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What the Writer Says…
CU20 is a DVLA endorsement code for causing or likely to cause danger by reason of use of an unsuitable vehicle or using a vehicle with parts or accessories in a dangerous condition. Importantly, this code specifically excludes brakes, steering, and tyres, which each have their own dedicated conviction codes (CU10 for brakes, CU30 for steering, and CU40 for tyres).
The offence falls under Section 40A of the Road Traffic Act 1988. It covers a broad range of vehicle defects, from faulty lights, mirrors, and exhausts to dangerous modifications, insecure loads, or using a vehicle that is fundamentally unsuitable for its intended purpose on a public road.
– Susan Difford, Insurance Expert &



