Year-to-date, the overall market is down 4.6% on 2016 levels, with 2,224,603 cars registered in the first 10 months.
Alex Buttle, from vehicle buying comparison website Motorway.co.uk, said: "Diesel's market share is plummeting and consumers aren't listening to rhetoric about cleaner diesel models, however much the industry drums on about it". Registrations so far in 2017 have dropped by 4.6% compared to the same point in 2016.
As a result of the seemingly terminal decline in diesel vehicle registrations, the SMMT is calling for the government to reassure buyers that there will be no bans, charges or other restrictions place on the latest diesel cars in the future.
Confidence and trust of diesel cars has plummeted since the 2015 "diesel gate" scandal which revealed the true emissions output of these cars.
However, SMMT has claimed that "confusion" over the potential introduction of measures to restrict the use of diesel vehicles in some areas has impacted demand for new diesel cars.
The UK new auto market saw another month of decline - and is down year-on-year - on the back of poor diesel sales.
Diesel sales tumbled by almost 30% in October following the scandal over rigging emissions tests and political rumblings over restrictions on diesel cars.
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The SMMT also cites a lack of confidence as the main reason for the decline, although we'd have thought the fact that the auto industry's push to get us all in to new cars with fancy lease deals has now crested the hill plays a big part too.
"In the longer term this correction in sales is positive for the market, and should reduce concerns of new vehicle oversupply impacting negatively on used-car values".
"Looking beyond that the uncertainties still facing the UK economy make it hard to make a robust forecast for 2018 as a whole, however the determinants such as UK GDP and employment levels remain robust".
However, AFV's increasing market share couldn't offset the decline in diesel registrations, which fell by -29.9% in October - the most noticeable drop yet.
General uncertainty is making businesses and consumers reluctant to make buying decisions, according to Andy Hartley, commercial director at Lex Autolease.
"Confidence in new, cleaner diesel vehicles must be restored and consumers need to understand that no town or city has plans to charge Euro 6 diesels to enter".
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