Dodge ram won't start and ECM light and check

Bad starter if it won' even click the contacts

have battery tested if good fully charge,then check all relays and fuses.

First i would check the crank sensor by looking for rpm's on the tachometer or scan tool if you see any rpm's then crank sensor is good.Then check for leaking injectors and if they are not leaking then you will need to check the ECM it may have failed.

have alternator tested

If the truck runs, I would say its a bulb.
If the truck won't start, look at the fuse for the ECM.

if its a sensor the ecm will throw a trouble code which you can check by reading the obd2 with a scan tool

Hi

Thanks for using FixYa. The check engine light is on because ECM (Control Module) detected a fault with your car's system. ECM has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. You'll need to get the codes checked from a nearby dealer/mechanic. Please revert back for more help.

Rylee

It's referring to a slow response from O2 oxygen sensor #2. It could be a defective O2 sensor. This won't prevent your car from running, but your fuel economy/emissions could suffer. I would start with double checking the connector first if you can get to it.

If the check engine light is on, scan it for codes. Check for fuel pressure and spark at the spark plugs. Reply back on your findings & i will continue to help, based on what you find.
I hope this helps.

check all your vacuum lines. if there is a vacuum leak, the truck will crank, but not start. if you need a vacuum diagram, go to www.autozone.com create a profile it's free, add vehicle. put in the info of your dodge ram. then from the main screen, where it says select a category, select vehicle repair guide. on the next screen select emission controls. on the next screen where it says select a chapter, select vacuum diagrams. as you scroll down just click on the diagram for your engine. hope it helps. good luck.