Golf MK5 TDI GT non start, no crank, no dash lights

Hi all,

I have a 2008 Golf Mk5 TDI GT SPORT 2.0 litre and recently it started cutting out while running and then wouldn't start, no crank, no lights on dash, nothing, but lights, stereo etc still works. Then after 10 minutes or so it would start again and run for sporadic amounts of time before cutting out again. I took it to the garage who replaced the main voltage relay, the speedo & the ignition switch which seemed to cure the problem only for it to return a few days later and now it doesn't start at all, still no crank or lights on dash, but stereo, lights, windows etc still work.

I plugged it last night and got the following codes, any help on what could be the problem before I go back to the garage and pay out more money to not solve it would be massively appreciated:
00576 - Terminal 15
00185 - Relay voltage supply Terminal 15 adaption
02402 - Control circuit for Terminal 15 for interior
00466 - Steering Column electronic systems control module J527
01321 - Control unit for airbag - J234
02403 - Terminal 15 for interior
01314 - Engine control unit
01064 - Terminal 58d interior light dimmer
Thanks in advance
Sam

I would delete all of the DTC's and start anew. The garage maybe did not do this. Do they have VCDS?

I'm not sure, they are a VW specialist so I would assume so. I will try deleting all the DTC's and see what happens.

Thanks