Brake then surge forward
Thread Starter
Member
Joined: Jun 2004
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1997 E 320 - 2000 S500
Brake then surge forward
2008 S550 72K
Sometime when I release brake the car surges forward - Similar to popping a clutch
Not always - just sometimes
Any ideas to what it could be?????
Sometime when I release brake the car surges forward - Similar to popping a clutch
Not always - just sometimes
Any ideas to what it could be?????
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Joined: Nov 2014
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From: Chicago burbs
2015 S550
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Joined: Dec 2004
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Yup. It is a fuel saving feature introduced to the 7g tranny some time in 2014. When stopped on a flat surface the tranny will go into neutral and when you release the brake it will engage. Depending on the phase of the moon some cars will develop the "tug" when engaging. There is a software fix for it. Drop at dealer and ask to apply KID patch. The exact tcu patch escapes me but the dealer will not exactly what to do.
Thread Starter
Member
Joined: Jun 2004
Posts: 217
Likes: 1
1997 E 320 - 2000 S500
Big Releif
Yup. It is a fuel saving feature introduced to the 7g tranny some time in 2014. When stopped on a flat surface the tranny will go into neutral and when you release the brake it will engage. Depending on the phase of the moon some cars will develop the "tug" when engaging. There is a software fix for it. Drop at dealer and ask to apply KID patch. The exact tcu patch escapes me but the dealer will not exactly what to do.
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Joined: Dec 2004
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They will charge you some labor. No part are required. If after the flash the problem persists then there are some additional steps that can be taken but those will be more expensive.
Campaigns are usually reserved for safety issues.
Campaigns are usually reserved for safety issues.
Thread Starter
Member
Joined: Jun 2004
Posts: 217
Likes: 1
1997 E 320 - 2000 S500
Just spoke to dealer
$157.00 for diagnostics
If not software patch what else might I expect ?
In addition it seems I should replace the Johnson rods as well 2008 S550 72 K miles
Please advise as I need to budget - Just purchased car which wiped out my reserve
Thank you in advance
