Jeep Patriot Forums banner
21K views 16 replies 9 participants last post by  jaison  
#1 · (Edited)
Does anyone have any clues/ideas what may cause this crank / no start issue. Vehicle is NOT throwing any OBD2 codes

Model: Jeep Patriot 2014 Sport 4x4
91000 miles


Vehicle has gas
Vehicle has recent oil change
Battery is fully charged
All relays and fuses have been tested
Jeep was straight piped about a year ago
No problems till today.


….I’m lost…
 
#8 ·
If you think it's the fuel pump, try leaving the ignition on and thumping the bottom of the fuel tank with your hand or a rubber mallet, maybe that will get it going.

Other than that, you could try resetting the system by disconnecting the battery cables, touching them together and leaving them for 10 mins or so then reconnect and try.
 
#13 ·
Here's another vote for crankshaft position sensor failure with no codes:
 
#15 · (Edited)
One mechanic in the Google searches stated his battery had an internal short/bad cell, allowing the engine to crank, but not enough to start the engine. Diagnostics is difficult (for me) to not to put on blinders and I end up neglecting some possibilities because I set my mind on preconceived symptoms/solutions.

Sometimes a scanner with live data will help diagnose no CEL issues. EDIT: Even sub- $100 scanners (non bi-directional) can provide live data. I'm not sure at what point one needs a scanner that collects mfg. specific codes (Tranny, engine, ABS, SRS, etc.) - still available sub $100.