transmission malfunction and transmission codes are stored in the computer's memory.The codes have to be pulled out manually unless it has an OBD2 connector.A transmission shop or Honda dealer can pull the codes.