R170 Auto Box LIMP Mode? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 02-20-2018
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R170 Auto Box LIMP Mode?

Had a little issue the other day after giving the car some heavy right foot from almost cold ( yes i know bad boy) - it redlined before change down but them sulked a bit - lost kick down and clonked when coming to a stop. Sounded like gearbox trying to change down but not having it.

It still drove but very under powered and still a bit clonky when going from P to D etc - so did the ECM reset and its been fine since.

Been "advised" the car slipped into limp mode as the harsh use when cold sent the ECU into a confused state. Basically though it was in the wrong gear hence ECU reset - now changes gear perfectly - smoothly - quietly and all power is returned.

No dash lights - no EML - But it does not have one so it wouldn't.

Is this even possible - hard to believe the car got confused

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#2 Old 02-20-2018
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I find the system to be "dumb". if you do anything outside of it's programmed limits it will do that. cold shouldn't really matter, but it must have confused a sensor somewhere.

I have a new conductor plate and everything, yet sometimes if I spin a tire coming out of a corner it goes straight into limp mode...
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#3 Old 02-20-2018
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Quote:
Originally Posted by TN6SLK View Post
Had a little issue the other day after giving the car some heavy right foot from almost cold ( yes i know bad boy) - it redlined before change down but them sulked a bit - lost kick down and clonked when coming to a stop. Sounded like gearbox trying to change down but not having it.

It still drove but very under powered and still a bit clonky when going from P to D etc - so did the ECM reset and its been fine since.

Been "advised" the car slipped into limp mode as the harsh use when cold sent the ECU into a confused state. Basically though it was in the wrong gear hence ECU reset - now changes gear perfectly - smoothly - quietly and all power is returned.

No dash lights - no EML - But it does not have one so it wouldn't.

Is this even possible - hard to believe the car got confused

SLK230 1998 .
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#4 Old 02-20-2018
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Quote:
Originally Posted by Turdo2 View Post
I find the system to be "dumb". if you do anything outside of it's programmed limits it will do that. cold shouldn't really matter, but it must have confused a sensor somewhere.

I have a new conductor plate and everything, yet sometimes if I spin a tire coming out of a corner it goes straight into limp mode...
Now THAT is sad 😕


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