WK 5.7 Hemi Crank position Sensor Failure - JeepForum.com
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Unread 07-28-2009, 06:34 PM   #1
bmill
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1998 ZJ 
 
Join Date: Jul 2008
Location: Indianapolis, IN
Posts: 20
WK 5.7 Hemi Crank position Sensor Failure

I just thought I would share my experience for others to learn from.

Yesterday, I drove the jeep 35mins home from work. Then 30 mins later, I jumped back in for a couple of errands and that's when trouble started. The jeep under throttle was bucking heavily and stalling out after ~3 seconds of bucking and then threw a CEL. I decided to park it and grab some tools and an OBDII scanner. Tried turning it off and back on a few times with no change. Pulled a P0330 Random cylinder misfire code from the computer. Decided to unplug the battery and reset everything and try again...After 15 mins, hooked everything back up and went to fire the beast up....nothing but cranking for 15 seconds. The jeep then threw another code and went into limp mode...Next try the jeep fired up. The new code was a P0335 Crank Position Sensor Circuit malfunction code. The jeep ran smooth just didn't have any power so I ended up limping it back to a dealer here in Indy.

The dealer then confirmed both codes stored in memory and recommended changing the cam sensor along with the crank position sensor "because they share the same reference signal". I ended up just having the crank position sensor replaced and every seems to be running fine. I'll report back in a week or so to see if it's still gone. Total cost from the dealer was $205. Would have done it myself, but I'm just too busy lately and need my Jeep working.

I have had some random long cranking starts but besides that have had no problems. Yet to see if the two were related.

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Unread 09-16-2009, 05:57 PM   #2
icecreamman
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2005 WK 
 
Join Date: Jan 2009
Location: Chicago
Posts: 25
Does anybody know where is the sensor located? I can't find any diagrams or references to its loacation in the factory service manual. I'm having the exact same problem and bought the sensor.

If you can explain the easiest method to change on a QDII HEMI that would be even more helpful.

Thanks in advance
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Unread 09-07-2011, 08:04 PM   #3
fajita123
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2005 WK 
 
Join Date: Aug 2011
Location: Calgary, AB
Posts: 13
Sorry to bring this back from the dead, but I'm having the same issue. Can anyone provide some guidance on both the crank and camshaft sensor locations? How difficult would they be to replace at home?

Thanks!
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Unread 09-07-2011, 08:08 PM   #4
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,178
Quote:
Originally Posted by fajita123 View Post
Sorry to bring this back from the dead, but I'm having the same issue. Can anyone provide some guidance on both the crank and camshaft sensor locations? How difficult would they be to replace at home?

Thanks!
Crank sensor is located on the passenger side of the block towards the back of the engine.The cam sensor is located underneath the AC compressor,just right of the EGR valve(as your looking at the front of the engine).Just a hint,you want a totally cold engine for changing the cam sensor as the back of your hand tends to rest on the EGR valve when changing it out.
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Unread 09-07-2011, 08:09 PM   #5
I8AHUMR
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1993 YJ Wrangler 
 
Join Date: Apr 2009
Location: Dayton, OH
Posts: 528
The crankshaft position sensor is on the passenger side underneath. Near the mid to rear on the bottom of the motor.
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Unread 09-07-2011, 08:40 PM   #6
fajita123
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2005 WK 
 
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Location: Calgary, AB
Posts: 13
Thanks so much guys!
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Unread 09-07-2011, 08:51 PM   #7
thisisrediculus
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2005 WK 
 
Join Date: Mar 2009
Location: st louis, missouri
Posts: 9
i changed the crankshaft sensor myself and its fairly easy. i removed the engine skid plate for easy access, unplug it, and theres only one bolt holdin it in. i picked the sensor up at the dealer for like 45 bucks. i think i got robbed cause ive heard of someone gettin it for like 20 bucks but i saved by changin it myself so no big deal.... theres another sensor a little higher and closer to the center of the block i was thinkin that was the camshaft sensor but maybe im wrong
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Unread 09-07-2011, 09:15 PM   #8
tjkj2002
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Quote:
Originally Posted by thisisrediculus View Post
i changed the crankshaft sensor myself and its fairly easy. i removed the engine skid plate for easy access, unplug it, and theres only one bolt holdin it in. i picked the sensor up at the dealer for like 45 bucks. i think i got robbed cause ive heard of someone gettin it for like 20 bucks but i saved by changin it myself so no big deal.... theres another sensor a little higher and closer to the center of the block i was thinkin that was the camshaft sensor but maybe im wrong
That other sensor was the knock sensor.From 15 years worth of experiance Chryslers only really like OEM sensors,yeah they cost a little more but it's worth it in the long run.
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Unread 09-12-2011, 07:33 PM   #9
fajita123
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2005 WK 
 
Join Date: Aug 2011
Location: Calgary, AB
Posts: 13
Just thought I'd share - for me it turned out the PCM needed to be flashed with a cam-related TSB. Stealership took care of this (for a fee) and all good now.
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Unread 10-12-2011, 10:25 PM   #10
ddk1
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2005 WK 
 
Join Date: May 2010
Location: Rancho Cucamonga
Posts: 14
Hi all,

I just had this happen to me tonight. On the way home from dinner, the jeep started to buck, and the check engine light began to flash. So I pulled over and plugged in my superchips and sure enough, crank shaft position sensor threw a code, causing cylinder misfires.

The jeep had been programmed with the economy 87 tune, so I re-flashed it to stock tune and cleared the DTC's. Sure enough, she fired right up and I drove the rest of the way home with no issue, no bucking, etc.

Am I out of the clear? Should I change the sensor anyways? The Jeep has 72,XXX miles on it, is it about the time this sensor typically fails?
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Unread 10-13-2011, 11:37 AM   #11
fajita123
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2005 WK 
 
Join Date: Aug 2011
Location: Calgary, AB
Posts: 13
I was able to clear mine as well. After clearing the code, most times it would drive fine but the odd trip it would "buck" or "surge" (almost felt like it was missing for a second) at random times. I changed out the part ($45 at the dealership) and it hasn't happened since. It probably wouldn't hurt for you to wait and see what happens, but it's an easy fix if the problem persists.
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Unread 10-13-2011, 07:51 PM   #12
SampsonSimpson
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2006 WK 
 
Join Date: Oct 2011
Location: Great Mills, MD
Posts: 48
I had this same problem about 3 weeks ago. I had 2 codes that pointed to the crankshaft sensor. I just bought one from Autozone for like 16 bucks. And its really easy to change, one bolt and one plug, it is in kind of crappy spot. Underneath the passenger side, and it is possible to change with the skid plate on.
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Unread 10-13-2011, 11:34 PM   #13
90grandoneer
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2006 WK 
 
Join Date: Apr 2008
Location: City of Trees
Posts: 1,872
I bought both (cam and crank) sensors for my Hemi when I changed the cam. In the end I decided not to change them though, since they're relatively easy to change. I will carry them in my vehicle "emergency kit" though, in case I have a problem on the road. Cheap insurance, both for ~$65 from the stealer. My DashHawk has a built in code reader, as does either the DS or SC tuner, so it would be easy to diagnose. I also carry a listing of all the Diagnostic Trouble Codes and what they mean.
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