Error code Po496 cadillac CTS

SOURCE: CD Mechanical Error on 2003 Cadillac CTS

take the radio apart and take them out one by one, i just fixed my yesterday

SOURCE: I have a 2005 cadillac cts with 90,000 miles and

I've been having hesitation with shifting for the past 3 years. been in the shop 6 times (its a 2006 CTS with 78,000kms on it).
First they replaced the torque converter. That fixed the symptoms for 6 month. then they replaced the ****** under warranty. next time it was software. next time I'm not sure what they did to fix it. This time they blamed it on timing chains. After being in the shop for 8 weeks, I picked it up today and it worked great, except the check engine light came on, drove it straight back to the dealer. they took it for a test drive and it broke down on the highway. had to be towed back in.

My guess is you have the "stretched" timing chain issue that can occur on the Cadillacs. It might be covered by warranty, or if your SOL like me... not covered under warranty. Right now I'm fighting with GM Canada and the local GM dealer to fix this under warranty since it started under warranty to begin this.

SOURCE: what does code po496 mean on my cadillac sts 3.6l

your evaporative emission canistor solenoid purge valve is either stuck open or shut and needs to be replaced-auto zone pep boys or advanced auto can hook up diagnostic and confirm for free-cheers Denny