SOURCE: what is gm code CO455
On Gm web site, I found service document for a DTC C0455 and/or
C0710 set. This condition may be caused by an increase in resistance in the circuits connecting the steering position sensor and the EBCM(electronic brake control module) due to fretting corrosion on the connector terminals.
Also, the male to female plastic connector may have excessive clearance that can cause the connector to move up and down.
Note: Fretting corrosion looks like little dark smudges on the electrical terminals and appear where the actual electrical contact is being made. In less severe cases it may be unable to be seen or identified without the use of a magnifing glass.
Recommended by GM, Do not replace the steering position sensor for this condition. The terminal pins on the sensor do not have the same concentration of deposits.
1. Disconnect the steering Wheel position sensor connector.
2. Add a piece of adhesive back shim stock the width of the connector to the flat surface on the male connector. This provides support to the connector to keep it from moving up and down.
important: do not apply an excessive amount of dielectric lubricant to the connector as hydrolock may result when attempting to mate the connector, use only a clean nylon brush that is dedicated to the repair of this specific condition.
3. With a nylon bristle brush, apply dielectric lubricant to both the sensor side and the harness side of the affected connector.
4. Reconnect the steering Wheel position sensor connector and wipe away any excess lubricant that may be present.
5. Attempt to duplicate the condition. If the condition cannot be duplicated, the repair is complete. If the DTC resets, replace the steering angle sensor harness side connector with the service pigtail.
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