U0155 error code - what to do?
Thread Starter
Member
Joined: Dec 2021
Posts: 112
Likes: 8
From: Newcastle NSW
2007 W211 E280
U0155 error code - what to do?
Hi
Just went into my garage to start my car and it started - but then I noticed no tacho and then the whole dash went blank.
But I did see the CEL on. So I grabbed my scanner from inside and connected it. Came back with a U0155 error - Lost Communication with Instrument Panel Control (IPC) Module
Where to go from here? The problems are intermittent. The display inside the speedo works. Then it goes. Then the car won't start. Then it WILL start. Then all the idiot lights show. Then they don't!!
I'm thinking battery. If it were a fuse, nothing would work! But I suspect a battery because of the intermittent problems. Thoughts?
Just went into my garage to start my car and it started - but then I noticed no tacho and then the whole dash went blank.
But I did see the CEL on. So I grabbed my scanner from inside and connected it. Came back with a U0155 error - Lost Communication with Instrument Panel Control (IPC) Module
Where to go from here? The problems are intermittent. The display inside the speedo works. Then it goes. Then the car won't start. Then it WILL start. Then all the idiot lights show. Then they don't!!
I'm thinking battery. If it were a fuse, nothing would work! But I suspect a battery because of the intermittent problems. Thoughts?
Thread Starter
Member
Joined: Dec 2021
Posts: 112
Likes: 8
From: Newcastle NSW
2007 W211 E280
UPDATE: Just checked the main battery with a multimeter. Stationary: 12.1V With engine idling: 14.1V
My scanner can do special MB stuff so off to the garage I go to see what I can find...
My scanner can do special MB stuff so off to the garage I go to see what I can find...
Thread Starter
Member
Joined: Dec 2021
Posts: 112
Likes: 8
From: Newcastle NSW
2007 W211 E280
Well, when I go to check the instrument cluster, I get no errors found. BUT when I check other modules with my scanner, I get errors with the Air Conditioning system, errors with the transmission talking to the CGW etc
So, I'm thinking a faulty Central Gateway module. Has anyone ever had similar problems and replaced/reprogrammed the Central Gateway module and solved such issues?
So, I'm thinking a faulty Central Gateway module. Has anyone ever had similar problems and replaced/reprogrammed the Central Gateway module and solved such issues?
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Joined: Feb 2014
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From: MA
2008 E350 4Matic, 2011 E350 4matic
Well, when I go to check the instrument cluster, I get no errors found. BUT when I check other modules with my scanner, I get errors with the Air Conditioning system, errors with the transmission talking to the CGW etc
So, I'm thinking a faulty Central Gateway module. Has anyone ever had similar problems and replaced/reprogrammed the Central Gateway module and solved such issues?
So, I'm thinking a faulty Central Gateway module. Has anyone ever had similar problems and replaced/reprogrammed the Central Gateway module and solved such issues?
Thread Starter
Member
Joined: Dec 2021
Posts: 112
Likes: 8
From: Newcastle NSW
2007 W211 E280
What I'm going to do though, is get a proper Mercedes Benz Star Diagnostic check. There is a local independent Mercedes mechanic with the Star Diagnostic system. I'm booked in for next Tuesday to let him diagnose my car. Cost? About half an hours work or AUD$50.
Sure beats the local Mercedes Benz dealer!! They wanted $255 per hour for diagnosis! And next available time would of been early next year!!! I will post back with the results.
Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,796
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
crappy GND
That diagnostic fee sounds really good.
I bet this issue has everything to do with poor grounding connections causing unstable power supply to major modules...
I bet this issue has everything to do with poor grounding connections causing unstable power supply to major modules...
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Joined: May 2021
Posts: 2,524
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Any moisture in the car? Humid carpet? Wiring under the footwelll both sides do not like water that much.
http://www.peachparts.com/shopforum/...-problems.html
@cetialpha5 said, clear ALL codes, run the car if possible and check again for first code, and see what pops.
http://www.peachparts.com/shopforum/...-problems.html
@cetialpha5 said, clear ALL codes, run the car if possible and check again for first code, and see what pops.
Last edited by JCM_MB; Nov 6, 2022 at 12:25 AM.
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Thread Starter
Member
Joined: Dec 2021
Posts: 112
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From: Newcastle NSW
2007 W211 E280
Well, I had the car scanned with the STAR diagnosis and a number of codes came back, pretty much relating to bad communication with the CGW module. The mechanic there cleared all the codes to see what would pop up in the future.
So, yesterday I had an auto electrician near me check out the CGW module and fit a throttle controller. He reported that the CGW module was in excellent condition and no signs of corrosion or moisture.
Now on my way home I stopped at my fathers house for lunch. After that I got into my car and started it up, then the problems arose again. This time no dash electronics, no AC or fan, no power windows and no indicators. Car ran fine. I drove it home and left it in the garage.
Today - same issue. Should I get the car scanned again or does anyone have any ideas?
So, yesterday I had an auto electrician near me check out the CGW module and fit a throttle controller. He reported that the CGW module was in excellent condition and no signs of corrosion or moisture.
Now on my way home I stopped at my fathers house for lunch. After that I got into my car and started it up, then the problems arose again. This time no dash electronics, no AC or fan, no power windows and no indicators. Car ran fine. I drove it home and left it in the garage.
Today - same issue. Should I get the car scanned again or does anyone have any ideas?
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MBWorld Fanatic!
Joined: May 2021
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
I would scan it again . If the communication errors are back, there is definitely something loose, or with high electrical resistance. @CaliBenzDriver suggested poor grounding, and I would suggest the same.
If I recall correctly, there is a CAN bus connection on the passenger side. Do not recall if under the glove compartment, or under the foot well. I would check for a bad connection, damage wired, or moisture in the area.
Here is a short video with a simple summary of how the CAN bus works, no specifics but a "bird eye view" of what it does.
It could also be an intermittent contact from the IC cluster. Corroded contacts, loose connection and hopefully NOT a bad cluster.
. If the communication errors are back, there is definitely something loose, or with high electrical resistance. @CaliBenzDriver suggested poor grounding, and I would suggest the same.If I recall correctly, there is a CAN bus connection on the passenger side. Do not recall if under the glove compartment, or under the foot well. I would check for a bad connection, damage wired, or moisture in the area.
Here is a short video with a simple summary of how the CAN bus works, no specifics but a "bird eye view" of what it does.
It could also be an intermittent contact from the IC cluster. Corroded contacts, loose connection and hopefully NOT a bad cluster.
Last edited by JCM_MB; Nov 17, 2022 at 09:42 AM.
Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,796
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
scanning has limitations...
OBD scanning is the fastest way to collect valuable clues and still keep your hands clean. However the vagueness of codes has serious limitations.
Troubleshooting:
To help troubleshoot this pickle you want to match clues from...:
The outcome is a more focused translation of what the problem/solution may be. Luckily these cars are really well assembled. They disfunction as designed.
Reverse logic:
The absence of fault code matched with driving scenarios may provide clues about what the problem is not. That is not the best way to go but I understand limitations restrict options.
Practically:
Oxidized "Painted GND" help glitch modules into crazy disfunctioning. Battery reboot temporarily helps reset the soft-crash condition.
Now or later:
Cleaning ALL GND helps eliminate this class of unecessary chaos. In the absence of fix, power surging issues can progress into degrading positive feed side from SAM's. These cars react extremely well to GND therapy.
Better electricals help lower CAN retransmit traffic thereby directly increasing the whole chassis performance.
Troubleshooting:
To help troubleshoot this pickle you want to match clues from...:
- the driver's scenarios of the issue
- the comprehensive list of OBD codes
- the physical inspection of the vehicle
The outcome is a more focused translation of what the problem/solution may be. Luckily these cars are really well assembled. They disfunction as designed.
Reverse logic:
The absence of fault code matched with driving scenarios may provide clues about what the problem is not. That is not the best way to go but I understand limitations restrict options.
Practically:
Oxidized "Painted GND" help glitch modules into crazy disfunctioning. Battery reboot temporarily helps reset the soft-crash condition.
Now or later:
Cleaning ALL GND helps eliminate this class of unecessary chaos. In the absence of fix, power surging issues can progress into degrading positive feed side from SAM's. These cars react extremely well to GND therapy.
Better electricals help lower CAN retransmit traffic thereby directly increasing the whole chassis performance.
Last edited by CaliBenzDriver; Nov 17, 2022 at 05:11 PM.
Thread Starter
Member
Joined: Dec 2021
Posts: 112
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From: Newcastle NSW
2007 W211 E280
FIXED IT!
You wouldn't believe what was the problem.
Weak/flat battery in the key fob. I kid you not.
About 3 months ago I bought a third party key fob for my E280 from a local key cutter for AUD$300. Yes it works. But this morning I could not even start the car. Still the same problem - no dash, no AC, no power windows etc.
So, on a hunch I decided to try my original MB key fob - started first thing. "You've got to be kidding me" I thought. Nope, that was the issue.
The third party key fob with a weak battery was sending weak signals to the ECU and making all those "problems" appear. You live, you learn!!!
You wouldn't believe what was the problem.
Weak/flat battery in the key fob. I kid you not.
About 3 months ago I bought a third party key fob for my E280 from a local key cutter for AUD$300. Yes it works. But this morning I could not even start the car. Still the same problem - no dash, no AC, no power windows etc.
So, on a hunch I decided to try my original MB key fob - started first thing. "You've got to be kidding me" I thought. Nope, that was the issue.
The third party key fob with a weak battery was sending weak signals to the ECU and making all those "problems" appear. You live, you learn!!!
MBWorld Fanatic!
Joined: May 2021
Posts: 2,524
Likes: 2,042
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
That means, the statement of ALL batteries must be charged/ good condition must include: main, aux and keyfob's when dealing with starting issues.
Super Member
Joined: Jul 2021
Posts: 528
Likes: 157
2006 E280
FIXED IT!
You wouldn't believe what was the problem.
Weak/flat battery in the key fob. I kid you not.
About 3 months ago I bought a third party key fob for my E280 from a local key cutter for AUD$300. Yes it works. But this morning I could not even start the car. Still the same problem - no dash, no AC, no power windows etc.
So, on a hunch I decided to try my original MB key fob - started first thing. "You've got to be kidding me" I thought. Nope, that was the issue.
The third party key fob with a weak battery was sending weak signals to the ECU and making all those "problems" appear. You live, you learn!!!
You wouldn't believe what was the problem.
Weak/flat battery in the key fob. I kid you not.
About 3 months ago I bought a third party key fob for my E280 from a local key cutter for AUD$300. Yes it works. But this morning I could not even start the car. Still the same problem - no dash, no AC, no power windows etc.
So, on a hunch I decided to try my original MB key fob - started first thing. "You've got to be kidding me" I thought. Nope, that was the issue.
The third party key fob with a weak battery was sending weak signals to the ECU and making all those "problems" appear. You live, you learn!!!
I thought it would be a great idea to have spare batteries with the car, but it seems that they loose their juice over a couple of years.
Last edited by Heguli; Nov 18, 2022 at 01:00 PM.
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
I change my keyless go batteries all the time, sometimes it seems like it's every 4-8 months depending on how much use it gets. Even the spare ones gets changed too as they seem to die on their own even if you don't use them. That's why I always get a set of 10 or 20 as I use 6 a time for 4 key fobs. Don't want more as the longer they sit, the more the voltage drops. You could also always just put the key in the ignition and it doesn't matter if the key fob battery is dead, the rfid chip in the keyfob doesn't need any battery power when putting it into the ignition.
