P0627 error code

Kenneth, Seized solenoid/starter, bad fuse /relay,theft deterent engaged,etc,etc.
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I saw car 100000km on it not much.They think maybe crankshaft sensor or camshaft sensor.Timing chain gone.How about the tune up.

Leaving it sit does nothing good. Are there any lights coming on in the dashboard?

P0627 is for problem in fuel pump relay and its circuit. Check for faulty fuel pump relay and loose connectors in the fuse box.

When it won't start will the engine spin or does it do nothing at all.

Hi Debbie , Do you know anything about automotive electrical systems an testing ? Viewing wiring diagrams to see what all is involved in the starting system on your vehicle would be the first step ,then testing the electrical circuits for the starter using a DVOM - digital volt ohm meter .
How to voltage drop test starter motor circuit
Starter Voltage Drop
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year ,make , model an engine . Under system click engine ,then under subsystem click on starting . Click the search button then the blue link. Looking at the diagram I see when the key is turned to start it send a crank signal to the PCM - engine computer , if the PCM gets a valid fuel enable & starter enable signal from the anti-theft system it will energize the crank relay sending B+ voltage to the S terminal on the starter solenoid . That is if the park neutral safety switch is OK . You mite try putting the vehicle in neutral to see if it starts then. These switch wear on the inside that could cause a no start problem . You can test from the crank relay ,watch this video VEHICLE RELAYS Operation Diagnosis In the video he uses a horn circuit , your crank relay works the same .

It sounds like you have an issue with your PassLock security system. I had the same with my 2002 Impala. Key turns OK, but won't start, won't crank. Wait 20-30 minutes, and car starts normally. There is usually a clue from the Battery and Security lights.
The problem starting to happen once a month, and eventually 1-2 times a week.
There are several write-ups on this problem for several GM cars for 2000-2006(?). Search this website, and search the web.
The official solution is to replace the ignition switch. The best solution is to bypass the Pass Lock system. I went ahead and did a full bypass, which involves cutting wires and adding resistors to the ignition circuit. I have not had a problem since.

O2 sensor won't cause a no spark no start condition but the crank sensor will. most time bad crank sensor will not set a code if engine doesn't start. usually set code on o drop while driving. I would check connection at sensor if good then replace sensor.

The security system does not disable the starter, it only disables fuel to the engine. In the fuse block under the hood, locate the STARTER relay. Place your hand on this relay and see if it clicks while someone else turns the key to start...if the relay is ok then the starter itself is faulty. Good luck, i hope this helps.