1999 Chevrolet Express 2500 Q&A

1999 Chevrolet Express 2500 Question: My van will not crank when I turn the ignition key.The engine will not turn over

If I jump the starter solenoid with the ignition key in the on position it start up. After itnruns for a while it will crank with the ignition key, but if I let it set for a while I have to jump the starter solenoid again -
Answer 1
have anti theft codes scanned to see if you have any faults with alarm to start with. you may have a key and or skim issue if this van have that system -
Answer 2
possible ignition switch -