28-tcs c1255 c
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
Likes: 37
From: North Carolina
28-tcs c1255 c
Finally came back to a C5 for a more focused track car and a lot cheaper than my previous S550. Sold my first C5 years ago. Just picked up a 99’ with the dreaded 1255 code.
My understanding is if I take my car to Chevy they can hook up a Tech 2 scanner and give me more detail than my DIC gives. Is that correct? I’d like to rule out all possibilities before I try to spend $2000+ for a new to me unit.
I think I’ve read almost every thread on this and it almost always doesn’t have an answer in the thread.
thanks
My understanding is if I take my car to Chevy they can hook up a Tech 2 scanner and give me more detail than my DIC gives. Is that correct? I’d like to rule out all possibilities before I try to spend $2000+ for a new to me unit.
I think I’ve read almost every thread on this and it almost always doesn’t have an answer in the thread.
thanks
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
Likes: 37
From: North Carolina
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
Likes: 37
From: North Carolina
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,540
Likes: 4,020
From: Cape Coral, Florida
These 2 characters after the DTC with a scan tool helps “engineering” determine the cause of that internal malfunction…the average owner will just replace the EBCM…I see no mention of these characters in OEM Service Info…don’t know where this member got that info from ??
Last edited by C5 Diag; May 22, 2023 at 08:52 PM.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
Likes: 37
From: North Carolina
These 2 characters after the DTC with a scan tool helps “engineering” determine the cause of that internal malfunction…the average owner will just replace the EBCM…I see no mention of these characters in OEM Service Info…don’t know where this member got that info from ??
Instructor
Joined: Aug 2022
Posts: 243
Likes: 93
From: Ashburn, VA
I am not sure where they found it but essentially it seems like those 2 characters "sub codes" could help diagnose the problem further before jumping into buying a new EBCM. As of right now the only V Code EBCMs I've found are $2300 and I'm wondering if it is even worth replacing. Seems like a lot of the track guys are disabling their ABS anyway (ABS is the only feature I really care about in this system since it is not a dedicated track car)
I've never heard of any weekend racers prioritizing any system or module that will take away how they want to control the car...braking or wheel spin. As I often remind folks...millions of Americans got along fine without ABS and traction control for many moons lol These features have made us WORSE drivers as a result (my 2cent opinion).C1255 - DOA EBCM.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
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From: North Carolina
I was kind of thinking this myself lol. Anyone I know who SCCA's in a road/track car typically has ANY'control turned off while lap'ing the course. If its a dedicated track car...spend the $2,300 on suspension, tires, and safety gear. ABS and traction control are great safety items for the street when Granpa gets a little frisky leaving cars and coffee I've never heard of any weekend racers prioritizing any system or module that will take away how they want to control the car...braking or wheel spin. As I often remind folks...millions of Americans got along fine without ABS and traction control for many moons lol These features have made us WORSE drivers as a result (my 2cent opinion).
C1255 - DOA EBCM.
I've never heard of any weekend racers prioritizing any system or module that will take away how they want to control the car...braking or wheel spin. As I often remind folks...millions of Americans got along fine without ABS and traction control for many moons lol These features have made us WORSE drivers as a result (my 2cent opinion).C1255 - DOA EBCM.
you’re not wrong, I agree all these features make us lazier. I sold my S550 because it was so numb. I guess I’m getting what I asked for if I now have no Nannie’s lol.
already have wheels and tires, I guess the $2300 can go to brakes and seats
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From: Ashburn, VA
An S550 is no slouch...and ESP can be turned off to reclaim some feeling and driver control. But by and large...benz's handle like the were designed to...doing 140 on the Autobahn with A/C going and some Vivaldi coming through the Bose system. I swear my AMG is the only car where you can be going 100 and it feels like your doing 35 mph lol Its hard to explain to someone who hasnt owned a sporty or luxury benz...but with that S550 im sure you can relate 
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
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From: North Carolina
Well I'm a certified Benz ***** An S550 is no slouch...and ESP can be turned off to reclaim some feeling and driver control. But by and large...benz's handle like the were designed to...doing 140 on the Autobahn with A/C going and some Vivaldi coming through the Bose system. I swear my AMG is the only car where you can be going 100 and it feels like your doing 35 mph lol Its hard to explain to someone who hasnt owned a sporty or luxury benz...but with that S550 im sure you can relate
An S550 is no slouch...and ESP can be turned off to reclaim some feeling and driver control. But by and large...benz's handle like the were designed to...doing 140 on the Autobahn with A/C going and some Vivaldi coming through the Bose system. I swear my AMG is the only car where you can be going 100 and it feels like your doing 35 mph lol Its hard to explain to someone who hasnt owned a sporty or luxury benz...but with that S550 im sure you can relate i do like the Mercedes S550 though 🤤 love that VIP feeling
Thread Starter
Instructor
Joined: Dec 2013
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From: North Carolina
Updated Codes
So after cleaning grounds and resetting codes I still have the C1255. However, I took it for a drive and got 3 new ones.
C1225, C1226, C1227 - Excessive wheel speed variations on 3 out of 4 wheels. Tested sensors and they’re showing AC Voltage when spinning and proper OHM’s … What would be the next step here?
i am running 18x10.5 squared on this car.
C1225, C1226, C1227 - Excessive wheel speed variations on 3 out of 4 wheels. Tested sensors and they’re showing AC Voltage when spinning and proper OHM’s … What would be the next step here?
i am running 18x10.5 squared on this car.
Thread Starter
Instructor
Joined: Dec 2013
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From: North Carolina
Maybe the bigger question here is— Is C1255 causing C1225/226/227 or are codes C1225/226/227 causing C1255?
Either the EBCM can’t read those 3 because of internal malfunction or the speed sensors are causing the EBCM to malfunction?
Either the EBCM can’t read those 3 because of internal malfunction or the speed sensors are causing the EBCM to malfunction?
Instructor
Joined: Aug 2022
Posts: 243
Likes: 93
From: Ashburn, VA
So after cleaning grounds and resetting codes I still have the C1255. However, I took it for a drive and got 3 new ones.
C1225, C1226, C1227 - Excessive wheel speed variations on 3 out of 4 wheels. Tested sensors and they’re showing AC Voltage when spinning and proper OHM’s … What would be the next step here?
i am running 18x10.5 squared on this car.
C1225, C1226, C1227 - Excessive wheel speed variations on 3 out of 4 wheels. Tested sensors and they’re showing AC Voltage when spinning and proper OHM’s … What would be the next step here?
i am running 18x10.5 squared on this car.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 204
Likes: 37
From: North Carolina
If its 1255 its dead dude lol The code literally translates into "Internal Malfunction" 3 out of 4 wheel sensor out of wack should be evidence of that (unless you have 3 bad wheel sensors which I doubt). I say dead in the sense of...garbage in...garbage out. It may still be communicating...but its communicating garbage. If you do decide to go the used EBCM route...i'd try to find it local so you could try before you buy (or get a guarantee). Give ABSfixer.com a call and maybe they have some other steps you could take. Maybe they will make exception on pre-2001 box but, by and large, nobody supports 2001 and below EBCM's.
Instructor
Joined: Aug 2022
Posts: 243
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From: Ashburn, VA
Just check the FB marketplace listings every now and then for 99's. Wrecked ones come up pretty frequently you may be able to scavenge a working unit for for cheap. I know its annoying as F' when the dash screams "Service traction Control" and "Service ABS" so I can empathies with you.
Melting Slicks
Joined: Sep 2021
Posts: 2,555
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This thread reports someone was able to fix the unit but I don't think the owner has ever followed up with a definitive 'yes, the fix worked'.
https://www.corvetteclub.org.uk/thre...lp.3525/page-4
https://www.corvetteclub.org.uk/thre...lp.3525/page-4