I have a code po315 on my dodge caliber what does it mean?

Where did you get coide? whover ran it should have told you. All codes are available in internet
P0455 Dodge EVAP System Large Leak

P2173 DODGE - High Air Flow - Vacuum Leak Detected - Slow Accumulation
https://www.autocodes.com/p2173_dodge.html

P0507 - Idle Control System RPM Higher Than Expected
https://www.autocodes.com/p0507.html

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you can read through the suggested answers and you can read through this discussion to get insight into the problem. Dodge Codes P0315 and P0339

low coolant

p2017 is a intake manifold runner position switch or sensor high bank 1.

It actually reads (GAS CAP) it has detected that you left the gas cap off or is loose.tighten down and it will be ok

p0128 is coolant temperature sensor below range, change sensor. p0604 is pcm random access mem ( ram error. it may mean the pcm has failed, have it checked out..

CODE PO335 CRANKSHAFT POSITION SENSOR CIRCUIT. CODE PO315 - NO CRANKSHAFT POSITION SENSOR LEARNED. POSSIBLE CAUSES, CRANKSHAFT TONE WHEEL FLEX PLATE IS DAMAGED, TONE WHEEL PULSE RING MAY BE DAMAGED, ERRATIC CKP SENSOR SIGNALS WIRING CONNECTOR PROBLEM, CKP SENSOR HAS FAILED, PCM HAS FAILED.

You are missing some numbers.