P0320 code on 4.0 2001 grand cherokee laredo - JeepForum.com
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post #1 of 7 Old 07-03-2011, 07:43 AM Thread Starter
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Wj P0320 code on 4.0 2001 grand cherokee laredo

My 2001 wj 4.0 engine ran fine yesterday. This morning I went to start it & it cranks, but will not start. I can hear the fuel pump engaging, so i do not think that is the problem. It is showing a p0320 code, which i have read is a bad crank position sensor (cps). I have had 4 back surguries & i cannot get under the jeep to fix this, but i have also read that i should be able to see the cps from under the hood. Can anyone tell me where the cps is located on a 4.0 if looking from the front into the engine compartment? Also, what does it look like? I would like to try to fix this without getting under the jeep. Can anyone help me? Thanks in advance!

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post #2 of 7 Old 07-03-2011, 10:35 AM
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It's near the top of the transmission housing where it bolts to the engine. I've never heard of anyone being able to change it without getting under.
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post #3 of 7 Old 07-03-2011, 11:25 AM Thread Starter
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Thank you for your help rm2001wj!

I am trying to get a look at it, but everything is very tight & close to the firewall in that area. I will keep looking & I will try to feel for it to get an idea of what needs to be done. I have a great mechanic that will come to my house if needed to work on it, if I ask him, however it is a holiday weekend, so he is out of town.

If there is anyone that lives near Lancaster, PA that is reading this that can remove & replace my crank position sensor today, or tomorrow 7/4/11 in my garage, I would be greatful & I will pay you, because I cannot do it my self due to my back injury

Otherwise, if anyone has any other input on this matter, please reply.

Thanks in advance for the help!
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post #4 of 7 Old 07-03-2011, 12:54 PM
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I just went through this a week or so ago, and IMO it's not worth changing even if you could, it's PITA and a good machanic will do it in an hour he even had to remove the trans crossmember.
It cost me 40 bucks in labor.

QUOTE=billzcat1;wsar10 is right on point on this oil thread - as usual. Anyone reading this would be well-served taking his advice.

-03 WJ laredo 4.0 120k a few minor mods
-93 XJ 5spd, 3" zone lift
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post #5 of 7 Old 07-03-2011, 11:18 PM Thread Starter
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Thank you for your input "wsar10"!! You are right, I will leave this repair to someone that has done this task before & I know that my mechanic good, fair & honest.

Thank you again for taking the time to reply to my posting.
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post #6 of 7 Old 07-05-2011, 09:47 PM Thread Starter
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Wj Thanks to all that helped

My mechanic replaced the crank position sensor today in less than 45 minutes & my jeep g c started right up. It took longer for aaa to tow it to my mechanic's garage than it took to repair the problem.

I just wanted to say "thank you" to all that helped me with this problem & i hope that i can help some one in the future in this same way. Jeep people are the best!
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post #7 of 7 Old 10-05-2014, 09:46 PM
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I wanted to share my experience the last couple weeks with this issue. I have 2001 Jeep Grand Cherokee 4.7L. 134,000 miles.

Jeep was running fine until 2 weeks ago I accelerated from a stop and there was a slight "jump" in my jeep. The check engine light came on. After surfing this forum I discovered how to pull the error codes (turn key on/off 3 times). I pulled a p0320 & p0700.

I drove for about 3-4 days and experienced an almost stall once and a while and the truck would "buck" a couple times. So, I followed up with the dealer to run a diagnostic. He clarified it was p0320 & p0720.

He diagnosed it as a pretty common problem with Jeeps and suggested a change of the Camshaft Position Sensor and the Crankshaft Position Sensor. After scanning this forum and countless others this seems to be the issue with most people that have similar problems. So I made an appointment for the following week to drop it off. The dealer said as long as the check engine was solid and not blinking it would be safe to drive until then.

Drove for the week. No issues. The check engine light actually went off for 3 days before reappearing the day before the appointment. The morning I was to take it in to the dealer the Jeep wouldn't start. This never had happened....it would try to start but just couldn't turn over. Towing to get it fixed was $200. Plus the dealer cost to replace the 2 sensors would be another $260.

I called a friend who knows his way around cars. He tries to save me a few bucks and swings by Carquest. He picked up the 2 sensors from Carquest (non OEM). 2 hours later he had the new ones in. We go to start it the Jeep starts (pretty roughly), the RPM's start jacking up and down for like 5 seconds and then the car stalled out. We tried again to start it and nothing. Again it tries to start but it just won't turn over. But the check engine light is off and the error codes read "done".

Frustrated I let it sit overnight. Next day I try and restart. It starts, I take it through the neighbor, it wanted to stall several times but I applied gas each to prevent it from doing so. I get back and turn it off and try to restart and again it just won't turn over. I Re-read through this forum and others. I see one common theme from some others that have similar issues. I used non-OEM parts from Carquest.

I phone my buddy again. We go to the Jeep dealer. Pick up the OEM versions Mopar part #56041584AF (CAM sensor) $39.45 and Mopar part #56028666AB (CRA sensor) $64.85. Swap out the Carquest ones. Install the Mopar ones. Truck starts up first try, no issues at all!!! All the error codes are cleared. No check engine light. That was 3 days ago!!! Been running perfect since then. Spend a little more and use the Mopar OEM parts and you wont be checking a dozen different things. Good luck.
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