Question about 2001 Jeep Grand Cherokee

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Code 1391 Replaced crankshaft sesor and still getting code1391 could it just be loose?

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  • Richard Scordino Jul 07, 2010

    could be a slightly corroded pin terminal at either end of the harness, a harness that is worn through and intermittently shorting on something or in extreme cases (I've only seen one or two) the thrust bearing on the crankshaft is worn and the sensor is not always aligned with the flywheel all of the time. That code also relates to the cam sensor so make sure that is in good condition as well.

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This code states there is an intermittant loose of the Crankshaft sensor OR the camshaft sensor. Check the connections on the camshaft sensor and be sure they are clean and tight. Otherwise, you may have a bad connection internally or you could have oil inside due to it is mounted in the oil pump assembly (leftside, middle of engine) and is easy to get too.

Posted on Jul 08, 2010

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My pt cruiser has code 1391. i changed cam sensor crank sensor wires plugs and coil still getting 1391 code and from 0 mph to 20 mph car skips and revs up any ideas?


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There are a few causes that can trip that code.

- Crankshaft position sensor harness is open or shorted
- Crankshaft position sensor circuit poor electrical connection
- Faulty crankshaft position sensor
- Signal plate may be damage
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That code is Intermittent loss of camshaft positon sensor OR crankshaft position sensor. It would suggest to me that perhaps there is dirt obstructing the signal or possiblr wiring problems. A loose connection, corrosion, perhaps a bare spot on a wire. I'd check this stuff carefully before I started spending on new sensors. Hope this helps.

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What is code 1391 for on 1999 jeep grand cherokee


Code 1391 = An intermittant loss of CMP (crankshaft position sensor) or CKP (crankshaft position sensor. This code could be related to just a bad connection at either sensor or the wiring harness, check the connections and be sure they are clean and tight fitting with no loose wire connections also within the connector itself. Otherwise you may end up replacing one or both of theses sensors to correct this issue,unless you have an oscilloscope to isolate which sensor.

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P0700 its a transmission codefrom what i understand while the 1391 is a crank postion sensor. the P0700 comes up when the neutral safety switch starts to fail, but the crank postion sensor...to get that error code, means you timing could be off..have you replaced a timing belt lately, if so, it might be a couple of teeth out, that might do it. i would check the sensor too though

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Engine keeps missing. unknown codes


Code 1682 indicates low battery voltage. This could be a problematic alternator, which would likely cause misfiring. Autozone should be able to check this for you for free.

Code 1391 indicates the computer can not see the crank or cam sensor signal. This would likely be a result of the misfires.

Code 0320 indicates the crankshaft position sensor reference signal could not be found while the engine is cranking.

All of these issues point to either a cam/crank sensor malfunction or a charging system problem, either or both of which could cause the misfiring.

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