Jbaz
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- Jan 29, 2023
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- Your Mercedes
- C class W205 2019 c200 1.5 Petrol
Hi there. I have a 2019 plate petrol 9tronic c class. Car has been running great since we got it last August but over the past 24 hours, has been acting strange when driving on motorways at 70mph.
Normally at these speeds, it is well up to 9th gear. Usually around 65mph.
Was driving last night on the motorway for about 10 mins and saw average fuel economy was only around 25mpg and noticed the car was in D7 at 70mph. No matter what happened, car would only shift up to 8th and 9th manually via paddle. Even when accelerating hard, it would drop down okay but then only climb and plateau at 7th max.
On normal driving conditions, the car is in 7th gear at 45ish mph so to not shift up at all even when getting to 70 or 80 is not normal behaviour for our car. Even in ECO mode, the car will now not change up by itself to high gears. Keeping at 2500-3000 revs at that speed is not economical.
I’ve checked these forums and have tried a couple of things such as resetting auto transmission today, to no avail. I am wondering if this is a wider electrical or gearbox issue.
The car is due a service in 2 months and has full service history. It has not received any recent dealership updates unless for some reason it’s happened remotely over night. I have read a couple of other posts about diesels with NOx emission updates but ours is a petrol and still not even shifting to higher gears beyond 75mph. Also don’t think it’s the cold weather as it wasn’t doing this when it was -5 degrees and has been quite mild yesterday and today.
Any help or advice is greatly appreciated. We have a 2 year private warranty arranged through non-MB dealership so would probs have to diagnose any issue ourselves and claim any repairs through them.
Cheers!
Normally at these speeds, it is well up to 9th gear. Usually around 65mph.
Was driving last night on the motorway for about 10 mins and saw average fuel economy was only around 25mpg and noticed the car was in D7 at 70mph. No matter what happened, car would only shift up to 8th and 9th manually via paddle. Even when accelerating hard, it would drop down okay but then only climb and plateau at 7th max.
On normal driving conditions, the car is in 7th gear at 45ish mph so to not shift up at all even when getting to 70 or 80 is not normal behaviour for our car. Even in ECO mode, the car will now not change up by itself to high gears. Keeping at 2500-3000 revs at that speed is not economical.
I’ve checked these forums and have tried a couple of things such as resetting auto transmission today, to no avail. I am wondering if this is a wider electrical or gearbox issue.
The car is due a service in 2 months and has full service history. It has not received any recent dealership updates unless for some reason it’s happened remotely over night. I have read a couple of other posts about diesels with NOx emission updates but ours is a petrol and still not even shifting to higher gears beyond 75mph. Also don’t think it’s the cold weather as it wasn’t doing this when it was -5 degrees and has been quite mild yesterday and today.
Any help or advice is greatly appreciated. We have a 2 year private warranty arranged through non-MB dealership so would probs have to diagnose any issue ourselves and claim any repairs through them.
Cheers!