E63s m157 cutting power after 5k rpms
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w212 E 63 s
E63s m157 cutting power after 5k rpms
Hello everyone,
I would greatly appreciate any help or insight on this issue because I’m honestly starting to run out of ideas.
I have a 2014 W212 E63 S AMG (M157) with around 64k miles. I’ve owned the car for roughly 10k miles and the maintenance history on the car is extremely solid. I stay on top of service and have not cheaped out on maintenance or repairs.
About 6 months ago, I started noticing the car would suddenly cut power / limit boost around 5k RPM and above. What’s strange is the car feels completely normal below that RPM range. It pulls hard through 1st gear and builds full boost normally, but once I get into the higher RPM range (roughly 5k-7k), it starts feeling sluggish and won’t continue pulling properly.
At first there were no CELs, but I had code:
P227F00
After researching, I suspected a faulty MAP sensor on bank 2 or possibly a wiring issue because the problem was intermittent — some weeks the car felt almost normal, other weeks it would limit power badly. I replaced the suspected map sensor, but the issue remained.
A few months later I then received which through a CEL, But only for about 24 hours and never came back.
P227D
At that point I took the car to a reputable European shop for proper diagnostics. The following was performed:
the car idles and drives fine otherwise
boost comes on hard initially
issue mainly appears in the upper RPM range under heavier load
sometimes the car will randomly have “good weeks” where it feels much stronger
Because of this, I’m beginning to wonder if this could potentially be fuel related rather than boost leak related possibly HPFP related or another fueling issue that only becomes apparent in the higher RPM range when fuel demand increases.
At this point I’m trying to avoid continuing to throw random parts at the car and would really appreciate any advice from people familiar with the M157 platform or anyone who has experienced something similar. Please ask me any question's if needed! Im Stressed!
I would greatly appreciate any help or insight on this issue because I’m honestly starting to run out of ideas.
I have a 2014 W212 E63 S AMG (M157) with around 64k miles. I’ve owned the car for roughly 10k miles and the maintenance history on the car is extremely solid. I stay on top of service and have not cheaped out on maintenance or repairs.
About 6 months ago, I started noticing the car would suddenly cut power / limit boost around 5k RPM and above. What’s strange is the car feels completely normal below that RPM range. It pulls hard through 1st gear and builds full boost normally, but once I get into the higher RPM range (roughly 5k-7k), it starts feeling sluggish and won’t continue pulling properly.
At first there were no CELs, but I had code:
P227F00
After researching, I suspected a faulty MAP sensor on bank 2 or possibly a wiring issue because the problem was intermittent — some weeks the car felt almost normal, other weeks it would limit power badly. I replaced the suspected map sensor, but the issue remained.
A few months later I then received which through a CEL, But only for about 24 hours and never came back.
P227D
At that point I took the car to a reputable European shop for proper diagnostics. The following was performed:
- smoke test
- wiring/voltage testing
- leak inspection
the car idles and drives fine otherwise
boost comes on hard initially
issue mainly appears in the upper RPM range under heavier load
sometimes the car will randomly have “good weeks” where it feels much stronger
Because of this, I’m beginning to wonder if this could potentially be fuel related rather than boost leak related possibly HPFP related or another fueling issue that only becomes apparent in the higher RPM range when fuel demand increases.
At this point I’m trying to avoid continuing to throw random parts at the car and would really appreciate any advice from people familiar with the M157 platform or anyone who has experienced something similar. Please ask me any question's if needed! Im Stressed!
Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,795
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
weakness above 3k
Hello everyone,
I would greatly appreciate any help or insight on this issue because I’m honestly starting to run out of ideas.
I have a 2014 W212 E63 S AMG (M157) with around 64k miles. I’ve owned the car for roughly 10k miles and the maintenance history on the car is extremely solid. I stay on top of service and have not cheaped out on maintenance or repairs.
About 6 months ago, I started noticing the car would suddenly cut power / limit boost around 5k RPM and above. What’s strange is the car feels completely normal below that RPM range. It pulls hard through 1st gear and builds full boost normally, but once I get into the higher RPM range (roughly 5k-7k), it starts feeling sluggish and won’t continue pulling properly.
At first there were no CELs, but I had code:
P227F00
After researching, I suspected a faulty MAP sensor on bank 2 or possibly a wiring issue because the problem was intermittent — some weeks the car felt almost normal, other weeks it would limit power badly. I replaced the suspected map sensor, but the issue remained.
A few months later I then received which through a CEL, But only for about 24 hours and never came back.
P227D
At that point I took the car to a reputable European shop for proper diagnostics. The following was performed:
the car idles and drives fine otherwise
boost comes on hard initially
issue mainly appears in the upper RPM range under heavier load
sometimes the car will randomly have “good weeks” where it feels much stronger
Because of this, I’m beginning to wonder if this could potentially be fuel related rather than boost leak related possibly HPFP related or another fueling issue that only becomes apparent in the higher RPM range when fuel demand increases.
At this point I’m trying to avoid continuing to throw random parts at the car and would really appreciate any advice from people familiar with the M157 platform or anyone who has experienced something similar. Please ask me any question's if needed! Im Stressed!
I would greatly appreciate any help or insight on this issue because I’m honestly starting to run out of ideas.
I have a 2014 W212 E63 S AMG (M157) with around 64k miles. I’ve owned the car for roughly 10k miles and the maintenance history on the car is extremely solid. I stay on top of service and have not cheaped out on maintenance or repairs.
About 6 months ago, I started noticing the car would suddenly cut power / limit boost around 5k RPM and above. What’s strange is the car feels completely normal below that RPM range. It pulls hard through 1st gear and builds full boost normally, but once I get into the higher RPM range (roughly 5k-7k), it starts feeling sluggish and won’t continue pulling properly.
At first there were no CELs, but I had code:
P227F00
After researching, I suspected a faulty MAP sensor on bank 2 or possibly a wiring issue because the problem was intermittent — some weeks the car felt almost normal, other weeks it would limit power badly. I replaced the suspected map sensor, but the issue remained.
A few months later I then received which through a CEL, But only for about 24 hours and never came back.
P227D
At that point I took the car to a reputable European shop for proper diagnostics. The following was performed:
- smoke test
- wiring/voltage testing
- leak inspection
the car idles and drives fine otherwise
boost comes on hard initially
issue mainly appears in the upper RPM range under heavier load
sometimes the car will randomly have “good weeks” where it feels much stronger
Because of this, I’m beginning to wonder if this could potentially be fuel related rather than boost leak related possibly HPFP related or another fueling issue that only becomes apparent in the higher RPM range when fuel demand increases.
At this point I’m trying to avoid continuing to throw random parts at the car and would really appreciate any advice from people familiar with the M157 platform or anyone who has experienced something similar. Please ask me any question's if needed! Im Stressed!
What are your Hi/Lo fuel PRESSURES?
> Running chassis VOLTAGE...:
regulated above 12.6V ??
or below 12.3V ??
CTEK float... great ?
> Next.. confirm your Banks FUEL TRIMS:
LTFT 1+2 at hot idle.
> Beyond that...
whole chassis scan for collateral bus disruptions.
Last edited by CaliBenzDriver; May 12, 2026 at 07:42 PM.
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Joined: Feb 2012
Posts: 2,617
Likes: 1,214
From: Phoenix
222 S-65
OP also look long and hard at the charge coolant pump. Intake air temps go way up and what happens? The electronics cut boost to keep it from blowing up. When are charge temps going to be highest? High RPMs with full load.
Super Member
Joined: Feb 2015
Posts: 616
Likes: 102
From: Canada
2019 911 GTS / 2016 X3 / 2015 E63s / 1993 RX-7
Are your intake hoses collapsing or torn?
That was the cause for me to have the car just fall on its face at WOT in 3rd/4th gear.
Was a simple fix and the cheapest one at that. It happened 2x to me, I was happening to be changing the oil that weekend and noticed the hose on the the driver's side was torn when changing the filter.
Completely unrelated this also happened to be on my RX-7 with the intake hoses collapsing under load. Just checking under the hood, the hoses appeared normal, but it was not uncommon on that platform.
That was the cause for me to have the car just fall on its face at WOT in 3rd/4th gear.
Was a simple fix and the cheapest one at that. It happened 2x to me, I was happening to be changing the oil that weekend and noticed the hose on the the driver's side was torn when changing the filter.
Completely unrelated this also happened to be on my RX-7 with the intake hoses collapsing under load. Just checking under the hood, the hoses appeared normal, but it was not uncommon on that platform.
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