Common w204 fault??

JoeyM88

Active Member
Joined
Jan 19, 2015
Messages
94
Car
Mercedes C350 Sport
Had my 2010 c350 serviced at an indy today. They rang an hour after i dropped it offand said they had done a health check on the car before the service and spotted a common fault in the c class. The rear wiring loom starts to melt on either side apparently. They quoted 102 per side to fix it

Is this common?
 

Ted

MB Enthusiast
Joined
Feb 26, 2004
Messages
5,847
Location
Bourton on Dunsmore
Car
SLC 250D AMG Line, Yamaha XVS 1100, Jeep Renegade
Yes, I've heard of this.
The earth (brown) wire and connection isn't really up to the job of carrying the current and melts/oxidises at the connector - you should be able to check this yourself.
Personally on a six year old car, I would probably have a go at sorting this myself - see if you can run another wire directly (soldered) from the cluster common to a good earth.
A decent auto electrician would probably do it for under half the cost.
On the other hand if you want to keep it original...
 
OP
OP
JoeyM88

JoeyM88

Active Member
Joined
Jan 19, 2015
Messages
94
Car
Mercedes C350 Sport
Yer I would rather do it myself and if i got stuck there is an auto electric by me who is cery good.

I just thought I'd check as ive been on here pretty much every other day since just before i bought the car in Jan 2015 and had never come across it.

Thanks for your help I'll put it on the to do list
 

ash59fifty-uk

MB Enthusiast
Joined
Aug 9, 2015
Messages
3,746
Location
The shire
Car
W204 C63, Ford Transit
This is common, there's a lot of cases on the US forum
 

kam05

Active Member
Joined
Feb 16, 2011
Messages
265
Car
C220CDI Sport (COMAND) W204
Common issue on the w204. Mine had the wiring replaced by the local MB dealer when my car went in for a recent summer health check. MB dealer put a warranty claim to MBUK so didn't cost me a penny in repairs.

Mines a 57 plate c220cdi Sport.
 

190

MB Enthusiast
Joined
Mar 4, 2015
Messages
3,295
Location
Cheshire
Car
2009 W204 C180K
It's common enough in the US that it's been the subject of a safety recall. No recall anywhere else that I've heard of.

As the brake lights are the biggest current draw I suspect the problem will occur to cars that are routinely run with the side lights on and also held for extended periods at a stop with the brake lights on. That's something I'm avoiding for now until I add a supplementary earth wire.
 

grober

MB Master
Joined
Jun 22, 2003
Messages
28,358
Location
Perth, Scotland
Car
W204 C200CDI Estate
I think the brake lights come on when you use the brake "hold" function so you could be sitting at the lights for quite some time with the brake lights on without your foot on the pedal??
 

Yugguy

MB Enthusiast
Joined
Apr 6, 2016
Messages
2,256
Location
Rugby UK
Car
W204 C220CDI Elegance with Comand
There's a few vids on youtube on how to replace with a sturdier wire.

I checked mine when I got the car back in March but couldn't see any signs of browning or burning.
 
OP
OP
JoeyM88

JoeyM88

Active Member
Joined
Jan 19, 2015
Messages
94
Car
Mercedes C350 Sport
Thanks for the replies and info. You would imagine if a recall has been issued in America then it should be worldwide.
 

190

MB Enthusiast
Joined
Mar 4, 2015
Messages
3,295
Location
Cheshire
Car
2009 W204 C180K
MB did a recall in the US only after they were forced to by owners lobbying the NHTSA saying the rear light failure was a safety issue.

Everywhere else they seem to think they can make a very basic ohms law design error and not own up to it or stand by it.
 

pcctech

New Member
Joined
Mar 15, 2016
Messages
10
Car
mere c180cgi blue efficiency
Had my 2010 c350 serviced at an indy today. They rang an hour after i dropped it offand said they had done a health check on the car before the service and spotted a common fault in the c class. The rear wiring loom starts to melt on either side apparently. They quoted 102 per side to fix it

Is this common?
try this youtube video, explains the fault and how to easily convert the earth connection, https://www.youtube.com/watch?v=yBeKlptAnHM, hope this helps.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top Bottom