I had the p0008 on my 2010 CTS4.
I changed the sensor for bank 1 along with the solenoid actuator. The p0008 is gone, p0342 is now on the CEL. The car did not start until several long attempts. The sensor for the cam was bad and now has a full 12 volt load going to it and no more p0008. Ohms test shows the old sensor defective.

The solenoid actuator was not bad but replaced with a new AC Delco part. I show 9 volts input at key on.
And 2 volts when running. I also tried the old actuator with the same results. Both actuators show good with ohms result test.

The battery has a full charge, Alt putting 14 volts when running.

What would make the p0342 voltage drop? If i clear the code it reappears at the next start up. I'm stumped here, any help appreciated. The only odd issue was the long start up of several attempts before it ran. Any ideas?
Thanks.