05 CTS-V. Cam pos. sensor codes p0342 and p0343 for high and low circuit. They both come back even with the sensor unplugged. Testing the connector on the car that goes to the sensor its 10.9v between power and ground. My battery is at 11.6 so I think it should be at least very close to that. The 3rd wire is a 5v signal coming as an output from the sensor. When I tested between the power and the 5v signal wire on the car side I got 10.9 again. I pulled the PCM and tested continuity between both ends of the harness, and it checked out. Also didn't get any continuity between the ground and the 5v, so if there's a short I'm thinking it has to be in the PCM. I don't have another LS car to test the harness on, but I'm pretty sure a 5v reference is not supposed to have a 12v (10.9) ground. The car was tuned with HP roughly 6 months ago if that makes a difference.

 

Your battery is low enough to be considered dead for automotive purposes. That has to be taken care of before you try anything else.

 

I did try a brand new battery and problems persisted. Also, the systems on these cars are designed to be able to function between 9 and 17 vdc. I understand 11.6 is low, but that's not my problem and it shouldn't be dropping 0.7 and 0.8v between the battery and the connector.

 

Does the car crank with a good battery? A cam code will not keep one from starting, it will just need to crank over longer for the pcm to determine which rotation the crankshaft is on.

 

new battery did not make a difference other than maybe cranking a little faster because it's a new battery.

 

You are supposed to see 12V on both cam/crank with your car. Only the newer Gen4+ vehicles/ECMs with the 58x/4x crank/cam use 5V reference. Easy to change the cam position sensor first, if that doesn't fix it you either have a wiring problem or a PCM problem. I've never seen one throw both of those codes at the same time.

 

I saw a YouTube video on it on an LS2. I guess I figured it'd be the same since the sensor was still in the valley and the LS2 is like a Gen 3.5 in a way. Good to know I am supposed to have 12v there. But the ecm seems to be eating about .7-.8 volts between the battery and that sensor. I have an ecm on the way. From what I've seen on the forums, most people with both codes have the cam bolts problem. I'm trying to exhaust every possibility before diving into that.