# Trailer brake lights not working at all. — Vehicle inspection defect categories: MOT major, minor and dangerous verdicts

For Trailer brake lights not working at all., defect is Trailer brake lights not working at all; category is Dangerous; inspection item number is 4.10; defect reference is (c); inspection item is Electrical connections between towing vehicle and trailer or semi-trailer, recorded from its source on 2026-08-06.

- **Defect:** Trailer brake lights not working at all. _(verified: appears in the quote below)_
- **Category:** Dangerous
- **Inspection item number:** 4.10
- **Defect reference:** (c) _(verified: appears in the quote below)_
- **Inspection item:** Electrical connections between towing vehicle and trailer or semi-trailer _(verified: appears in the quote below)_
- **Authority:** EU Directive 2014/45/EU Annex I _(our reading, not quoted from the source)_

## What the source says

> (c) | Trailer or towing vehicle electrical connections not functioning correctly. Trailer brake lights not working at all. | | | X | X

## Source

- https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32014L0045

Last verified: 2026-08-06. Review by: 2027-02-02.
Part of [Vehicle inspection defect categories: MOT major, minor and dangerous verdicts](https://referencesource.org/vehicle-inspection-defect-categories/).