At a Glance
The Triumph Gt6 has 22 identified common problems across 1 generation, with the GT6 (1966-1973) being the most affected generation and brakes the most common problem category. Based on 13K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on a specific model than the UK average — confirmed at 99% statistical confidence. Read our DVSA MOT data methodology →
Below: generation-by-generation comparison of Triumph Gt6 common problems, MOT failure types, and pass-rate data drawn from DVSA records. Click any generation to see fuel- and engine-specific fault patterns, mileage-banded repair guidance, and the most common MOT failures testers record.
MOT Tests & Failures by Generation
Triumph Gt6 generations by MOT tests, failures, and identified problems from DVSA data
Hover over each bar for a full breakdown. Tap any bar to view that generation's problems.
Showing total MOT tests, failures, and known problems per make. Hover over each bar for a full breakdown.
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Tell Us About Your Problem
Help other Triumph Gt6 owners — report a problem and we'll add it to the database
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Browse Triumph Gt6 Generations
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Most Common Triumph Gt6 MOT Failures
Every reason Triumph Gt6 vehicles fail their MOT, ranked by frequency. Select an individual year to see only that year’s failures, or stay on ‘All time’ for the combined picture across our 20 years of DVSA data. Scroll inside the table for the full list.
| # | Failure | % of failures |
|---|---|---|
| 1 | Suspension joint or bush worn | 8.80% |
| 2 | Number plate lamp not working | 7.47% |
| 3 | Brake performance below minimum | 7.42% |
| 4 | Front lamp not working | 4.64% |
| 5 | Parking brake condition | 4.27% |
| 6 | Front suspension joint worn | 3.45% |
| 7 | Exhaust system fault | 3.40% |
| 8 | Tyre condition | 3.08% |
| 9 | Shock absorber worn or leaking | 2.60% |
| 10 | Rear suspension fault | 2.44% |
| 11 | Parking brake performance below minimum | 2.37% |
| 12 | Tyre tread depth below limit | 2.28% |
| 13 | Stop lamp not working | 2.02% |
| 14 | Steering column fault | 1.93% |
| 15 | Seat belt condition | 1.70% |
| 16 | Suspension mounting corroded | 1.70% |
| 17 | Indicator fault | 1.68% |
| 18 | Horn not working | 1.59% |
| 19 | Driveshaft fault | 1.54% |
| 20 | Windscreen washer not working | 1.49% |
| 21 | Position lamp not working | 1.45% |
| 22 | Wiper blades deteriorated | 1.29% |
| 23 | Fuel pipe corroded or damaged | 1.20% |
| 24 | Steering coupling worn | 1.01% |
| 25 | Brake pedal fault | 0.99% |
| 26 | Brake hydraulic component worn | 0.97% |
| 27 | Headlamp fault | 0.97% |
| 28 | Steering free play excessive | 0.97% |
| 29 | Rear lamp not working | 0.94% |
| 30 | Steering rack fault | 0.94% |
| 31 | Track rod end worn | 0.94% |
| 32 | Fuel cap damaged or missing | 0.92% |
| 33 | Front suspension fault | 0.90% |
| 34 | Chassis condition | 0.87% |
| 35 | Steering arm worn | 0.85% |
| 36 | Wheel bearing worn | 0.85% |
| 37 | Steering wheel damaged or insecure | 0.78% |
| 38 | Headlamp aim defect | 0.78% |
| 39 | Subframe mounting corroded | 0.76% |
| 40 | King pin or swivel pin worn | 0.76% |
| 41 | Brake pads or linings worn | 0.74% |
| 42 | Brake disc or drum worn | 0.69% |
| 43 | Steering operation fault | 0.67% |
| 44 | Body corrosion or damage | 0.64% |
| 45 | Fuel hose damaged or leaking | 0.64% |
| 46 | Suspension linkage fault | 0.60% |
| 47 | Electrical wiring fault | 0.57% |
| 48 | Steering lock fault | 0.57% |
| 49 | Mirror damaged or missing | 0.55% |
| 50 | Ball joint dust cover split | 0.53% |
| 51 | Battery loose or leaking | 0.44% |
| 52 | Suspension arm worn or corroded | 0.41% |
| 53 | Tyre size or type not matched | 0.41% |
| 54 | Brake caliper fault | 0.39% |
| 55 | Brake wheel cylinder fault | 0.34% |
| 56 | Brake master cylinder or servo mounting fault | 0.30% |
| 57 | Suspension retaining or locking device fault | 0.30% |
| 58 | Brake air or vacuum system fault | 0.28% |
| 59 | Brake pedal movement restricted | 0.28% |
| 60 | Vehicle structure corrosion | 0.28% |
| 61 | Body security fault | 0.25% |
| 62 | Electrical switch fault | 0.25% |
| 63 | Handbrake cable fault | 0.25% |
| 64 | Steering shaft fault | 0.25% |
| 65 | Tie bar or rod worn or corroded | 0.25% |
| 66 | Fuel tank corroded or leaking | 0.23% |
| 67 | Rigid brake pipe corroded or damaged | 0.21% |
| 68 | Brake fluid leak | 0.18% |
| 69 | Driver seat fault | 0.18% |
| 70 | Driver door fault | 0.16% |
| 71 | Front passenger door fault | 0.16% |
| 72 | Leaf spring broken or corroded | 0.16% |
| 73 | Brake lever fault | 0.14% |
| 74 | Dashboard warning lamp fault | 0.14% |
| 75 | Drag link end worn | 0.14% |
| 76 | Speedometer fault | 0.14% |
| 77 | Trailing arm worn or corroded | 0.14% |
| 78 | Brake clevis joint worn | 0.11% |
| 79 | Coil spring broken or corroded | 0.11% |
| 80 | Hydraulic brake cylinder fault | 0.11% |
| 81 | Bonnet catch or hinge fault | 0.09% |
| 82 | Handbrake lever fault | 0.09% |
| 83 | Passenger seat fault | 0.09% |
| 84 | Spark ignition emissions above threshold | 0.09% |
| 85 | Windscreen damage affecting view | 0.09% |
| 86 | Anti-roll bar worn or corroded | 0.07% |
| 87 | Brake master cylinder fault | 0.07% |
| 88 | Exhaust emissions above threshold (non-catalyst) | 0.07% |
| 89 | Spring mounting corroded | 0.07% |
| 90 | Stub axle worn | 0.07% |
| 91 | Subframe corrosion or damage | 0.07% |
| 92 | Suspension coupling worn | 0.07% |
| 93 | Brake cable, rod, lever or linkage fault | 0.05% |
| 94 | Brake pedal linkage fault | 0.05% |
| 95 | Brake stationary pin worn | 0.05% |
| 96 | Engine oil leak | 0.05% |
| 97 | Flexible brake hose damaged | 0.05% |
| 98 | Leaf spring shackle bracket corroded | 0.05% |
| 99 | Rear reflector damaged or missing | 0.05% |
| 100 | Seat belt anchorage fault | 0.05% |
| 101 | Steering intermediate drop arm worn | 0.05% |
| 102 | Vehicle floor corroded | 0.05% |
| 103 | Bonded suspension condition | 0.05% |
| 104 | Anchor bracket corroded | 0.02% |
| 105 | Body strengthening plate corroded | 0.02% |
| 106 | Boot lid damaged or insecure | 0.02% |
| 107 | Brake back plate corroded or damaged | 0.02% |
| 108 | Brake servo fault | 0.02% |
| 109 | Dip switch fault | 0.02% |
| 110 | Exhaust leak | 0.02% |
| 111 | Fog lamp not working | 0.02% |
| 112 | Handbrake mechanism or mounting fault | 0.02% |
| 113 | Rear fog lamp not working | 0.02% |
| 114 | Securing bolts missing or insecure | 0.02% |
| 115 | Semaphore indicator fault | 0.02% |
| 116 | Spare wheel fault | 0.02% |
| 117 | Spring saddle corroded | 0.02% |
| 118 | Universal joint worn | 0.02% |
Showing all 118 reasons — scroll inside the table for the full list.
Triumph Gt6 MOT Failures by Category
Total MOT failure occurrences for the Triumph Gt6, grouped by category. Same data as the failures table above — just sliced by category instead of fault title. Hover a slice for the top failures in each category.
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Frequently Asked Questions
What are the most common Triumph Gt6 problems?
Based on analysis of 13K Triumph Gt6 MOT tests from DVSA data, we have 22 identified common problems across 1 generation. The most frequently flagged issue is "Brake performance below minimum". Brakes is the most common problem category.
Which Triumph Gt6 generation has the most problems?
The Triumph Gt6 GT6 (1966-1973) (1966–1973) has the highest number of identified common problems (30). Click the generation card above for the full breakdown.
How is this data calculated?
We analyse anonymised DVSA MOT test records under the Open Government Licence. An issue is classified as a "Common Problem" when it occurs significantly more often on a specific model than the UK average, confirmed at 99% statistical confidence. Read the full methodology page for details.
Can I report a problem with my Triumph Gt6?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Triumph Gt6 owners spot problems early. All submissions are reviewed before being added to the public database.
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