lost all gears 2001 W210 E280-4matic

[RobPr]

Last week I lost all gears.
The car drove well all day, but when I tried to pull away at a traffic light it shook and accelerated badly.

After the second traffic light, all managed to drive away by switching off the engine and starting it again, after that all gears were gone.

Now it stuck in Neutral

The errors were:
1- P2502 The gear in implausible or the transmission is slipping
2- P220A The speed comparison of Y3/6n2 to Y2/5y3 is implausible

Later I checked with DAS with the following results.

Sometimes the N3 value changes (Lower or 0).
The voltage (pin 38 on control module) to the valves is 3 Volt.


Rob

 

[malcolm E53 AMG]

Electric plate problem which is situated below the valve block in the gearbox a very common problem circa £130 for the plate and gearbox sump off so a filter and fluid change as well

 

[LostKiwi]

Simple things first, have you checked the ATF level?

 

[RobPr]

Simple things first, have you checked the ATF level?

Yes I did.

 

[ajlsl600]

Good luck with that, hope you find an economic solution. Plate, oil n filter best chance methinks..

 

[Uncle Benz]

If it has suddenly gone like this it’s most likely a speed sensor gone down. They are incorporated in the electroplate and are not too expensive to fix. It could be a more serious fault in the turbine. The centre bearing is likely to be the earlier bronze type in a W210. Cross your fingers, drop the transmission pan and look for gold coloured fragments. If there are none swap the electroplate.

 

[RobPr]

Electric plate problem which is situated below the valve block in the gearbox a very common problem circa £130 for the plate and gearbox sump off so a filter and fluid change as well

Without the TMC it should still shift (very harsh).
It is possible that a soleonoid or valve is stuck reducing the pressure.
I don't know if that would disable the shifting completely.

 

[RobPr]

If it has suddenly gone like this it’s most likely a speed sensor gone down. They are incorporated in the electroplate and are not too expensive to fix. It could be a more serious fault in the turbine. The centre bearing is likely to be the earlier bronze type in a W210. Cross your fingers, drop the transmission pan and look for gold coloured fragments. If there are none swap the electroplate.

The N2 speed sensor gives a plausible reading, about the same speed as the engine.
wouldn't it be lower with a faulty turbine?

 

[RobPr]

Today I removed the pan:

THe fluid is a bit brown and there are particles in it.
Some are shiny aluminium (not magnetic) and look like bronze colored (not sure).

According to WIS the centre bearing is a needle not the early bronze type.

 

[Uncle Benz]

Hmm. Fluid looks burnt to me. Does it smell burnt?

 

[RobPr]

Hmm. Fluid looks burnt to me. Does it smell burnt?

No not really.

 

[LostKiwi]

Certainly not healthy looking.

 

[RobPr]

I took the transmission apart.

The B2 clutch/brake was destroyed, three friction plates lost all friction material and the metal plates were worn.

Everything else looks ok.

Rob

 

[mioba]

Well done OP, you are on the right track, keep us posted !

 

[RobPr]

After replacing the worn B2 clutch the transmission works.
All other clutches were good.
Checked the fluid, no coolant in transmission.

Rob