Limp Mode Problem

rf065

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Today I travelled down the dual c/way with cruise set at 65mph.
I braked to turn off the dual c/way & took a side road to the left, when I re-applied the throttle there was no power, the car had gone into limp mode.

I stopped and restarted the car & it was no longer in limp mode, but for the next few miles the gearchange was very erratic. Everytime I applied the throttle there was a delay as the auto box seemed to be changeing down a gear before it would accelerate.

I know I'll need the fault codes read, but could turning off a dual c/way reasonably fast trigger something to put it into limp mode? Low auto box oil level or something? The car was seviced 2 weeks ago & had the auto box oil & filter changed by MB at the same time, coincidence?

Russ
 

Cole@MBS

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Today I travelled down the dual c/way with cruise set at 65mph.
I braked to turn off the dual c/way & took a side road to the left, when I re-applied the throttle there was no power, the car had gone into limp mode.

I stopped and restarted the car & it was no longer in limp mode, but for the next few miles the gearchange was very erratic. Everytime I applied the throttle there was a delay as the auto box seemed to be changeing down a gear before it would accelerate.

I know I'll need the fault codes read, but could turning off a dual c/way reasonably fast trigger something to put it into limp mode? Low auto box oil level or something? The car was seviced 2 weeks ago & had the auto box oil & filter changed by MB at the same time, coincidence?

Russ

Sounds like a air mass fault! as you have already said, next step a short test needed!!
 
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rf065

rf065

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After thinking about it, the erratic gearchanges may be a red herring.
While in limp mode I drove for a few miles continually pressing the accelerator full to the floor.
As the auto box adapts to your driving style, I now think this was the reason for it continually dropping a gear and rapidly accelerating for the next few miles after I restarted the car.

Russ
 

teddycatkin

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Assuming it ran ok before the "service"--I would take it right back to who ever did it and ask them to sort it ?
 
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rf065

rf065

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Assuming it ran ok before the "service"--I would take it right back to who ever did it and ask them to sort it ?

As the MB workshops are closed from noon on Saturday to Monday morning, I'll have to wait till then. I will be using the car today though, so I will see if it does it again, maybe Mobilo will be a better option if it does?

Russ
 

teddycatkin

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Yes--spot on if it acts up park -and let them take over ? ( you may get a replacement car while its sorted )
Either way it needs to be back in the workshop Mon morning.
 
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