I have a 2000 Monte Carlo SS with 54,000 miles that is currently at the
dealer with similar problems. They have had it for a total of 7 days over
the last 2 months. It started with 3 warning lights coming on at different
times, but progressively got to the point last week where 5 warning lights
would come on for 5 seconds whenever the turn signal was used. Also, it
started having unpredictable starting problems. Previously, the diagnostic
test couldn't find a problem and the dealer said they couldn't do anything.
This time the diagnostics showed over 20 error messages. The dealer says
that their GM database says that replacing the ignition switch has solved
the problem on some occasions. I hope so since I just authorized the
repairs and am fed up with the problem and GM's crappy service and attitude.