Traction Control System code C1225
Thread Starter
Pro
Joined: Sep 2011
Posts: 720
Likes: 17
From: Whitby Ontario
Traction Control System code C1225
Recently I have had an issue on the track with my C5Z triggering this code. If it happens repeatedly I get all the warning signs "Service Traction Control System" and "Service ABS System" and the ABS system stops working. BTW I drive with the nannies off.
Had ABSFIXER look at the EBCM which was actually fine but the code comes up under section 28 of C1225 which is " RF excessive wheel speed variation".
Interesting C1222 is "RF wheel speed sensor is zero" and C1233 is "RF Wheel speed circuit open or shorted". I would have thought that these 2 codes would indicate a burnt wire or connector issue.
Does C1225 mean that the hub itself is gone? Interesting this only occurs after the hub gets hot on the track but so far I am only picking up an issue with the right front. There are no other signs of hub failure which is OE.
The warnings disappear after recycling the ignition but the code may still be present although it eventually goes away as well at least when street driven.
BTW I normally use cooling ducts but for the last event I didn't and it didn't make much difference.
Had ABSFIXER look at the EBCM which was actually fine but the code comes up under section 28 of C1225 which is " RF excessive wheel speed variation".
Interesting C1222 is "RF wheel speed sensor is zero" and C1233 is "RF Wheel speed circuit open or shorted". I would have thought that these 2 codes would indicate a burnt wire or connector issue.
Does C1225 mean that the hub itself is gone? Interesting this only occurs after the hub gets hot on the track but so far I am only picking up an issue with the right front. There are no other signs of hub failure which is OE.
The warnings disappear after recycling the ignition but the code may still be present although it eventually goes away as well at least when street driven.
BTW I normally use cooling ducts but for the last event I didn't and it didn't make much difference.
Burning Brakes
Joined: Apr 2005
Posts: 901
Likes: 1
From: Cincinnati Ohio
Recently I have had an issue on the track with my C5Z triggering this code. If it happens repeatedly I get all the warning signs "Service Traction Control System" and "Service ABS System" and the ABS system stops working. BTW I drive with the nannies off.
Had ABSFIXER look at the EBCM which was actually fine but the code comes up under section 28 of C1225 which is " RF excessive wheel speed variation".
Interesting C1222 is "RF wheel speed sensor is zero" and C1233 is "RF Wheel speed circuit open or shorted". I would have thought that these 2 codes would indicate a burnt wire or connector issue.
Does C1225 mean that the hub itself is gone? Interesting this only occurs after the hub gets hot on the track but so far I am only picking up an issue with the right front. There are no other signs of hub failure which is OE.
The warnings disappear after recycling the ignition but the code may still be present although it eventually goes away as well at least when street driven.
BTW I normally use cooling ducts but for the last event I didn't and it didn't make much difference.
Had ABSFIXER look at the EBCM which was actually fine but the code comes up under section 28 of C1225 which is " RF excessive wheel speed variation".
Interesting C1222 is "RF wheel speed sensor is zero" and C1233 is "RF Wheel speed circuit open or shorted". I would have thought that these 2 codes would indicate a burnt wire or connector issue.
Does C1225 mean that the hub itself is gone? Interesting this only occurs after the hub gets hot on the track but so far I am only picking up an issue with the right front. There are no other signs of hub failure which is OE.
The warnings disappear after recycling the ignition but the code may still be present although it eventually goes away as well at least when street driven.
BTW I normally use cooling ducts but for the last event I didn't and it didn't make much difference.
Thread Starter
Pro
Joined: Sep 2011
Posts: 720
Likes: 17
From: Whitby Ontario
Yes, I have SS lines at all 4 corners. Not sure why this would affect just the right front though.
One other point is that I had to cut the mounting tab for the ABS connectors at the hub to install the cooling ducts. Elsewhere it had been suggested that I needed to zip tie the extra length of wire from the hub very tightly (which I already thought I had done) and after the code showing up the last time, I retied the wires and I didn't throw another code but I was also very gentle with the brakes. I really didn't want the antilock function to suddenly stop while coming into turn 8 at Mosport.
One other point is that I had to cut the mounting tab for the ABS connectors at the hub to install the cooling ducts. Elsewhere it had been suggested that I needed to zip tie the extra length of wire from the hub very tightly (which I already thought I had done) and after the code showing up the last time, I retied the wires and I didn't throw another code but I was also very gentle with the brakes. I really didn't want the antilock function to suddenly stop while coming into turn 8 at Mosport.
Melting Slicks
Joined: Sep 2003
Posts: 3,031
Likes: 74
From: If you don't weigh in you don't wrestle Road America
Check the ABS jumper harness - there is a harness that goes between the chassis harness and the wheel bearing it's a little over 2 feet long. Take the one off of the LF wheel and swap it with the RF wheel, if the code changes to a "LF wheel speed variation" then you know that it's the harness. It's easy to do and "free" more or less. I've replaced at least 5 of these over the years on various customer cars.
Safety Car
Joined: Jan 2005
Posts: 3,781
Likes: 14
From: Phoenixville, PA
+1 for that suggestion. This is most likely a connector/harness issue. If the inboard harness swap doesn't fix it, there may be a problem with the wiring coming out of the hub that you may or may not be able to see.
Tech Contributor
Joined: Oct 1999
Posts: 41,063
Likes: 9,826
From: Charlotte, NC (formerly Endicott, NY)
Does this occur when you are on a bumpy surface or any type of surface? Pre -01 C5s had an issue with this type of code on bumpy surfaces. I know one well known racer who installed a toggle switch on his dash just so he could toggle the EBCM power off and on to reset it so he could maintain the ABS. It almost always occurred on a bumpy section of road/track.
Bill
Bill
Thread Starter
Pro
Joined: Sep 2011
Posts: 720
Likes: 17
From: Whitby Ontario
Does this occur when you are on a bumpy surface or any type of surface? Pre -01 C5s had an issue with this type of code on bumpy surfaces. I know one well known racer who installed a toggle switch on his dash just so he could toggle the EBCM power off and on to reset it so he could maintain the ABS. It almost always occurred on a bumpy section of road/track.
Bill
Bill
My real question is, does code C1225 likely indicate a hub sensor issue vs the C1222 or C1233 codes which seem to indicate an electrical disconnect? I will try the flipping the harness or potentially just buying a new one for the R side but if the problem is stricly wiring, wouldn't that trigger one of the other codes or all of them?
Interestingly it normally takes a few laps for the codes to return after being reset but the hub is obviously a lot hotter.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski