Question about 2001 Jeep Grand Cherokee
P0320 means "No Crank Reference Signal To PCM"
The Crank Position Sensor needs to be checked.
Posted on Dec 13, 2009
My advice, USE ONLY MOPAR OEM REPLACEMENTS
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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Posted on Jan 02, 2017
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