Flashing "D" light whilst driving.

[mark666]

Hi all. I have an intermittent fault on my 2015 CRV diesel auto in that over time, the D drive light flashes for a while which sometimes makes shifting harsh and moving off pretty sluggish. It also stops reverse selecting unless i switch off and restart. Reading the codes, it says code )0974, P0977, P0980 and P0983 which are the 4 drive solenoids all going to open circuit. The odd thing is, any one of the codes can occur first then if I continue to drive, the rest of the codes will randomly show up.
All this leads me to think it is a problem with the harness but I have checked all the connections on the gearbox with no apparent problems so perhaps it is at another junction. Does anyone know where the ECU for the auto box is and are there any other junctions, perhaps at the bulkhead. I have had a look but it isn't at all clear.
Thanks, Mark.

[Trevor]

There seems to be some info on these codes and faults with this transmission on a Google search and used in Toyota as well as other Japanese brands