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Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
have any drivability issue ,transmission not shifting up ,or stuck in one gear like 3rd (limp mode)
The P1618 is a code for volvo codes ECM-530D.
This diagnostic trouble code indicates there are one or more emission-related diagnostic trouble codes stored in the automatic transmission control module (TCM). Diagnostic trouble code (P1618) ECM-530D is stored if this control module requests that the engine management system lights the malfunction indicator lamp (MIL).
Substitute ValuenonePossible Sourceone or more diagnostic trouble codes (DTCs) stored in automatic transmission control module.Fault Symptom[s]varies depending on which diagnostic trouble code (DTC) has been storedSo you need to find out what code is stored in the transmission control module, remedy that and then clear all the codes.
What this all means is you need a good top scan tool ,(not a code reader) to check for TCM (Transmission ) malfunction codes .
You will have to check an Indy shop specializing in Volvo's. or a Volvo Dealer .
Need further assistance with this issue then please get back to me with the reply box below .After rating there is no further cost for any other question relating this issue .Kind regards Greg