Is the Vauxhall Signum reliable?

The Vauxhall Signum has an average MOT pass rate of 71% across 6 years, based on 2,233 tests in 2026. That's 11 points below the national average of 82%. The most reliable year is 2003 with a 77% pass rate.

Which year Vauxhall Signum is best?

The 2003 Vauxhall Signum has the highest MOT pass rate at 77%, while the 2008 model has the lowest at 63%. There's a 14 percentage point spread between the best and worst years.

Vauxhall Signum

Reliability, running costs, and MOT data across 6 years from 2,233 real MOT tests.

Avg Pass Rate

71%

Total Tests

2,233

Best Year

2003 (77%)

Years Covered

About the Vauxhall Signum

The Vauxhall Signum has been tested 2,233 times in 2026 MOT data across 6 model years (2003 to 2008), with an average pass rate of 71%. That's 11 points below the national average of 82%, so check the year-by-year data carefully before buying. Available as petrol and diesel.

Best and Worst Years

The 2003 model is the most reliable with a 77% pass rate from 111 tests. The 2008 model has the lowest at 63%. The 14 point spread between years means reliability varies somewhat, but no year is dramatically different.

Reliability Trend

The VAUXHALL SIGNUM has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.

Mileage Across Years

The oldest model in our data (2003) averages 111,342 miles, while the newest (2008) averages 130,218 miles. Older models have covered serious mileage, so suspension and drivetrain wear are worth checking.

Compared to the Vauxhall brand average of 84%, the Signum is 13 points lower, placing it among the less reliable Vauxhall models.