Service inoperative warning!
Thread Starter
Senior Member
Joined: Jan 2015
Posts: 370
Likes: 16
2020 C8, 2020 defender 110X, 2019 720S, 2014 GLK 350 4matic, 2015 escalade platinum, 2013 RRS HSELux
Anybody got this warning in your GLK 350 4matic? Initially I thought it was just a warning then noticed a loss of power, needed to press on the gas more to keep vehicle moving, ECO button disappears or inoperative. After a restart, it's back to normal. Brought it to the dealer first time it happened but they did not pull any codes despite the obvious error message. I think it is a safety issue esp if you're trying to make a left turn and suddenly caught without any power.
Super Member
Joined: Aug 2011
Posts: 861
Likes: 38
From: Philly area
350 GLK, C280
Looks like you lost traction at speed while driving straight and the stability control became inoperative. If this is the case the system probably reduces the power to regain traction. This would not throw a code as it can happen a lot on bumpy roads.
The old traction control systems had a similar defect (my words). If you were starting out from a side street into traffic and one wheel hit some sand or something and started to spin, it would apply the brake to that wheel to force power to the other side. If the second wheel started to spin, the system would reduce power significantly. At that point you started to pray that you would regain power before the big truck bearing down on you turned you into a pancake. The idea was to force you to start slow in snow or ice that would spin both wheels. Not so good on sandy or simply wet busy roads.
The old traction control systems had a similar defect (my words). If you were starting out from a side street into traffic and one wheel hit some sand or something and started to spin, it would apply the brake to that wheel to force power to the other side. If the second wheel started to spin, the system would reduce power significantly. At that point you started to pray that you would regain power before the big truck bearing down on you turned you into a pancake. The idea was to force you to start slow in snow or ice that would spin both wheels. Not so good on sandy or simply wet busy roads.
Thread Starter
Senior Member
Joined: Jan 2015
Posts: 370
Likes: 16
2020 C8, 2020 defender 110X, 2019 720S, 2014 GLK 350 4matic, 2015 escalade platinum, 2013 RRS HSELux
Looks like you lost traction at speed while driving straight and the stability control became inoperative. If this is the case the system probably reduces the power to regain traction. This would not throw a code as it can happen a lot on bumpy roads. The old traction control systems had a similar defect (my words). If you were starting out from a side street into traffic and one wheel hit some sand or something and started to spin, it would apply the brake to that wheel to force power to the other side. If the second wheel started to spin, the system would reduce power significantly. At that point you started to pray that you would regain power before the big truck bearing down on you turned you into a pancake. The idea was to force you to start slow in snow or ice that would spin both wheels. Not so good on sandy or simply wet busy roads.
Thread Starter
Senior Member
Joined: Jan 2015
Posts: 370
Likes: 16
2020 C8, 2020 defender 110X, 2019 720S, 2014 GLK 350 4matic, 2015 escalade platinum, 2013 RRS HSELux
At first I thought it was a different tire pressure, But disappears on restart and no codes pulled "per dealer." Could be due to terrain difference but should not be sending those warnings.
Newbie
Joined: Feb 2015
Posts: 2
Likes: 0
2014 GLK350
So frustrating! I have fault codes, they still won't fix it. I drive 121 miles round trip everyday. It's extremely dangerous when I'm going 80mph on the highway and I lose "power". The first dealership updated the software. 2 months later it happened again, now the dealership in my home town won't fix it because they can't recraate the problem 
it would be great to hear if you find a resolution!
it would be great to hear if you find a resolution!
