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Here is the explanation from Talon90 on another site on 2-9-09:
The 2005 C6 manual is the only year C6 that actually still has a column lock. The column lock is a solenoid and pin arrangement that when you shut the car down the solenoid releases the pin (electro-magnet) so that the pin can engage a hole on the steering column and lock the steering wheel as an added theft deterrent. If the steering wheel is turned and trying to turn back the other way (hard to describe) when the pin engages it can bind the solenoid which will prevent the pin from disengaging the steering column. If this happens and it does not return in the appropriate amount of time that the sensor is looking for, it will return an error message. If the battery is low it can also return this error message as the solenoid doesn't energize enough to actually disengage the pin.
This system is a carryover from the C5 (5th Generation Corvette from 1997-2004) and unfortunately it was riddled with problems. So much so that it was finally dropped for the 2006 C and later cars. Often just turning the wheel back the other direction when trying to start the car can free the pin and solenoid. My best advice to your friend is to not let the wheel lock. You can do this by not moving the wheel once you shut the car off. There are several slots around the lower diameter of the steering column. If the pin attempts to engage where there is no slot it will simply press against the collar and won't engage. If it doesn't engage, it can't bind.
Here is the link to the site so you can read more:
Service steering column lock usually displays when the battery is low. Replace the battery or charge it if it is still good and the message will go away. The 05 is the only year with the lock.
yeah, if the battery goes low, the computers in the car start going nuts. When my original delco went out, I got the column lock message, a service abs message, and a service active handling message. As soon as the battery was replaced, it all went away. These cars are heavily dependent on battery voltage to function properly.
ok I posted on another thread, battery was replaced two weeks ago with minimal driving until I drove 65 miles to work on Monday and tonight after returning to Vegas the car would not start with the SCL error, DIC voltage read 13.8 initially after the jump and 14.4 after reaching home. Any ideas? Is the DIC voltage reading what the alternator is putting to the battery or what the battery is charged to?