MOT failure rate and common problems for the Gm Hummer, and how to check your own car by registration.

Updated 05 September 2026.

19.0%fail rate

Gm Hummer MOT failure rate

What a Gm Hummer fails its MOT on, and the part that fixes each.

What it fails on, and why

Lamps & electrical63.6% of failures

Lighting is the single most common MOT failure and the cheapest to put right. A blown headlight, brake-light or number-plate bulb, a cracked lens, or a headlamp beam that points too high or low will all fail. Most are a two-minute bulb swap.

Exhaust & emissions36.4% of failures

Exhaust failures cover leaks, insecure mountings and emissions over the limit. A blowing exhaust, a failed lambda reading or a diesel that smokes beyond the limit will fail.

Brakes27.3% of failures

Brake failures cover worn pads and discs, an imbalance between wheels, corroded or scored discs, or a binding caliper. Braking efficiency is measured on a rolling road, so a spongy or pulling brake shows up as a low reading.

Seat belts27.3% of failures

Seat-belt failures are frays, cuts, corroded anchorages, or a belt that will not lock under a sharp pull or retract properly.

Other18.2% of failures

This covers a range of smaller items, from a non-working horn to a warning light left on.

Steering9.1% of failures

Steering faults are typically worn track-rod ends or ball joints, play in the rack, or a split gaiter letting grease out and dirt in. Excessive free play at the wheel fails.

The parts that fix each

If your car has just failed, you have 10 working days to fix the items and get a free partial retest. Confirm the exact fitment against your registration or VIN before buying.

For the lamps & electrical failure: Gm Hummer headlight and indicator bulbsShop Gm Hummer headlight and indicator bulbs on Amazonaffiliate Find Gm Hummer headlight and indicator bulbs on eBayaffiliate

For the exhaust & emissions failure: Gm Hummer exhaustShop Gm Hummer exhaust on Amazonaffiliate Find Gm Hummer exhaust on eBayaffiliate

For the brakes failure: Gm Hummer brake pads and discsShop Gm Hummer brake pads and discs on Amazonaffiliate Find Gm Hummer brake pads and discs on eBayaffiliate

For the seat belts failure: Gm Hummer seat beltsShop Gm Hummer seat belts on Amazonaffiliate Find Gm Hummer seat belts on eBayaffiliate

For the steering failure: Gm Hummer steering track rod endsShop Gm Hummer steering track rod ends on Amazonaffiliate Find Gm Hummer steering track rod ends on eBayaffiliate

Other models

Ford Fiesta MOT failures27.1% failure rate Ford Focus MOT failures26.1% failure rate Vauxhall Corsa MOT failures29.9% failure rate Vauxhall Astra MOT failures28.0% failure rate

Questions and answers

What is the MOT failure rate of the Gm Hummer?

It fails 19.0% of its MOT tests across the DVSA record, from 58 tests.

What do these cars fail their MOT on most?

The most common failure area is lamps & electrical, at 63.6% of this model's failures.