MOT failures by make
Chrysler MOT failures for “Rbt (sp): efficiency less than 50% of the required value”
Chrysler cars failed their MOT on “Rbt (sp): efficiency less than 50% of the required value” in 2.27% of 37,657 tests in 2023–2024 (853 tests) — 4.5 times as often as comparable cars of the same age, mileage and fuel, which would have failed on it in about 0.51% of tests. It is the number 11 most common failure item on Chryslers.
Data to 2024-12-30 · Page updated 2026-09-28 · Publisher: 73 Auto
- Chrysler tests failing on it
- 2.27%
- 853 of 37,657 tests, 2023–2024
- Comparable cars
- 0.51%
- national rate at the same age, mileage and fuel
- Observed ÷ expected
- 4.46×
- 73 Auto analysis · rank #11 for Chrysler
How unusual this is for the make
Across all MOT failures, Chryslers fail 1.03× as often as comparable cars. On this item the gap is 4.31× wider than that overall level, so it is a genuine Chrysler pattern rather than a reflection of how often the make fails in general. It is a dangerous defect in the brakes part of the test. Nationally it appears on 0.28% of MOT tests.
Chrysler models and “Rbt (sp): efficiency less than 50% of the required value”
One Chrysler model has enough tests to compare. Not every model follows the make: the pattern is concentrated in some models. Model rows compare with cars of the same age and fuel.
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Chrysler Grand Voyager | 10,029 | 4.04% | 5.51× |
By age at test
The difference is largest at 9-10 years old: 1.37% of Chrysler tests against 0.20% for comparable cars.
| Age (years) | Chrysler tests | Chrysler | Comparable cars |
|---|---|---|---|
| 9-10 | 7,362 | 1.37% | 0.20% |
| 11-12 | 6,217 | 1.63% | 0.32% |
| 13-15 | 5,588 | 3.76% | 0.61% |
| 16+ | 17,128 | 2.46% | 0.71% |
Other Chrysler MOT faults that stand out
- Anti-lock braking system: warning lamp indicates an ABS fault · 3.51× comparable cars
- Rbt (sp): efficiency below requirements · 2.13× comparable cars
- Parking brake performance: inoperative on one side · 2.49× comparable cars
Limitations
Official data: DVSA's anonymised MOT results (2023–2024), class 4 initial tests, cars at least 2.5 years old. 73 Auto analysis: the comparison rate applies the national rate of this item for each test's own age, mileage band and fuel to the Chrysler tests. An MOT result reflects maintenance, mileage and how a car is used as well as its design, so this is not a measure of which make is most reliable. The wording of the defect is DVSA's.
Has this Chrysler failed on it before?
Enter a registration to see that car’s own MOT history, advisories and the running costs 73 Auto expects. Your first check is free and shows the vehicle summary and its headline ownership cost. The category-by-category breakdown is part of a paid check.
UK number plate or 17-character VIN
Where these figures come from
- Anonymised MOT tests and results (2023 and 2024) — Driver and Vehicle Standards Agency (DVSA). Open Government Licence v3.0.
Figures labelled as 73 Auto estimates are our own analysis of these sources, set out in the methodology and data sources. To report a factual error, see corrections.