Arrange the steamer trivet in the bottom of Instant Pot. Add 1 cup of the water in Instant Pot. Arrange the cod fillets in Instant Pot.
Next, secure the lid and cook under “Manual” and “High Pressure” for about 2 minutes. Select “Cancel” and carefully do a quick release.
Remove the lid and add the peas in the steamer trivet with cod. Next, secure the lid and cook under “Manual” and “High Pressure” for about 2 minutes. Select “Cancel” and carefully do a quick release.
Meanwhile in a food processor, add remaining ingredients and pulse till smooth.
Transfer the sour cream mixture into a bowl. Add cod and peas and stir to combine.