G 270 cdi 05/06 gearbox problem never ends..
Hi! I have had a problem with the G270 cdi 05/06 for quite some time. The guys at the workshop does not seem to get it working, and it almost looks like the fault just continues when they fix it, in a way.
First problem was gas pedal-wire stuck. Tectyl was stuck to the wire, so got that fixed. Then the pre-heater element drained all the electricity from the car, so that was removed.
Then it really started. Kick-down on the highway, and the EPC came on. Everything was ok, except, it would not let me accelerate above 120 km/t. After this it was only a problem when kick-down, but after a while the engine got hot. It seemed like some water-pump issue. But we had to clean the radiator for dust and debris as well to get the temp down. The G has three radiators beneath each other, and if the first and second is full of dirt, well, the third one will never see any fresh air.
So now the gearbox goes into "limp home mode", and this has been the issue for the last three months. It will not go away.
We have checked if the electronic plate in gearbox has gotten oil from gearbox, as i have heard this is really common. It has not. The electric plate itself is also said to be working..
Changed speed sensors.
Changed rpm sensors.
Changed two sensors on the pedal.
All cables seems to work fine.
New oil on transmission. No glycol in transmission from the radiator/oil cooler.
The only diagnostic code we have at the moment is CAN(M?) fault between transmission and transfer case.
I was just hoping that someone has faced this issue before, and hopefully have some kind of clue!? I really appreciate any advice.
I personally would not be surprised at the problem being the CAN/BUS line.
I have experienced a similar but differing fault. On a W124 during the time flooding became News in the UK; a W124 came in with water ingress into the the passenger foot well. Being a fleet vehicle the company did not want to pay to drain the water so I was instructed to leave the water in. The problem was every time the driver's door opened a fault would register; reading the fault code on each occasion would show up a different cause.
It was only after studying the electrical circuit I noticed that the different fault being registered were shared by a common CAN/BUS line in the circuit. The CAN/BUS line is designed to transmit different signal to operate different components sharing the same line hence the different fault codes. Subsequently draining the water and renewing the CAN/BUS line cured the problem.
If you can check the wiring circuit and compare all the fault you have experienced - do these share a common CAN/BUS line? You should have your answer.
Good Luck and keep us informed.
Boost leaks would have given some signals to the ecu maybe? But, yes i`ll have that in mind. I know that fuel filters can also cause problems. I have an Lancia Delta Integrale aswell, and i changed it to the better earlier this year. I`ll make sure it is changed as well.
For this car i have chosen to not do anything myself. Yet. My freind is a mechanic on these cars, so i trust him. But at the same time, i make myself i need of him, and at the same time i do not want to call him every other day. So this "project" i s a bit special. It never ends in a way..
But i found this mercedes 722.6 video on youtube about the conductor plate connected to the transferbox. And i think i really have to check that one part up! It consist of connectors, a plug and solenoids. One of those might be the issue :) And it is not too expensive either..
Yeah, the module in the gearbox. I found one here, should be a good replacement, but maybe worth going for original mercedes when one does the job? This is it: http://www.summitracing.com/int/parts/rnb-917-678/applications
My mechanic friend wanted to check some cables between the electronic box inside the car and the transfer case, and one more thing, before changing the electric box in the gearbox.. Hopefully we are not too long from the finish line now ;)
The 400cdi has had it`s problems, so it guess they had some issues to take care of in mid life line. Not sure about mine 270cdi..
Btw, do you know if there is anywhere that the cables are prone to crack, twist or anything, that we should check out?
Hi Guys!
Some weeks passed by, but still the same problem. Changed this : A 4635452732. An electronic control unit, bit it did not change anything.
What we know now is that we have a can-bus problem related to the gearbox.. In a couple of days there will be sent a case to mercedes in germany to help us further. But off course, it would have been wonderful if someone know of any tips connected the can-bus problem..
As i have understood, it is not possible that something else can be related to the can-bus problem other the control units, plugs or cables connected to the can bus. But am i wrong?
Attached is one of the few lucky moments this year. This is last sunday, early and alone in the woods before people woke up :)
Hi. I am sad to say the problem continues.
The legendary conductor plate and valve housing has been changed. Together with oil, filter, gasket and so on. That did not help. But i guess this part makes the gearbox run more smoothly(when it finally is driveable)
Then we changed the control unit that is conected to the gear lever. I thought this had been done, but it has only been looked at to see if it had gotten any oil spillage from the cable in the box. Off course this did not help either..
They did also try to check the can/bus lines with a tool while driving, to see what happens just when it goes into limp home mode. But they were not able to find anything there either..
In a way, this problem now seems to be to big to be fixed. It`s a 50 000 euro vehicle that is not possible to fix. At this moment i really don`t know what to do. Our son is 7 months, and we bought the car as a familiy car. He has still not been able to sit in the back seat of it.
hi astrisjuls
PM me with your VIN number
and all fault codes ect
symptoms and mileage
and i will see what i can do
Arian
ps
where are you located?
Not to hijack the conversation or anything, but this is my fear. I have been reading up a lot on some of the problems G's tend to run into, and gearbox is number 1. I want a G for all of the fun and freedom it will bring, but if I am forever fixing it (or in your case trying to fix it with a never ending problem) and sinking money into it, I fear that it will strip me of that joy.
How often do you all normally have to replace your gearbox?
How often: Never.
I think that the above story is a case of very bad luck. The G's tend to last a lot longer than many other vehicles, so there will be the case of occasional problems when a vehicle is 20 years old or more.
The 4-speed all- hydraulic gearboxes were probably the most reliable, but don't have the refinement of the later electronically-controlled ones. Of these, the 5-speed generally has few problems (above case is not typical). The later, 7-speeds have had more issues. They are all gearboxes that are used on other vehicles in the Mercedes range. There is nothing different here for the G. In the western world, Merecedes is one of the few remaining auto manufacturers that still produces its own gearboxes. GM is the notable other. The rest are mostly from the ZF stable. (The transfer case is manufactured by ZF)
As far as engines go, the modern diesels rely on too many sensors, in my opinion, and this makes them less reliable than the older ones, albeit, they are a whole lot more powerful and economic. Some 'gearbox troubles' can actually be engine sensor problems or CAN communication. The petrol engines, particularly the M110, M103, the M112 and M113 are pretty-much bullet-proof, as are the older diesels OM 617,OM 603 ,OM 642 etc
I have a number of MB cars, youngest being 2001, and none have had any gearbox troubles.
But, regular oil and filter changes are required, even for the so-called, 'sealed for life' versions.
Buy a pre electronic revolution g-wagen, an earlyish [1990-94] w463. Autos are only 4 speed but those and the rarer 5 speed manual from that era are close to indestructible. 6 speed manuals can be fitted retroactively and also have a very good rep
Not to hijack the conversation or anything, but this is my fear. I have been reading up a lot on some of the problems G's tend to run into, and gearbox is number 1. I want a G for all of the fun and freedom it will bring, but if I am forever fixing it (or in your case trying to fix it with a never ending problem) and sinking money into it, I fear that it will strip me of that joy.
How often do you all normally have to replace your gearbox?
That's the first time I've heard of G Wagen gearboxes being the number 1 issue!
I know this is not what you want to hear
Get a pedalbox and put an om606 td in it with either a 5 or 6 speed box
The cdi engines do good money
Or convert the 2.7 cdi to manual but you will not have a high top speed as they are low revving
Have a look on grand cherokee 2.7crd and see what issues they have had
Its time to think about getting this thing running and reliable so you can enjoy it
Enough is i enough i would be thinking
Well, while doing research (beyond this forum), it was the main problem that kept coming up. Since I kept seeing gearbox problem discussion everywhere, I started getting a little worried.
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