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Posted on Apr 17, 2011
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2002 liberty 3.7 engine has a p0340 and p1391 codes. the car will start, could one of the secondary timing chains be broke?

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  • Anonymous Jan 25, 2013

    2002 liberty 3.7 engine has a p0340 and p1391 codes. the car will start fine but after it's warm it stats making a werd noise. i replaced boh the Cam and the crank sensors with morpar sensors and it still seems to have a problem. Anything someone can help me with.

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  • Posted on Apr 17, 2011
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I would check the cam sensor first before going any further.

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0helpful
1answer

2003 Jeep Liberty check engine codes P1391 and p1698
Both point to a problem with a module rather than a sensor. We have an auto-electrician Expert here and hopefully he will be along. The first thing to do is clear the codes and see if they come back. If they do, you need a good auto-electrician, not a mechanic and not a guy from Autozone.

This tells you what causes P1698.

P1698 JEEP Code - PCM Fault No CCD Message From TCM

https://www.engine-codes.com > p1698_jeep
'P1698 JEEP code possible causes · Faulty Transmission Control Module (TCM) · Transmission Control Module harness is open or shorted · Transmission Control Module ...
This tell you all the items that can cause P1391.

P1391 JEEP Code - CMP or CKP Signal Intermittent Condition

https://www.autocodes.com > p1391_jeep
'P1391 JEEP code description ... The Powertrain Control Module (PCM) monitors the Camshaft Position Sensor (CMP) Or Crankshaft Position Sensor

..
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Feb 26, 2022 • 2003 Jeep Liberty
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How to fix 2002 jeep liberty limited right side tensioner chain is too tight and won't extend to allow installation of tensioner arm and tensioner?
release the automatic tensioner. strip down and retention
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Jan 26, 2016 • 2002 Jeep Liberty
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Where is the camshaft position sensor on a jeep liberty 2.5 crd. car doesnt start show fault code p0340
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Apr 30, 2014 • 2002 Jeep Liberty
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Changed engine but now wont start and gives P1391 P0340 P0320
the codes as related to the oxygen snsors . now here is what I would do . replace all four or how many you have . it will be guaranteed that you fix the problem . oh don't forget to remove the codes after repairs are done. you also need a special socket to remove the sensor.
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Mar 12, 2014 • 2002 Chrysler PT Cruiser
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Neutral safety switch?
You need to have a repair shop properly diagnose the issues
You don't have the knowledge or tools to work on those issues
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Jul 24, 2013 • 2003 Jeep Liberty
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2002 liberty 3.7 engine has a p0340 and p1391 codes. Replaced Cam and Crank Sensors w- Morpar parts and still having a problem.
Trouble Code: P1391

CKP Or CMP Sensor Signal Intermittent

Possible Causes:


Camshaft Sensor is not installed properly.Engine valve timing is not within specifications.Perform a CKP and CMP Sensor relearn with the scan tool.Tone wheel or pulse ring is damaged.

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Jan 25, 2013 • Cars & Trucks
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P1391 c0de 2002 dodge ram van no start
Code P1391 Loss of crank or cam sensors,P0340 No cam signal at the pcm. I would replace the crank sensor first. Your cam sensor is part of the dist. on 5.2/5.9 engines.
Hope that helps.
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Mar 16, 2010 • 2001 Dodge Ram 2500 Truck
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2002 jeep grand cherokee with 4.0 engine will die but restart
I do not know what the error codes mean but know that When I has the sme problem with my jeep it was the fuel pump. What happens is when it heats up it es less and less fuel and chokes the engine. When cold it runs better. remember gas in the tank helps cool the pump but sounds like your pump needs replacing as it is starting to give out.
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May 13, 2009 • 2002 Jeep Grand Cherokee
1helpful
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P0340 code in my Jeep Liberty 2002
Since a P0340 Could be either the Cam Position Sensor or The Crank Position Sensor they are obviously in 2 different spots, however they both either sit on the back of the engine or on the transmission bellhousing. Your Cam Sensor is at the top and your Crank Sensor is near the bottom.

Hope this gives you some direction. Thanks for using FixYa!

Sincerely,

JC
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Nov 21, 2008 • 2002 Jeep Liberty
1helpful
5answers

Known problems
on a 2003 jeep liberty sport 3.7 liter getting codes of p0340 and p1391. its a reman motor. first 600 miles of break in we had no problems then we did a oil and filter change. we ffirst got the p1391 code and changed both the cmp and ckp sensor and ended up with both codes.
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May 14, 2008 • 2002 Lincoln Blackwood
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