SL/R230: Temporary Power Loss in SL 55 AMG 2002
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SL 55 AMG 2002 & Etron GT
Temporary Power Loss in SL 55 AMG 2002
Hello everyone I am a rookie when it comes to car engines. Would really appreciate any help.
My SL 55 AMG 2002 has done about 16k miles. I am facing two problems.
Firstly temporary power loss at random. I would say around 10% of the time when I push the pedal down it does not accelerate as fast as it is supposed to. If I stop the car turn it off and then on again the problem resolves itself. Any idea what could be causing this? It gets fixed automatically upon restart. I tried a new accelerator pedal thinking that's the problem but it did not solve the problem.
Secondly the fuel consumption is almost double of what it should be. All regular maintenance has been done recently. I feel both the problems may be connected.
Thank you
My SL 55 AMG 2002 has done about 16k miles. I am facing two problems.
Firstly temporary power loss at random. I would say around 10% of the time when I push the pedal down it does not accelerate as fast as it is supposed to. If I stop the car turn it off and then on again the problem resolves itself. Any idea what could be causing this? It gets fixed automatically upon restart. I tried a new accelerator pedal thinking that's the problem but it did not solve the problem.
Secondly the fuel consumption is almost double of what it should be. All regular maintenance has been done recently. I feel both the problems may be connected.
Thank you
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
Hello everyone I am a rookie when it comes to car engines. Would really appreciate any help.
My SL 55 AMG 2002 has done about 16k miles. I am facing two problems.
Firstly temporary power loss at random. I would say around 10% of the time when I push the pedal down it does not accelerate as fast as it is supposed to. If I stop the car turn it off and then on again the problem resolves itself. Any idea what could be causing this? It gets fixed automatically upon restart. I tried a new accelerator pedal thinking that's the problem but it did not solve the problem.
Secondly the fuel consumption is almost double of what it should be. All regular maintenance has been done recently. I feel both the problems may be connected.
Thank you
My SL 55 AMG 2002 has done about 16k miles. I am facing two problems.
Firstly temporary power loss at random. I would say around 10% of the time when I push the pedal down it does not accelerate as fast as it is supposed to. If I stop the car turn it off and then on again the problem resolves itself. Any idea what could be causing this? It gets fixed automatically upon restart. I tried a new accelerator pedal thinking that's the problem but it did not solve the problem.
Secondly the fuel consumption is almost double of what it should be. All regular maintenance has been done recently. I feel both the problems may be connected.
Thank you
hope that helps,
Chris
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Joined: Dec 2008
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From: Socal, Chino
E55 2006 / CLS55 / S450 / Jag XKR2011
Sounds like there is something wrong with your charge cooling pump. Very common for the pump to fail over time. When the pump fails, car feels like normal until the IAT (intake air temp) crosses a threshold and then the ECU turns off the Supercharger pulley (clutch) and opens the bypass throttle. One way to confirm this is to monitor your IAT using an app like "torque". If you replace it (which you likely will), use the bosch 010 pump (0392022010, upgraded version of original). You should be able to find it for $110 - $150 https://www.autohausaz.com/pn/0392022010
hope that helps,
Chris
hope that helps,
Chris
Member
Joined: Sep 2018
Posts: 115
Likes: 7
From: Dallas
2005 SL65 AMG, Motorcycle
I had this problem last year. zero power or 1% power to the wheels '05 SL65 100k miles. I replaced the gas pedal DIY and still had the same power loss problem so I took it to my indy to diagnose.
my indy found metal shavings in trans oil pan so we replaced the trans with a used one low mileage.. he suggested this would be a better alternative than trying to track down the issue within the trans. usually good service from them but they were off on this problem.
imagine my shock when I was dead on the side of the road a week later still no power to the wheels!
I decided to pony-up and take it to the dealer the next time. turns out the TCM transmission control module ($2K) was going bad they replaced it and ive been great ever since.
my indy found metal shavings in trans oil pan so we replaced the trans with a used one low mileage.. he suggested this would be a better alternative than trying to track down the issue within the trans. usually good service from them but they were off on this problem.
imagine my shock when I was dead on the side of the road a week later still no power to the wheels!
I decided to pony-up and take it to the dealer the next time. turns out the TCM transmission control module ($2K) was going bad they replaced it and ive been great ever since.
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SL 55 AMG 2002 & Etron GT
Thanks for the reply.
My problem is not 1% power. The problem is that the supercharger goes offline. You still have power but not the full power. Problem fixes immediately when car is turned off and on.
My problem is not 1% power. The problem is that the supercharger goes offline. You still have power but not the full power. Problem fixes immediately when car is turned off and on.
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Member
Joined: Sep 2018
Posts: 115
Likes: 7
From: Dallas
2005 SL65 AMG, Motorcycle
my issue would be fixed after restarting when stalled on the road. eventually restarting did not resolve the issue
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SL 55 AMG 2002 & Etron GT
The car never stalls. Just the turbo/supercharger goes offline. Even without that it still has a lot of power but not equivalent to the full HP that come with supercharger running.
Will have a look at the transmission module as well
Will have a look at the transmission module as well
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
I just skimmed through and can't find ANY of indication that you have taken these steps, so I will ask you directly,
Have you checked for stored codes?
Have you checked your IAT?
Are you actually monitoring boost? or are you just assuming that the supercharger is dis-engaging?
There are only 2 things that come to mind that shut off the supercharger ... High IATs or malfunctioning bypass throttle. ... the second will store a code.
Please report back with codes or that you have checked them and have found none.
Also, please indicate HOW you are confirming that the supercharger is not working (monitoring boost? monitoring clutch signal?)
How have you confirmed that your charge cooling is working? (have you observed steady flow when the pump is running?)
Have you checked your IATs ?
Have you checked for stored codes?
Have you checked your IAT?
Are you actually monitoring boost? or are you just assuming that the supercharger is dis-engaging?
There are only 2 things that come to mind that shut off the supercharger ... High IATs or malfunctioning bypass throttle. ... the second will store a code.
Please report back with codes or that you have checked them and have found none.
Also, please indicate HOW you are confirming that the supercharger is not working (monitoring boost? monitoring clutch signal?)
How have you confirmed that your charge cooling is working? (have you observed steady flow when the pump is running?)
Have you checked your IATs ?
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
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From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
now that I think about, I seem to recall that early 2002s had NO bypass throttle. not sure if your sl55 would or wouldn't have it (or is those cars might have had a different set of rules for cutting boost since there was no bypass throttle) Hmmm
Thread Starter
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SL 55 AMG 2002 & Etron GT
I have a mechanic who is helping me as I am myself not very educated/capable in car engine mechanics.
We have checked for stored codes. The recurring code before changing the charge coolant pump was:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We changed both the charge cooling pump AND the secondary air intake pump
The few times we tried to monitor we did not have the said power loss therefore could not actually check if supercharger is dis-engaging. This assessment is from actually driving the car and feeling the boost in correlation with the RPM. The power loss is not on every drive. Sometimes it will come within first 2 minutes of driving the car and other times it won't come for days.
We replaced the charge cooling pump with a brand new one as recommended by this forum. The flow is steady when pump is running and we checked the Intake Air temperature few days back and there seemed to be no issue in air temperatures. All seemed in normal ranges.
Let me check all the things you mentioned again and get back to you with most recent data. As data I am giving you is before we changed the charge cooling pump. We changed the pump few days back and I have been road testing it since then to see if the problem reoccurs. Just in the past 2 days I have found that the problem is still there. I will connect the scanner today and get back to you with what codes are showing up now.
We have checked for stored codes. The recurring code before changing the charge coolant pump was:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We changed both the charge cooling pump AND the secondary air intake pump
The few times we tried to monitor we did not have the said power loss therefore could not actually check if supercharger is dis-engaging. This assessment is from actually driving the car and feeling the boost in correlation with the RPM. The power loss is not on every drive. Sometimes it will come within first 2 minutes of driving the car and other times it won't come for days.
We replaced the charge cooling pump with a brand new one as recommended by this forum. The flow is steady when pump is running and we checked the Intake Air temperature few days back and there seemed to be no issue in air temperatures. All seemed in normal ranges.
Let me check all the things you mentioned again and get back to you with most recent data. As data I am giving you is before we changed the charge cooling pump. We changed the pump few days back and I have been road testing it since then to see if the problem reoccurs. Just in the past 2 days I have found that the problem is still there. I will connect the scanner today and get back to you with what codes are showing up now.
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
I have a mechanic who is helping me as I am myself not very educated/capable in car engine mechanics.
We have checked for stored codes. The recurring code before changing the charge coolant pump was:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We changed both the charge cooling pump AND the secondary air intake pump
The few times we tried to monitor we did not have the said power loss therefore could not actually check if supercharger is dis-engaging. This assessment is from actually driving the car and feeling the boost in correlation with the RPM. The power loss is not on every drive. Sometimes it will come within first 2 minutes of driving the car and other times it won't come for days.
We replaced the charge cooling pump with a brand new one as recommended by this forum. The flow is steady when pump is running and we checked the Intake Air temperature few days back and there seemed to be no issue in air temperatures. All seemed in normal ranges.
Let me check all the things you mentioned again and get back to you with most recent data. As data I am giving you is before we changed the charge cooling pump. We changed the pump few days back and I have been road testing it since then to see if the problem reoccurs. Just in the past 2 days I have found that the problem is still there. I will connect the scanner today and get back to you with what codes are showing up now.
We have checked for stored codes. The recurring code before changing the charge coolant pump was:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We changed both the charge cooling pump AND the secondary air intake pump
The few times we tried to monitor we did not have the said power loss therefore could not actually check if supercharger is dis-engaging. This assessment is from actually driving the car and feeling the boost in correlation with the RPM. The power loss is not on every drive. Sometimes it will come within first 2 minutes of driving the car and other times it won't come for days.
We replaced the charge cooling pump with a brand new one as recommended by this forum. The flow is steady when pump is running and we checked the Intake Air temperature few days back and there seemed to be no issue in air temperatures. All seemed in normal ranges.
Let me check all the things you mentioned again and get back to you with most recent data. As data I am giving you is before we changed the charge cooling pump. We changed the pump few days back and I have been road testing it since then to see if the problem reoccurs. Just in the past 2 days I have found that the problem is still there. I will connect the scanner today and get back to you with what codes are showing up now.
HTH,
Chris
Thread Starter
Newbie
Joined: Dec 2021
Posts: 13
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SL 55 AMG 2002 & Etron GT
I just skimmed through and can't find ANY of indication that you have taken these steps, so I will ask you directly,
Have you checked for stored codes?
Have you checked your IAT?
Are you actually monitoring boost? or are you just assuming that the supercharger is dis-engaging?
There are only 2 things that come to mind that shut off the supercharger ... High IATs or malfunctioning bypass throttle. ... the second will store a code.
Please report back with codes or that you have checked them and have found none.
Also, please indicate HOW you are confirming that the supercharger is not working (monitoring boost? monitoring clutch signal?)
How have you confirmed that your charge cooling is working? (have you observed steady flow when the pump is running?)
Have you checked your IATs ?
Have you checked for stored codes?
Have you checked your IAT?
Are you actually monitoring boost? or are you just assuming that the supercharger is dis-engaging?
There are only 2 things that come to mind that shut off the supercharger ... High IATs or malfunctioning bypass throttle. ... the second will store a code.
Please report back with codes or that you have checked them and have found none.
Also, please indicate HOW you are confirming that the supercharger is not working (monitoring boost? monitoring clutch signal?)
How have you confirmed that your charge cooling is working? (have you observed steady flow when the pump is running?)
Have you checked your IATs ?
The previous error showed up again:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We monitored the temperatures again while driving and while experiencing power loss. There was no indication that the Secondary Air Intake pump or Charge cooling pump were not working. They seem to be working fine.
Do you think it could be a connection with the ECU that could be at fault? Quite possibly the connection between ECU and Secondary Air intake pump?
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
So just went through everything in detail again yesterday.
The previous error showed up again:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We monitored the temperatures again while driving and while experiencing power loss. There was no indication that the Secondary Air Intake pump or Charge cooling pump were not working. They seem to be working fine.
Do you think it could be a connection with the ECU that could be at fault? Quite possibly the connection between ECU and Secondary Air intake pump?
The previous error showed up again:
P2027-0-01 Y31/1 (EGR Vacuum transducer) (P0403), short circuit to positive
We monitored the temperatures again while driving and while experiencing power loss. There was no indication that the Secondary Air Intake pump or Charge cooling pump were not working. They seem to be working fine.
Do you think it could be a connection with the ECU that could be at fault? Quite possibly the connection between ECU and Secondary Air intake pump?
Chris
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
I just looked in the Mercedes ETM, and I could not find a document that describes the SC clutch "cut-off" from excessively elevated IAT, but I did find these 2 documents that might be useful.
Senior Member
Joined: Jul 2013
Posts: 448
Likes: 48
From: Europe, but from Norway
89 SL500 Silver ,97 SL500 Carlsson 04 Mercedes SL55 AMG , 07 Mercedes SL55 AMG convertedBlack series
your intercooler pump is gone, update to Bosch 010 , 09 pumps is **** . Is probaly many that drive around with bad pump , all this older models the pump for shure is gone.
Senior Member
Joined: Jul 2013
Posts: 448
Likes: 48
From: Europe, but from Norway
89 SL500 Silver ,97 SL500 Carlsson 04 Mercedes SL55 AMG , 07 Mercedes SL55 AMG convertedBlack series
older models tells nothing ,just loose the supercharger for short time .
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SL 55 AMG 2002 & Etron GT
Thank you for the response yet again. Unfortunately my ABC has started to leak. I am in process of converting to coil over. Please give me a few days to reply to this message. We have been monitoring the IAT but not so regularly. Once the suspension is converted I will monitor the IAT regularly for a few days and get back to you with the results.
Thanks
Thanks
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Joined: Aug 2023
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Sl55
Newbie
Joined: Apr 2026
Posts: 1
Likes: 0
SLK 32 AMG
Hello there,
Do we have a solution for this?
I've been battling for one year now. Can't seem to get rid of the problem.
I even laid a bypass cable from ecu to the egr Actuator to be sure there's no short or oil in the cable
Any help is greatly appreciated!
Kind regards,
Robert
Do we have a solution for this?
I've been battling for one year now. Can't seem to get rid of the problem.
I even laid a bypass cable from ecu to the egr Actuator to be sure there's no short or oil in the cable
Any help is greatly appreciated!
Kind regards,
Robert
Newbie
Joined: Aug 2023
Posts: 2
Likes: 0
Sl55
kinda solved it
In my case it is a 100% because of the accelerator pedal, When I pedal to the metal it hits like a button and my car goes to limp mode no matter what. Same case as yours when restarted it all goes back to normal, since i cant get easy access to mercedes parts now i just kinda live with it, just dont pedal to the metal and youll be fine.
