Hey everyone!

I just bought my first Cherokee and had the CEL come on 5 days after buying it. The error code is p1391 intermittent CMP/CKP signal. I already replaced the CMP and the error is still hanging around so I assume its the crankshaft. I ordered a mopar one today but it won't get here until next Tuesday. I was just wondering if this is a safe error code to drive on?

Thanks!

 

What year is it and is it an XJ?

 

Its a 2000 XJ

 

What determines whether any vehicle is alright to drive is whether it starts, runs & drives OK, any gauges read normal &/or no important (high temp, low oil pressure) warning lights are on. Absent any symptoms any diagnostic aids can be ignored.

 

Drives completely fine. I don't notice any difference after replacing the CMP sensor but it starts every time, no misfires, or stutters or anything. I'm only going to be driving it around town until the crankshaft I ordered comes in.

 

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Old 03-02-2023, 05:40 AM
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roninofako
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Join Date: Feb 2011
Location: Blunt, South Dakota
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Year: 97
Model: Cherokee (XJ)
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Default ATTENTION ALL USER: Please read before posting!!!To all users of CF:

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1997 Cherokee Sport, AW4, NP231 w/AA SYE, 4.6l stroker, MC Coursers 35's on soft 8's, 4.88 gears, locked, RS mids/DBO front/rear stiffeners, Serious 1 ton OTK steering, JKS adj. trackbar/OTK mount, RE frame side TB mount, RockKrawler 3 link, 5.5" RE springs, Bilstein 5100s



My build thread:
https://www.cherokeeforum.com/f46/ro...2/#post3219889

 

You could do a "search" on this particular sub-forum on that code, as a couple of years back, a member who is still active had that issue, and the thread was about 30 pages long

He was very determined to get it fixed, I cant recall if it generated a CEL light, which means a fault that needs fixing for Inspection

To the best of my recollection, it may have been a Cam sensor, even though he had replaced it, but i could be wrong

It is best to use Mopar sensors as those 2 are critical, and cheap repros known to be weak