Aon research has shown that four out of five DC pension scheme members are not saving enough money.
It said DC scheme members are overall saving £11.4bn less each year than they need to maintain living standards in retirement, the equivalent of £1,400 per year each.
Aon found that only 16% of DC scheme contributors saved a sufficient sum.
Responses from more than 2,000 DC scheme members revealed an "enormous disconnect between scheme members' current expectations and the reality of pension saving", Aon noted.
Extrapolating the sample to the whole DC scheme population - estimated at 8.1m people - the results showed:
* 2.75m did not know the level of retirement income they expected to receive
* Half would not have saved enough at retirement to maintain their standard of living
* A quarter had no idea of the income needed to maintain their standard of living
* More people are saving into schemes, but many new joiners pay the lowest auto-enrolment rates.
Aon partner and head of DC consulting, Sophia Singleton said: "Auto-enrolment has successfully increased participation in pension schemes, but the vital next step is to ensure that these new entrants save a sufficient amount for retirement.
"We still see that members look to their employers for guidance. The trust that is placed in them when it comes to pension savings, means that there is a real responsibility to provide adequate and clear communications in order to improve member engagement and contribution levels."