JasonHookey
New Member
Hi All,
I am absolutely livid with Mercedes (Harrogate mainly) right now and wanted to see if my problem is common before I explode!
So I have a 2017 C250d 4matic, 9-speed gearbox. Lovely car, driver assistance package.....sweet. Got is as I live 140 miles from my office (yep, each way, don't ask) and wanted something nice but reasonably economic for the commute.
It was all going great until recently. Last service, they updated drive train software and engine management. Since this, when in automatic and cruise control at 70mph it won't go into 9th gear!!! My local dealership (Harrogate MB ) did some tests and said car was fine (although did almost no testing at 70mph) and that the car went into 9th at 76mph...which i pointed out was illegal!
So I did some further testing and it's weird. So using paddle shift I can manually go into 9th at 70mph and if I manually down-select to 8th the car RECOMMENDS I go into 9th! As soon as it drops back to automatic this up-shift recommendation goes and I stick in 8th. My local dealer said this was 'different software' using 'different sensors' but that seems strange to me????
They then tried to tell me it was the same economy - they'd done a test using a pump measure of fuel in, a drive (not motorway at 70mph I add) and then filled it up and calculated it. Since this came out at 48mph they were happy - me pointing out that at a 56mph average it WILL do 48mpg and my problem was at 70mph didn't land with them and they then told me the reading on the dash is not appropriate for measuring fuel consumption. I get it's an average and it's not 100% accurate but if I do the same drive, at the same time in comparable conditions 100's of times and since it now won't select 9th it's showing 5mpg lower, calibrated or not that large data set show's there is a comparative problem.
So to me it was simple - if the car, at 70mph is revving at 1800rpm for 2hrs in 8th on the motorway but I manually put it 9th and it drops to 1100rpm, this will burn the same fuel will it?? They are trying to fob me off and it's really getting to me.
The final thing is that apart from maybe 1 other person and me, this isn't a common problem to them.......so I want to test this.......
Please, if you have a similar 9th gear issue, can you please reply to this threat telling me what your issues are? I have no idea if I'll get anywhere but it possibly will (a) make me feel a bit better and (b) help me prove to Mercedes they have a real problem here.
Really long post for a 1st one but my blood is boiling here and I want to know if I'm nuts or I'm right and there are lots of us in the same boat!
Thank you for any advice or confirmation you've got the same problem.
Jason
I am absolutely livid with Mercedes (Harrogate mainly) right now and wanted to see if my problem is common before I explode!
So I have a 2017 C250d 4matic, 9-speed gearbox. Lovely car, driver assistance package.....sweet. Got is as I live 140 miles from my office (yep, each way, don't ask) and wanted something nice but reasonably economic for the commute.
It was all going great until recently. Last service, they updated drive train software and engine management. Since this, when in automatic and cruise control at 70mph it won't go into 9th gear!!! My local dealership (Harrogate MB ) did some tests and said car was fine (although did almost no testing at 70mph) and that the car went into 9th at 76mph...which i pointed out was illegal!
So I did some further testing and it's weird. So using paddle shift I can manually go into 9th at 70mph and if I manually down-select to 8th the car RECOMMENDS I go into 9th! As soon as it drops back to automatic this up-shift recommendation goes and I stick in 8th. My local dealer said this was 'different software' using 'different sensors' but that seems strange to me????
They then tried to tell me it was the same economy - they'd done a test using a pump measure of fuel in, a drive (not motorway at 70mph I add) and then filled it up and calculated it. Since this came out at 48mph they were happy - me pointing out that at a 56mph average it WILL do 48mpg and my problem was at 70mph didn't land with them and they then told me the reading on the dash is not appropriate for measuring fuel consumption. I get it's an average and it's not 100% accurate but if I do the same drive, at the same time in comparable conditions 100's of times and since it now won't select 9th it's showing 5mpg lower, calibrated or not that large data set show's there is a comparative problem.
So to me it was simple - if the car, at 70mph is revving at 1800rpm for 2hrs in 8th on the motorway but I manually put it 9th and it drops to 1100rpm, this will burn the same fuel will it?? They are trying to fob me off and it's really getting to me.
The final thing is that apart from maybe 1 other person and me, this isn't a common problem to them.......so I want to test this.......
Please, if you have a similar 9th gear issue, can you please reply to this threat telling me what your issues are? I have no idea if I'll get anywhere but it possibly will (a) make me feel a bit better and (b) help me prove to Mercedes they have a real problem here.
Really long post for a 1st one but my blood is boiling here and I want to know if I'm nuts or I'm right and there are lots of us in the same boat!
Thank you for any advice or confirmation you've got the same problem.
Jason