Mine does this too. Fortunately, I have P.A. Soft v1.36 to reset the error myself. Unfortunately, P.A. Soft v1.36 cannot recognize the error so I can't tell what's wrong. It's been three weeks since I did a reset and so far, the error hasn't returned. i have a 2005 4.8is. Funny thing is that my brother-in-law's 2001 4.4i with the 2-wheel (rear) SLS also get's this message once in a while but it also disappears by itself after a while. On my car, the first time it happened, I waited more than a month hoping it would go away but it never did. The error has appeared 4 times since I got my car in September.

__________________
Philip

2005 Le Mans Blue 4.8is
Go Blue '82