The picture
Grand C-Max: middle-of-the-pack on first-time pass
Across 45,595 MOT tests, the Grand C-Max returns 74.4% first-time pass — below the UK fleet average. The single most-logged Major fail is brake pads worn below 1.5 mm. Tyre tread under the limit and a number-plate lamp out round out the top three. Average tested mileage sits at 74,185, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
Top ten reasons for rejection.
- 01
a brake lining or pad worn below 1.5mm
2,043 occurrences · 4.5% of tests
- 02
Tyre tread depth not in accordance with the requirements
1,646 occurrences · 3.6% of tests
- 03
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
1,544 occurrences · 3.4% of tests
- 04
A tyre cords visible or damaged
1,420 occurrences · 3.1% of tests
- 05
A transmission shaft constant velocity joint boot severely deteriorated
1,259 occurrences · 2.8% of tests
- 06
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
1,074 occurrences · 2.4% of tests
- 07
Wiper blade missing or obviously not clearing the windscreen
981 occurrences · 2.2% of tests
- 08
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc
965 occurrences · 2.1% of tests
- 09
A suspension pin, bush or joint excessively worn
889 occurrences · 1.9% of tests
- 10
Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
818 occurrences · 1.8% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
Worst-case fix budget · top 4 failures
£208–£385
If every one of this Grand C Max's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
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Build your own retest budget.
Tools that pre-empt a retest.
Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
Item 01 · Amazon UK
Brake pad measurement gauge
Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.
Search Amazon UK
Item 02 · Amazon UK
Digital tyre-tread depth gauge
Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.
Search Amazon UK
Item 03 · Amazon UK
H7 / W21W bulb pack
A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.
Search Amazon UK
Owner reports · Honest John
What owners actually report.
Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.
What's good
Clutch failed on 2014 C-Max at 3,000 miles due to "complete burn out". DMF damaged due to hear. Slave cylinder also replaced "as a precaution". Same repeat scenario of what happens when the clutch slave cylinder fails. Escalated to Ford service team, driving style blamed and refusal to refund any costs. Standard complaint that we know all about. What probably happens is that the slave cylinder sticks giving the same effect as the driver slipping the clutch. No outward sign of a slave cylinder leak.
Where it falls short
Powershift dual clutch automatic transmission requires fresh fluid every 3 years at a cost of £250\.
Buying or keeping a Grand C Max?
Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a Grand C Max and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.