Perhaps someone should look or post the question on Pistonheads forum?I just checked a 2008 C6 and a 2019 C7, both of which should I think be exempt, but the checker says neither is. So it seems that imports are automatically not exempt until you prove that they are. So it seems you need to get some sort of emissions data from Chevrolet, but how one does that I do not know!
I get the impression TFL dont know whats compliant and whats not ,( the list of compliant vehicles is being refined and updated) best to check often to avoid a penalty charge ........as an aside , a friends TVR was listed as no ULEZ charge but when he checked again some months later its now not compliant so incurs the chargeIt'll be interesting to see if there is a 'cut-off' date for this - my understanding is that it's 2006 but I've seen for 2005 (UK/Euro supplied) vehicles that are covered.
TFL and the London Mayor are crosses we Londoners have to bareMy recent plug-in hybrid daily driver was below 50co and therefore congestion charge exempt. I registered it with TFL for a £10 annual fee, sending them a copy of manufacturers conformity certificate - early in the third year of ownership (this year) TFL started charging every time I went in to central London. Fortunately I hadn't cancelled my old credit card account with them........implications otherwise would have been a whole series of fines. Interestingly they have no 'mechanism' for wrongly applied charges that are not reported within 14 days. It took 3 or 4 months to get the issues resolved - fortunately owning to Covid and being furloughed I wasn't actually going in to the charge zone very often. TFL is a top heavy, grossly mismanaged organisation with a third world grade website. Did you know the administrative side of their 'business' is not even in London - its oop' north somewhere!