2010 C350 CDI DPF / gearbox issue

[Johnsnz]

Hi,

I have some weirdness going on with My w204 C350 CDI

Ok the issue has been occasionally I get the car wanting to rev to around 2750rpm before changing up this is in comfort mode. Down shifts are ok but with a ‘bump/ bang’ from 2nd to 1st when coming to a stop.

When this is going on the car feel down on power. I also get no kick down so I assume its in limp mode…

Switch car off and on again and the problem disappears. Being stuck in heavy stop start traffic seems to cause it to fault like this.

The car has been scanned by myself and my local garage with no fault codes found either on the engine or gearbox.

The other day however it threw up a P2454 code and was defiantly in limp mode.
The garage cleaned the lines to the low pressure sensor and this sorted the fault code. Car drove very nicely. Today I have the high rev up shift issue back. No CEL no codes in gearbox or Engine.

Any thoughts to what my issue might be and has anyone experienced anything similar.

Initially I thought gearbox conductor plate… now I’m thinking DPF issues… ( I need to stop reading Google)

Gearbox has been serviced recently with fluid and filter.

Thanks for any advice…

 

[Gnasher141]

Have you tried resetting gearbox adaptations?

How to re-set gearbox adaptations 722.6 instructions

Thought I'd start a new post on how to re-set gearbox adaptations. I found this page this morning, Is it right that the car must be left running for 10 mins after? How do you re-set them before adaptation takes place? http://www.scribd.com/doc/112791122/Adaption-Transmission-722-6

forums.mercedesclub.org.uk

 

[Johnsnz]

Have you tried resetting gearbox adaptations?

How to re-set gearbox adaptations 722.6 instructions

Thought I'd start a new post on how to re-set gearbox adaptations. I found this page this morning, Is it right that the car must be left running for 10 mins after? How do you re-set them before adaptation takes place? http://www.scribd.com/doc/112791122/Adaption-Transmission-722-6

forums.mercedesclub.org.uk

Thanks for that..

A couple of things.

1. A 722.6 is not the trans in a W204 that’s a 722.9

2. Isn’t the procedure in your links just resetting the throttle nothing to do with the gearbox adaptions.(in a 722.9) I thought for that you needed to access the Relevant ECU and work with that to reset the shift points in the trans?

I also thought the ‘throttle reset’ actually did nothing in reality.. Although that depends on which internet posts you read.

If the gearbox adaptions are ‘bad’ then wouldn’t I experience issue with poor shifting all the time rather than intermittently??

 

[TeddyRuxpin]

Doesn’t sound like an adaptation thing - there is obviously a problem.

How much is a new sensor? Sounds like the first place to start, if cheap.

 

[Johnsnz]

Doesn’t sound like an adaptation thing - there is obviously a problem.

How much is a new sensor? Sounds like the first place to start, if cheap.

Yep I thought that might be a place to start… But if the sensor was duff then wouldn’t I be getting a fault code thrown up more regularly?? So far only thrown once with obvious signs of being in limp mode and cleaning the feed line to the sensor resolved the issue..

 

[AndrewOl]

Does sound like the gearbox is going into safety mode but you say there is no codes which is weird. I take it the codes are being read by a star system?