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Discussion Starter #1
Hi - My daughter's 2008 Cobalt LT (VIN: 1G1AL58FX87133264) is showing a continuous Service Traction in the DIC. Also shows a Traction Off once upon startup.

No check engine light present
No ABS message or ABS light present.

It has the following codes: C0050 (right rear wheel speed sensor circuit) and C0045 (left rear wheel speed sensor circuit).


Questions:

1) I am suspicious that both left and right speed sensor circuits have faults. Is it unusual for both rear speed sensors to go? or could the root cause be in the rear wiring harness which joins the connector and L/R sensors?

2) Is it possible to access the rear speed sensors connectors, to clean and coat with dielectric grease, without removing the wheel hub? Any tricks? (Drum brakes)

3) The rear common connector which the speed sensor wiring harness plugs into is an exposed connector (ie: no cover plate). Is this typical or missing cover?

4) How do I determine if this Cobalt has ABS? It has rear drum brakes and 5 lug nuts.

5) Is this issue typically a bad wheel hub/speed sensor? Just replace both sides...

Thanks.
Bob
 

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Sometimes a good puddle of water will disconnect that common connector from the force. Check and make sure all wires and connectors are intact. You have ABS brakes if you have and ECBM at bottom of rad support on driver's side.
 

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Coby7 could be right. I've had my entire rear ABS sensor harness come apart after I hit about 6 inches of water at 50 MPH. It worked fine for a while after I reconnected it. Then I was getting errors again and had to replace the entire harness. It's a fairly easy job and the errors haven't come back since.

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Discussion Starter #4
Thanks Coby7 and kcg795.

Is it possible to disconnect the common wire harness from the right and left rear wheel speed sensors without removing the wheel hubs? By looking through the rear spring, I can see where the wire harness connects but I don't have a good view of type of connection. Is the speed sensor integrated into the wheel hub or seperate? Do you know the part number of the common wire harness?

Thanks.
 

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Untill fotobucket changes their 3rd party hosting policy.
You may need to break the link and post the URL as plane text.
I could not open the image and only found the 07 silver Cobalt with license plate could not even find your user gallery
 

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Discussion Starter #7
I ohm'ed out the wheel speed sensor wiring harness and it's good. Reseated all the connectors and applied dielectric grease. I'm still getting the Service Traction and Traction Off messages. However, I did not clear the C0050 and C0045 codes. I just checked the DIC after reinstalling the harness and the messages are still being displayed. Let me know if I should clear codes and recheck DIC.

I'm planning to install new rear wheel hubs. Is this the correct part number? 22715555, 15889806.

Any recommendation on wheel hub mfgr?

2008 Cobalt LT
ABS (confirmed)
5 lugs

Thanks.
 

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If everything is good codes should clear after 3 restart and movement.
 
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