Service abs light on after pothole
Thread Starter
Racer
Joined: Feb 2008
Posts: 343
Likes: 1
Service abs light on after pothole
Hey, I made a previous thread before and thought I found the problem, but not completely sure. Today was driving home and hit a large pothole with my front passenger side tire. Just replaced the fronts last week and now I have a bubble on the brand new tire 
Now my service abs light is on and the red brake light is on and won't go off when the E-brake is fully down. Anyone else have this happen? I'm going to bring the car to a friend to check the code and hopefully can get the new tire fixed under warranty as it has been way less than 30 days since I purchased them. The steering wheel is VERY tight now so obviously something isn't right. Hopefully it's just a sensor and the wheel isn't bent but again does anyone have any info on what may be wrong? Sorry for the double post, I just noticed the bubble on the tire not too long ago and used the search button but most of the info has come up on c5's and I can't pull any codes on the c6 without a reader...
Greg
Now my service abs light is on and the red brake light is on and won't go off when the E-brake is fully down. Anyone else have this happen? I'm going to bring the car to a friend to check the code and hopefully can get the new tire fixed under warranty as it has been way less than 30 days since I purchased them. The steering wheel is VERY tight now so obviously something isn't right. Hopefully it's just a sensor and the wheel isn't bent but again does anyone have any info on what may be wrong? Sorry for the double post, I just noticed the bubble on the tire not too long ago and used the search button but most of the info has come up on c5's and I can't pull any codes on the c6 without a reader...
Greg
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Hey, I made a previous thread before and thought I found the problem, but not completely sure. Today was driving home and hit a large pothole with my front passenger side tire. Just replaced the fronts last week and now I have a bubble on the brand new tire
Now my service abs light is on and the red brake light is on and won't go off when the E-brake is fully down. Anyone else have this happen? I'm going to bring the car to a friend to check the code and hopefully can get the new tire fixed under warranty as it has been way less than 30 days since I purchased them. The steering wheel is VERY tight now so obviously something isn't right. Hopefully it's just a sensor and the wheel isn't bent but again does anyone have any info on what may be wrong? Sorry for the double post, I just noticed the bubble on the tire not too long ago and used the search button but most of the info has come up on c5's and I can't pull any codes on the c6 without a reader...
Greg
Now my service abs light is on and the red brake light is on and won't go off when the E-brake is fully down. Anyone else have this happen? I'm going to bring the car to a friend to check the code and hopefully can get the new tire fixed under warranty as it has been way less than 30 days since I purchased them. The steering wheel is VERY tight now so obviously something isn't right. Hopefully it's just a sensor and the wheel isn't bent but again does anyone have any info on what may be wrong? Sorry for the double post, I just noticed the bubble on the tire not too long ago and used the search button but most of the info has come up on c5's and I can't pull any codes on the c6 without a reader...
Greg
There may be something you can do in the meantime though. On each wheel hub assembly is a connector for a vehicle speed sensor. I would suggest removing each wheel to make sure they're all still clipped on properly and to also disconnect and reconnect each one to reseat the electrical connection.
Instructor
Joined: Mar 2011
Posts: 117
Likes: 0
From: LaPorte Indiana
The sensors are part of the wheel bearing/hub assy's and are not replaceable as an individual part. You have to replace the whole bearing hub assy, which is actually pretty easy. The wires coming off the Wheel Speed Sensors are only about 6 inches long. On the front wheels they go to a connector right behind the spindle, then to an intermediate cable that is probably 2 foot long. So be sure and check both connectors on each side of the front.
Not real good, but this is the only picture I could find.
1, 2, 3 and 4 actually point to the sensor assy's. The red arrows I added are the front connectors.
Not real good, but this is the only picture I could find.
1, 2, 3 and 4 actually point to the sensor assy's. The red arrows I added are the front connectors.
Last edited by Pauls72; Mar 18, 2011 at 01:12 AM.
Thread Starter
Racer
Joined: Feb 2008
Posts: 343
Likes: 1
VERY long morning. Thanks again for everyone's help, I brought the car in and the snap on scanner should a code of U0121. We cleared it, but it came back right after. Discouraged I called up Chevy and made an appointment for tuesday morning to get the car checked but on my way home the code went away... and now it drives perfect again. I made sure all the connections were tight like recommended in the thread and all is well now. Will pop back on if it comes back, but hope everything stays fixed.
Greg
Greg
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
U0100 - U0299
Lost Communications with XXX Control Module
IF,,,, the EBTCM lost comms with the BCM (for what ever reason) you would feel a tighter steering because of the MAGNASTEER in the steering box does not work without the EBTCM being fully operational. Completely normal!
I have not taken a C6 wheel speed sensor connector apart "YET" but, if there anything like the C5 connector, the female pins are often suspect.
The female pins can spread and deform under vibration / shock and will loose contact causing a loss of wheel speed sensor signal.
Here is an example of what a new and old (bad) wheel speed sensor femal connector looks like on a C5. The OLD one has deformed pins:
My guess is that you did have a wheel speed sensor issue and now the connection is good again. When you cycle the ignition, the EBTCM clears the DTCs and goes into a self test. If theres anything wrong during that ignition cycle, you will see messages. Read the DTCs prior to turning OFF the ignition to see what codes/DTCs caused the messages.
Bill
Lost Communications with XXX Control Module
IF,,,, the EBTCM lost comms with the BCM (for what ever reason) you would feel a tighter steering because of the MAGNASTEER in the steering box does not work without the EBTCM being fully operational. Completely normal!
I have not taken a C6 wheel speed sensor connector apart "YET" but, if there anything like the C5 connector, the female pins are often suspect.
The female pins can spread and deform under vibration / shock and will loose contact causing a loss of wheel speed sensor signal.
Here is an example of what a new and old (bad) wheel speed sensor femal connector looks like on a C5. The OLD one has deformed pins:
My guess is that you did have a wheel speed sensor issue and now the connection is good again. When you cycle the ignition, the EBTCM clears the DTCs and goes into a self test. If theres anything wrong during that ignition cycle, you will see messages. Read the DTCs prior to turning OFF the ignition to see what codes/DTCs caused the messages.
Bill
