Hi, welcome to the site.

You should always disconnect the negative battery cable before disconnecting and reconnecting the PCM, otherwise damage to the PCM circuitry can result.

Try disconnecting both battery cables, touching them together and leaving them for about 10 minutes, then reconnect and hope that everything resets.

 

Thanks for the quick response, Sandstone. To clarify, are you suggesting touching the positive and negative battery cables together for 10 continuous minutes?

 

Yep, does a full discharge of any residual power stored in capacitors and resets the pcm and tipm. Some folks will use a zip tie to hold them together so they don't have to stand there and wait.

 

yeah and while youre at it clean those battery terminals with some baking soda and water mix. Lots of green crusties there. LOL. Get some of that red spray terminal protector too.. That might keep it from coming back for a while.

 

Thanks, Sandstone and Carbuff. I touched the positive and negative cables together for a little over 10 minute and cleaned up the battery terminals. Unfortunately, same result. Car just cranks and won't start. Any suggestions?

 

Check all the fuses, see if any are blown.

Sometimes the PCM connectors don't seat properly or a pin gets bent.
Disconnect the battery, as before touch the battery cables together to drain the system, and check to make sure.

What error codes are being thrown?

 

Check all the fuses, see if any are blown.

Sometimes the PCM connectors don't seat properly or a pin gets bent.
Disconnect the battery, as before touch the battery cables together to drain the system, and check to make sure.

What error codes are being thrown?

Well... Car fired up! Thanks, Sandstone! I disconnected the battery cables, disconnected the PCM connectors, checked that none of the pins were bent (none were), reconnected the PCM cables, touched the positive and negative cables together for about 10 minutes. It started right up!! Glad I found this forum. Hugely valuable. Thanks again.

- Anthony

 

Fuel, air and spark are your next tests. The easiest one being fuel, pull off the air cleaner hose and spray some starting, brake clean or carb cleaner fluid, or gas if you have some down it and see if it runs or sputters. Maybe the fuel pump fuse blew?

 

Ok so initially my 2016 jeep Patriot sport 2.4 L was over heating and went in limp mode ....since then I replaced the thermostat housing, the water pump, the engine oil temperature sensor, the upper radiator hose and the air temperature sensor. Currently will turn over but not start also no codes are being thrown. What could it be? A relay fuse??! Please help lol

 

Check the relay box for corrosion on the wiring and relay pins, and also check fuses 33,18,23,26, and 32.

 

Okay will do. Thank so much I'll get back to you