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  #1  
Old 12-11-2012, 04:37 PM
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P0320 Code

Vehicle: 2003 WJ; 4.0L engine w/ 125k miles;

Today at work I drove my Jeep to Subway and picked up a sandwich. When I got back to the Jeep, it would crank and crank, but not turn over and start. Luckily, I remembered the key dance trick and it pulled code P0320.

A quick search revealed no cranks sensor signal. So most likely, the CPS went bad. However, I went back 1.5 hours later when the engine was cold (it's 35 degrees outside) and the Jeep started right up no problem. I then drove it 35 minutes home without an issue. I thought it might be an issue with trying to start when it's warm, but it started again (after I turned it off) when I got home.

The only issue I noticed on the whole drive home was when I was going down the highway at 60 mph for a split second (talking 1/2 second to 1 second max), looked down at the gauges to see the tachometer drop to 0 and then immediately jump back up to normal. Then everything was normal the rest of the way home.

Does this sound like a CPS going bad? Or does someone thing my problem is rooted deeper in the system?

I'm replacing the CPS regardless because I already spent 2 hours getting the damn thing out (detailed "How To" with pictures will be posted later).
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  #2  
Old 12-11-2012, 05:50 PM
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Re: P0320 Code

My experience is that when the sensor gets bad, you will firstly discover this when its heat soaked, so after shutdown with hot engine and then starting again after 5-10 minutes. When you wait half an hour it normally starts without problems. So you will probably be fine after changing the sensor.
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Old 12-12-2012, 05:07 AM
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Re: P0320 Code

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Originally Posted by Frango100 View Post
My experience is that when the sensor gets bad, you will firstly discover this when its heat soaked, so after shutdown with hot engine and then starting again after 5-10 minutes. When you wait half an hour it normally starts without problems. So you will probably be fine after changing the sensor.
Thanks, that's what I'm hoping. This thing is a BITCH to change.
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Old 12-19-2012, 05:25 PM
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Re: P0320 Code

It's probably worth changing the cam pos sensor too.
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Old 12-19-2012, 09:47 PM
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Re: P0320 Code

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Originally Posted by CheapJeep82 View Post
It's probably worth changing the cam pos sensor too.
I don't think that's it because I replaced the crank position sensor and it has been working flawless since then. But after looking at the location and price of the crank position sensor, I'm going to replace it. It's pretty cheap and looks easy to replace.
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Old 11-06-2013, 06:19 PM
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Re: P0320 Code

Did you ever post the "How To" (with pictures) on replacing the Crankshaft Position Sensor? I am looking at having to replace the Camshaft and/or Crankshaft Position Sensor(s) on my 2002 Grand Cherokee. It has rpm drop-out or just won't start at times.
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Old 11-06-2013, 06:49 PM
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Re: P0320 Code

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Originally Posted by woodestock View Post
Did you ever post the "How To" (with pictures) on replacing the Crankshaft Position Sensor? I am looking at having to replace the Camshaft and/or Crankshaft Position Sensor(s) on my 2002 Grand Cherokee. It has rpm drop-out or just won't start at times.
Yes I did and here it is, enjoy. It's not a hard job to do, just aggravating.

How To: Replace Crankshaft Position Sensor
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Old 11-06-2013, 07:08 PM
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Re: P0320 Code

Okay, thanks for the link! I think this is what I've got to look forward to tomorrow. It looks like your instructions will be invaluable!
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Old 11-06-2013, 08:20 PM
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Re: P0320 Code

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Originally Posted by woodestock View Post
Okay, thanks for the link! I think this is what I've got to look forward to tomorrow. It looks like your instructions will be invaluable!
This weekend I've got to look forward to changing the rear main seal. Depending on how messy it is, I may make a "How To" on that.
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Old 11-18-2013, 05:29 PM
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Re: P0320 Code

Thanks again for the detailed instructions! Two weeks ago I replaced the crankshaft position sensor AND the camshaft position sensor and my 2002 GC 4.0L is running great. Before replacing these parts it would experience RPM dropout or complete stall after running 5-10 minutes. Total cost for parts from O'Reilly's was $110.
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