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Looking to buy 2005 cts 2.8, have a few questions

784 views 1 reply 2 participants last post by  Bluehaze07 
#1 ·
I would like to buy my wife a 2005 cts with a 2.8. Took the car for a test drive, the car has a slight rmp fluctuation at idle. While driving, I believe under the passenger seat, closer to the middle of the car, under console, is a rattling noise. Has anyone ever had rattling from that spot? Any ideas?

Car also had 2 dtc codes:
P0420-Catalyst System Efficiency Below Threshold (Bank 1)
U1016-Loss of Class 2 Communication with VCM- what does that mean?

Any help would be greatly appreciated.
 
#2 ·
You probably have a cat that has a hole in it. IMO That is most likely the cause of the rattle and code P0420. Take a look under the car and check the passenger side cat and heat shield or have a exhaust shop look at the car.

Hopefully someone else can help with the other code.
 
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