Car will not start

P0430=Catalyst System Low Efficiency Bank 2
P0496=Evaporative Emission System Flow During Non-Purge.
U1016=Lost Communication with Engine/Powertrain Control Module
B0561=Not listed
The U1016 might be related to the no start, but from the rest of the description, I doubt it. More likely it's either a faulty battery, starter, or both. The interior lights dimming tells me the starter is drawing more current than the battery can supply. You need to get that fixed first.

Crankshaft position sensor would be highly doubtful. The same codes means I have the same diagnosis.

You should have a specific amount of pressure produced by the pump. You check it at the fuel rail.

By cranking do you mean the engine being turned when the key is turned to the start position, or do you mean the engine starting up and going 'vroom'?

If you mean the engine being turned when the key is turned, check the starter relay in the underhood relay box. I have included an image showing the location of the relay.

If it won't start with starting fluid, either you have a timing issue, low compression, or a weak spark. Recheck the spark. See if it is good hot blue snapping spark. If it is, check timing and compression. Here is a guide to help you get the job done.

https://www.2carpros.com/articles/how-to-test-engine-compression

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please let us know what happens.

Cheers

That is the problem. It should be around 50psi. If you give me the exact model and engine size, I can get that info for you.

This is a battery or connection problem. Load test the battery and check the voltage at the starter.

Yes, a bad crank sensor can cause this. Recheck the spark and make sure it is good. Here is a guide to help you see what you are in for when doing the job.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Here is the part on Amazon for $31.00 AC DELCO

https://www.amazon.com/gp/product/B000NW6XEM/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=2carprcom-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B000NW6XEM&linkId=3769e51bbb06a07f8347725afab2a356

Okay, recheck the spark and let me know what you find. Also, since this vehicle has coil over ignition packs, make sure all cylinders are getting spark and get back to us so we can keep helping you.

Cheers,

55 to 60 psi. That would blast out at you.

I need to know which 6-cylinder engine you have. 2.8 or 3.6