It is apparently a fault which has cleared. I suggest you get a scan done to see if there is an underlying issue. Do you have access to VCDS, if not I suggest you invest in a copy. The best under $500 spend you will ever make.

Stuart..

 

The 3.0 tdi is a super complex motor with hundreds of fault codes that can trigger a single warning lamp. No offense but it sounds like you are not that experienced in diagnostics or repairs, if I were you I would bring it to a VW dealership and have it professionally diagnosed, you should have a 5 year 60k mile powertrain warranty provided your in North America.

It is apparently a fault which has cleared. I suggest you get a scan done to see if there is an underlying issue. Do you have access to VCDS, if not I suggest you invest in a copy. The best under $500 spend you will ever make.

Stuart..

Sent from my SAMSUNG-SM-G920A using Tapatalk

 

I believe you're describing the glow plug indicator.

I believe it flashing is an indicator for the DPF being "full"

Go take it for a long highway drive and see what happens.

 

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I believe it flashing is an indicator for the DPF being "full"
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DPF fault is one of many possible issues which could cause this indication. In general, if a fault occurs, it is recorded in the ECU memory (even if it clears later). If the light is steady, it is a warning of an issue. If it is flashing it usually means immediate attention is required.
All of these are known collectively as MIL [Malfunction Indicator Lights] and each system in the car has symbols unique to that system. The engine related systems are usually shown by the double loop 'glo plug' symbol.