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Old 05-24-2013, 05:58 PM
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Crankshaft position sensor

I recently had my crankshaft position sensor changed after having issues.

It started almost a month or so before I actually had it replaced. Once in a while trying to accelerate from a stop light or stop sign, I would have hard revving and what seemed to me as a misfire. I though this was due to fluids being old and dirty, so I had those changed first. It went away for a couple of days and proceeded to occur. I had stalled out while idling in a parking lot but thought nothing of it because I couldn't remember if I had shut the car off or not. The final straw came while accelerating from a stoplight. I had horrible acceleration, super hard revs, and even hear a loud clunk. As soon as this noise was made, my engine light started going crazy. The ESP light even light even came on. I barely made the drive to campus which was about three miles away. I pulled the codes and received P0335 and P0339. These both had to do with the crankshaft. I tried getting home but had no luck. About a mile down the road, I stalled out and lost everything. It took a good five minutes of cranks to get it started again. It ran long enough for me to get it back into a parking lot.

It turns out, the sensor is below the oil pan and what happens is, oil sometimes drips onto the sensor and saturates it. This causes problems with sending electrical signals back to the computer causing the failure.

I would've done the replacement myself but having skid plates and not the proper tools, I had it towed to the mechanic. It was a simple fix and only ran about $150 total for parts and labor.

After the new sensor was installed, it ran like a whole new beast. Now I did have a tune and after install it seemed to rev a little high. After a good hundred miles or so, it was right back to the correct rev level.

I just figured I would post my experience so that others can prevent the problem before they end up with a dead car on the side of the road.

Hope it helps!!
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Old 05-24-2013, 09:43 PM
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Did your jeep idle real low when in park with ac off?
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Old 05-25-2013, 12:00 AM
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What's real low? Mine seems to idle low sometimes.
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Old 05-25-2013, 12:29 AM
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Re: Crankshaft position sensor

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Originally Posted by hemi_shox View Post
It was a simple fix and only ran about $150 total for parts and labor.
Looks like the mechanic stuck it to you pretty good, the part is about $15.00 and takes just a minute or two to change, maybe another 5 min. to remove the skid plate.
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Old 05-25-2013, 07:25 AM
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Mine will drop below 500 rpms when it's warm it than shakes
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Old 05-25-2013, 08:00 AM
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Originally Posted by hummer recovery team View Post
Mine will drop below 500 rpms when it's warm it than shakes
Mine doesn't drop below 5. 3.7l engine
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Old 05-25-2013, 08:28 AM
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Weird on mine it's intermittent
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Old 05-25-2013, 09:35 AM
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Re: Crankshaft position sensor

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Originally Posted by Milous View Post
Looks like the mechanic stuck it to you pretty good, the part is about $15.00 and takes just a minute or two to change, maybe another 5 min. to remove the skid plate.
There is diagnosis to be factored in aswell, just sayin.. Electrical checks, starscan, ect..
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Old 05-25-2013, 04:59 PM
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Re: Crankshaft position sensor

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Originally Posted by ALPINEST4RS View Post
There is diagnosis to be factored in aswell, just sayin.. Electrical checks, starscan, ect..
True, but the codes pulled pretty much point to the sensors as they are a common failure.

hemi_shox gives good advice in that it's great preventive maintenance - in fact I would replace both the Crankshaft position sensor and the Camshaft position sensor if you own a WK1.

Both parts list for only around $15-$17 each, and they can be challenging to find aftermarket as a often times cross-reference part numbers bring up wrong sensors.

The Camshaft sensor is extremely easy to replace as it's right by the thermostat housing.

Jeep sells about 75 Crank sensors a week, and almost twice that many Cam sensors. When these go bad/go out your chances of being stranded are very high!
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Old 05-25-2013, 05:09 PM
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Milous should I replace both mine I have 92,000 miles there original
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Old 05-25-2013, 05:14 PM
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Re: Crankshaft position sensor

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Milous should I replace both mine I have 92,000 miles there original
I would, only because it's so easy and cheap. The Crank sensor on my '08 failed at 36k miles. Fortunately I was just a mile from home, but I barely got the vehicle re-started. It was on a weekend and that's where I ran into the aftermarket replacement part not being the right one. Couldn't drive it for a few days, until I could order one from Jeep after the weekend.

With Jeep selling about 1000 of the crank/cam sensors a month it's bound to affect most owners at some point in time.
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Old 05-25-2013, 05:17 PM
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Thanks ill order them from jeep.
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