Common problems

Vauxhall Signum common problems

What MOT testers find on the Vauxhall Signum: the parts that fail or get advisories most often at each age, against all cars of the same age. From 3,836 DVSA MOT tests taken 2022 to 2025.

MOT data updated 28 September 2026

At 17 years, the most tested age

Suspension fails per 100 MOTs (n=1,344)19.7

All cars at 17 years (n=4,040,458)17.2

Brakes advisories and minor defects per 100 MOTs (n=1,344)38.1

All cars, same age (n=4,040,458)31.1

What stands out

Brakes fails show up on 17.4 of every 100 MOTs of a Vauxhall Signum at 17 years old (n=1,344), against 12.3 for all cars of that age (n=4,040,458).
Lights and electrics fails are less common: 18.4 per 100 MOTs against 21.0 for all cars at the same age.
The fail item testers record most often at 17 years: coil spring broken, on 7.7 per 100 MOTs (all cars 3.5).
The most common advisory or minor defect: tread depth: worn close to legal limit/worn on edge, on 21.9 per 100 MOTs.

Problems by part at 17 years

How many of every 100 MOTs found a fail, or an advisory or minor defect, in each area. A test with faults in two areas counts in both.

Vauxhall Signum at 17 years (n=1,344) against all cars at 17 years (n=4,040,458). Per 100 MOTs.
Area	Fails	All cars	Advisories	All cars
Suspension	19.7	17.2	32.9	34.7
Lights and electrics	18.4	21.0	17.3	16.9
Brakes	17.4	12.3	38.1	31.1
Body and structure	10.0	8.3	20.1	13.9
Tyres	9.7	7.3	33.3	28.1
Exhaust, emissions and leaks	7.5	6.5	13.7	13.2
Windscreen, wipers and mirrors	6.2	7.1	5.9	6.0
Steering	1.6	3.6	3.4	5.1
Seat belts and airbags	1.0	2.5	1.8	1.2
Road wheels	0.8	0.6	0.4	1.4
Number plates and VIN	0.7	0.6	6.5	5.2

What testers fail most on the Signum at 17 years

Fail items on the Vauxhall Signum at 17 years (n=1,344), per 100 MOTs, with all cars at the same age (n=4,040,458).
Item	Area	Per 100 MOTs	All cars	Typical repair (estimate)
Coil spring broken	Suspension	7.7	3.5	£64 to £236 per spring (rough guide)
Rigid brake pipes: excessively corroded	Brakes	5.3	1.9	£137 to £392 per car (rough guide)
Driveshaft CV boot split	Body and structure	5.1	3.2	£88 to £196 per boot (rough guide)
Headlamp aim: projected beam image is obviously incorrect	Lights and electrics	4.3	3.6	£16 to £39 per car (rough guide)
Brake pads under 1.5 mm	Brakes	4.0	1.9	£72 to £174 per axle (rough guide)
Handbrake too weak	Brakes	3.6	2.7
Side/position light not working	Lights and electrics	3.4	5.8	£10 to £47 per lamp
Tyre tread below 1.6 mm	Tyres	3.1	3.0	£88 to £145 per tyre
Anti-roll bar link worn	Suspension	3.1	1.5	£33 to £102 per link (rough guide)
Wipers not clearing screen	Windscreen, wipers and mirrors	2.8	2.8	£15 to £30 per blade

Early warnings: advisories and minor defects at 17 years

Advisories and minor defects are recorded, but the car still passes. Across all cars, a part with an advisory or minor defect failed at the next MOT 5.5 times in 100 (n=88,666,940 pairs of consecutive MOTs), against 0.3 times in 100 when the same part had none (n=12,936,860,350).

Advisories and minor defects on the Vauxhall Signum at 17 years (n=1,344), per 100 MOTs, with all cars at the same age (n=4,040,458).
Item	Area	Per 100 MOTs	All cars	If it needs replacing (estimate)
Tread depth: worn close to legal limit/worn on edge	Tyres	21.9	17.9	£88 to £145 per tyre
Rigid brake pipes: corroded, covered in grease or other material	Brakes	17.3	10.5	£137 to £392 per car (rough guide)
Brake discs: worn, pitted or scored, but not seriously weakened	Brakes	14.6	11.3	£148 to £376 per axle (rough guide)
Engine oil leaks: leak, but not excessive	Exhaust, emissions and leaks	12.5	11.7
Coil spring: corroded	Suspension	10.2	7.5
Brake pads: wearing thin	Brakes	9.3	6.6	£72 to £174 per axle (rough guide)
Tyre condition: slightly damaged/cracking or perishing	Tyres	8.9	9.6	£88 to £145 per tyre
Exhaust system: has a minor leak of exhaust gases	Body and structure	8.8	4.8	£182 to £263 per section
Registration plate lamp(s): inoperative in the case of multiple lamps or light sources	Lights and electrics	7.9	5.9
Exhaust system: mounting defective	Body and structure	7.9	1.8	£28 to £108 per car (rough guide)

Repair estimates are a guide for an independent garage: labour at the national median local garage rate (median £78 an hour from 65 garages, ONS price quotes) times estimated labour hours, plus a parts band. Labour hours and most parts bands are estimates, not quotes, and prices vary by model, engine and region. A warning light fault shows the cost of the diagnosis only.

How problems change with age

Fails per 100 MOTs in the three most common areas at 17 years. Ages with fewer than 1,000 tests are not shown.
Age	Tests (n)	Suspension	Lights and electrics	Brakes
16 years	1,196	18.8	18.7	17.1
17 years	1,344	19.7	18.4	17.4
18 years	1,296	17.7	20.8	16.6

What to check on a viewing

On the Vauxhall Signum, testers most often record coil spring broken; rigid brake pipes: excessively corroded; driveshaft CV boot split. Look at these first, then the areas below.

Suspension

Listen for knocks or clonks over speed bumps and rough roads on the test drive.
Push down hard on each corner: the car should settle at once rather than keep bouncing.
Look behind the wheels for broken or heavily rusted coil springs and split rubber bushes.
Check that the car sits level and that no tyre is worn on one edge only.

Lights and electrics

With someone outside, try every light: dipped and main beam, indicators, brake lights, fog lights and number plate lamps.
Check that the warning lights come on with the ignition and go out once the engine runs.
Look for misted, cracked or yellowed headlamp lenses.

Brakes

On the test drive the car should stop in a straight line without pulling, juddering or grinding.
Look at the discs through the wheels for a deep lip, heavy rust or scoring.
Check that the handbrake or electronic parking brake holds the car on a slope.
Ask when the pads, discs and brake fluid were last changed, and for the receipts.

Ask for the car's MOT history and service record: advisories that repeat from one year to the next show what has been left. GOV.UK MOT history.

Questions

What are the most common problems on the Vauxhall Signum?

At 17 years, the age with the most MOT tests (1,344), the fail items testers record most often on the Vauxhall Signum are coil spring broken (7.7 per 100 MOTs), rigid brake pipes: excessively corroded (5.3 per 100 MOTs), driveshaft CV boot split (5.1 per 100 MOTs). The most common advisories or minor defects are tread depth: worn close to legal limit/worn on edge (21.9) and rigid brake pipes: corroded, covered in grease or other material (17.3).

Which parts of the Vauxhall Signum fail more often than on other cars?

At 17 years: brakes (17.4 per 100 MOTs against 12.3 for all cars); suspension (19.7 per 100 MOTs against 17.2 for all cars); tyres (9.7 per 100 MOTs against 7.3 for all cars). Compared with 4,040,458 MOTs of all cars the same age.

Vauxhall Signum problems by area

Other Vauxhall models

All Vauxhall models · Common problems by make

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

The all cars figures cover all class 4 vehicles (cars and light vans) tested at the same age.

Looking at a Vauxhall Signum?

These figures describe the model, not the car in front of you. Found one you might buy? See what the VetTheCar Buying Report covers, or use the tools that work without a registration.

See a sample report Car tools · MOT fail rates by model · Compare models by MOT record

Repair estimates: ONS consumer price quotes for local garage labour (09/2025 to 08/2026), the MOT inspection manual for defect wording, and estimated labour hours and parts bands. Not affiliated with or endorsed by ONS.

Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025. MOT data updated 28 September 2026.

Not affiliated with or endorsed by DVSA. How we calculate these figures · Data sources