The Local Government Association (LGA) is calling for the UK to retain a proposed EU ban on companies that provide mileage "correction" for cars, the BBC reports.
The association is also calling for the ban to be brought forward and for mileage correction devices to be banned from sale.
Clocking is when a car's mileage dashboard display is decreased and recent figures reveal the practice increased by 10% between March and October last year.
While it is fraud to sell a car you know has been clocked without disclosing that its odometer has been adjusted, a legal loophole currently exists meaning it is not actually illegal to alter a car's mileage.
The LGA has warned that adjusting the mileage can result in artificially increased car prices as cars with lower mileage are more expensive.
Clocking could also hide serious mechanical problems on vehicles. The more miles a vehicle has done, the more wear and tear it will have suffered and this increases the chances of mechanical issues.
Chairman of the LGA's Safer and Stronger Communities Board, Simon Blackburn, said: "With up to 1.7 million clocked and potentially dangerous vehicles on UK roads, anyone buying a second-hand car should make as many checks as they can to ensure that the vehicle is showing its true mileage."
Blackburn noted that clocking is harming reputable used car dealers as well as consumers.
He also warned that clocking would continue to increase without the introduction of the ban under UK law.
Do you think the ban should be imposed?