Hi,

I recently got a 2000 C5 Vette A4 with 25,000 miles. On my way to work yesterday I was gently slowing up to a car in front of me making a left turn when I felt the ABS come on. Then the DIC said ABS and Active handling needs service. Both idiot lights came on. When I shut the car off and restarted all went away. On my way home the same thing happened again but I was not braking at the time. Restarted and all errors went off. Error code is C1226 - Right Front Excessive Wheel Speed Variation. Anyone out there have any suggestions before I take it in for a look. Thanks in advance

 

Pavesi

Many dealers have a tendency to want to replace the ABS EBTCM which is very expensive.
There have been quite a few forum members who have had this same issue and have found out that cleaning the chassis grounds have helped solve this issue. The chassis grounds are reliative easy to clean and if you do it your self, it is FREE! As the years roll over and the miles add up on our C5's, ground problems will become more amd more prevelent!

Checking and cleaning chassis grounds and checking the battaey terminals are always a good place to start when troubleshooting any electrical issue.

I had SIGNIFICANT electrical problems with my 98 MN6 Coupe. For months, I would randomly get stranded on the side of the road if i decided to drive it any where. I was ready to burm the car!!!

Just about all of the problems were being caused by corroded chassis grounds. After I cleaned the grounds, ALL IS WELL!!!!

Here is a link to the post that I wrote to document the issue and how to clean the grounds:
http://forums.corvetteforum.com/show...al+information

You should examine the wheel speed sensors and the connections at each wheel. The connectors could be dirty or damaged.

Please review the post and give the chassis grounds a once over. It explains a lot about the grounds and shows you where they are located.

if you have any questions, please let me know.

Bill Curlee

 

I was told a bad wheel bearing could also cause it.

 

Yes it could and that is easy enough to check! Raise the wheel off the ground and shake the tire inward and outward at the 12 o'clock/6 o'clock & 9 o'clock/3 o'clock position. Look for excessive motion of the wheel. You should really see very little movement.

If you see movement, you could remove the tire and check the hub with a dial indicator.

BC

 

It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.

Using a DVOM check the resistance of the WSS between terminal A and B of the sensor connector: 850-1350 ohms. (If not, sensor is no good.)
With the DVOM still connected, select millivolt AC scale, spin the wheel as fast as you can by hand. Check the AC voltage reading on the DVOM while spinning the tire. If reading is above 100 mV, sensor is ok.
Just a few easy checks.

 

After reading the link that Bill Curlee providied I decided to give it an inspection and found the left front chassis ground connector to be not fully inserted. I pushed it in fully and the problem has not returned in two days of driving. I am having the oil changed next week and while I'm there my Vette guy will check the front sensor using the technique WhiteC5Vette explained. I think you guys have saved me some cash and a lot of headaches. Thanks to you and all the rest in this forum.
Ron