No start condition with a P1391 code

[Ruger]

I have a 2004 Jeep Wrangler Sport RHD mail jeep that is in a no start condition (suddenly cut off) and has a trouble code of P1391. Anyone have suggestions to fix?

 

[KingCarGuyZ]

https://wranglertjforum.com/threads/p1391-error-code.6894/Looks like a crank or camshaft code, makes since that the Jeep wouldn’t start with that. I’d say replace the crankshaft sensor. Be sure to get MOPAR in these sensors, TJ’s are notoriously finikey about them, and there is tons of story’s of the auto parts special not working.

 

[Chris]

In many cases, error code P1391 happens when the timing chain has jumped due to a recent change of the sensors. Other possible causes include:

• Faulty crankshaft position sensor
• Open or shorted crankshaft position sensor sensor harness
• Poor electrical connection in the crankshaft position sensor sensor
• Stretched or jumped timing belt or chain
• Faulty camshaft position sensor
• Open or shorted camshaft position sensor harness
• Poor electrical connection in the camshaft position sensor

This could also happen if the coils and injectors are getting fired intermittently. Something you would expect if the PCM is getting a weak signal.