Conductor Plate Time?
#1
Senior Member
Thread Starter
Conductor Plate Time?
2013 C300 sport 4Matic with 67k, started having intermittent ABS/traction/stability control faults that became very consistent. Multiple codes for implausible values on the right front ABS sensor so I replaced it. With the new sensor the car goes into limp mode, still showing the code for right front and front ABS sensors but now also adding 720 and 721 for implausible transmission output speed when compared to wheel speed sensors. Replaced the left front ABS sensor just to be comprehensive but the codes remain after reset and the car quickly goes into limp mode.
This seems like a pretty classic example of a 722.9 conductor plate failure, correct? Any other things I might be missing? Any recommendations for a shop to rebuild it? Looks like there are several options.
This seems like a pretty classic example of a 722.9 conductor plate failure, correct? Any other things I might be missing? Any recommendations for a shop to rebuild it? Looks like there are several options.
#2
Super Member
2013 C300 sport 4Matic with 67k, started having intermittent ABS/traction/stability control faults that became very consistent. Multiple codes for implausible values on the right front ABS sensor so I replaced it. With the new sensor the car goes into limp mode, still showing the code for right front and front ABS sensors but now also adding 720 and 721 for implausible transmission output speed when compared to wheel speed sensors. Replaced the left front ABS sensor just to be comprehensive but the codes remain after reset and the car quickly goes into limp mode.
This seems like a pretty classic example of a 722.9 conductor plate failure, correct? Any other things I might be missing? Any recommendations for a shop to rebuild it? Looks like there are several options.
This seems like a pretty classic example of a 722.9 conductor plate failure, correct? Any other things I might be missing? Any recommendations for a shop to rebuild it? Looks like there are several options.
#3
MBWorld Fanatic!
^^^ Yes which brand were the replacement parts? Did you replace both sensors at the same time, or did you replace the front right sensor and were still getting codes so then replaced the left sensor?
What are the codes it is showing?
Which specific obd reader was used?
What are the codes it is showing?
Which specific obd reader was used?
#4
Senior Member
Thread Starter
Bremi sensors, they were the only German made ones I could find on short notice. Replaced the right front first, had the first limp mode and still showed codes for the right front and front sensors so I replaced front left. Code reader is a higher end Autel from probably 8 years ago, the live data isn’t working so I have a Mercedes specific Launch Elite delivering today. I plan to clear everything with the new reader and go for a drive to see what triggers. I also want to make sure the wheel speed sensors are reading accurately using the live data.
Full code list: 0720, 0721, C11100,
C111200, C327100, C322200, 511100, 726600, 511200, 727100, 727300, 722300, C326600, C322300. Some of these my reader won’t decipher because they are Mercedes specific, so the new one should remedy that.
Full code list: 0720, 0721, C11100,
C111200, C327100, C322200, 511100, 726600, 511200, 727100, 727300, 722300, C326600, C322300. Some of these my reader won’t decipher because they are Mercedes specific, so the new one should remedy that.
Last edited by onewhippedpuppy; 05-30-2024 at 02:07 PM.
#5
MBWorld Fanatic!
I came across this thread. They mention using Bremi sensors and still had the issue, seems switching to Mercedes brand solved it.
https://mbworld.org/forums/m-class-w...ompatible.html
https://mbworld.org/forums/m-class-w...ompatible.html
#6
Senior Member
Thread Starter
I came across this thread. They mention using Bremi sensors and still had the issue, seems switching to Mercedes brand solved it.
https://mbworld.org/forums/m-class-w...ompatible.html
https://mbworld.org/forums/m-class-w...ompatible.html
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#8
Senior Member
Thread Starter
I’ve been driving German cars almost exclusively for close to 30 years and always DIY, and can’t recall having a brand specific issue like this before. Before throwing any more parts at it, I’ll do an another scan and look at live data tonight.
#9
Super Member
Oil pressure and temp sensors (simple switches), sure. For anything ABS, camshaft/crankshaft sensors (hall effect), the output signal needs to be more precise, i.e. per MB spec. They're tougher to reverse-engineer for third part manufacturers.
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#12
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2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
#13
Senior Member
Thread Starter
Cleared codes with my snazzy new code reader and went for a drive. The ABS lights popped up immediately but it did not go into limp mode. Read the codes afterwards and all were for the right front wheel speed sensor. C003408, U140A, C111600, C111100, C327100. So I’ll try replacing the wheel speed sensors with OEM and report back.
#14
Senior Member
Thread Starter
Worth noting there are several companies that will rebuild your conductor plate for about $400, eliminating the need to reprogram the TCU. I did this with a G500 years ago.
#15
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2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)