Question about 2000 Jeep Grand Cherokee

5 Answers

2001 Jeep Grand Cherokee code P1391

I have a 2001 Jeep Grand Cherokee 2WD with a 4.0 engine and auto transmission, I am getting code P1391. I have replaced: camshaft position sensor, crankshaft position sensor, spark plugs, gas cap, and ECM (computer). But I still ge code P1391, when driving down the road the engine starts sputtering, pulled over, rev engine as long as high RPM sounds fine, let off gas at 1500 RPM started trying to quit, drove it to have codes checked and cleared, restarted and drove home did code check again showed code P1391, what do I need to do now

Posted by on

  • 4 more comments 
  • gailandjt Mar 27, 2009

    The timing has been checked, it is fine.

  • gailandjt Mar 27, 2009

    I guess I felled to mention that the timing had been checked and it is fine

  • Sheila Smart
    Sheila Smart Nov 06, 2013

    having the same problems

  • Anonymous Mar 14, 2014

    1998 jeep cherokee runs great check engine code is p1391

  • Anonymous Mar 19, 2014

    ran fine quit wont start getting gas and spark 4.7 motor

  • Anonymous Mar 28, 2014

    codes: p1391, p0300, p0303, p0304,p0306



5 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 837 Answers

I would check to be sure that the timing chain hasn't jumped at all ..

Posted on Mar 25, 2009

  • 2 more comments 
  • Anonymous Mar 25, 2009

    Why would you rate this as Inappropriate? Did you check your timing?

    My suggestion is you rotate your distributor ans see if you can make the engine run smoother .. if so .. you have a timing problem.

  • Anonymous Mar 27, 2009

    Have you checked the timing/timing chain yet?

  • Anonymous Aug 23, 2015

    WJ jeep 4L inline 6
    OMG, its a 2001 not 93-98 !!!! sorry. fella.

    i guess you've never seen a 4L engine>.
    do not mess with the distributor. 1993-1998
    but in 1999 that ended, same HERE.
    and has a 3 coil coil rail pack
    Sorry no Distrib now.

    and these engines do not drop chains.
    like some chezzy rice burner.

    1391 is cmp/ckp failure. try to focus on that.?

  • _-__-___-_
    _-__-___-_ Aug 23, 2015

    think this chain fails, not often.
    but miles on engine would help and not stated. this is 4L robust short chain.


  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I have this problem haven't changed the sensors yet I have error codes p0340 p0320 p1391 what should I do??????

Posted on Apr 19, 2012

  • Anonymous Aug 23, 2015

    please dont piggyback. start fresh post.
    fixing 2 engines same time 1 thread, is crazy.?


  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 9 Answers

You may have a bad coil pack , that's what fixed mine.

Posted on Oct 10, 2014

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

My Wrangler did the same thing. Turned out a battery problem from yrs ago (leaked onto the harness) had eatten into the harness and was shorting out. In fact, several wires were shorting.
BTW, you can not time these motors. In my 40 yrs of building Hot Rods and Rock Crawlers, I've NEVER seen a rig "jump time" and not require MAJOR valve/piston/EVERYTHING work.
I;m sure your efforts are appreciated but they are not helpful or needed.

Posted on Jul 25, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Jeep Master
  • 20,706 Answers

To other posters, omg, its not a wranger, nor is it a 1993 to 1998 grand Cherokee, its a 2001, read the post again,,
the 4.7L is overhead cam, the 4.0L IS NOT. so has no head cam or head chain, that like to fail...
stop guessing please.
that is a factory DTC code P1. is that. (means dont read GM codes for that, only jeep , only 4L)
even the engine stated, like first time here ever, it seems.?
4L (1 of 5 million made)
so how to work sensor errors,
sure a loose cam drive can cause the cam sensor to go nuts.
but not common on 4L.
so can , wires to the sensor bad, (look yet) and a dirty (metal mud) contaminated sensor ( clean it? )
the real problem is our scan tools can not see the deeper codes
for is it the CMP or CKP failing SEE????????
it just says both.
many here hate books (sad to watch) but is covered in the freakn book. in depth....
the 2001 CMP is where the old distributor WAS.
see that on center of left side of block
and it can fail. sure.
it is gear driven just like the distrib. was before 1999.
first a warning in the (factory book)
On the 4.0L 6-cylinder engine, do not attempt to
rotate the oil pump drive to adjust timing. This
adjustment is used for fuel synchronization after
camshaft position sensor replacement.
got that? so if replacing THAT, it needs to be timed, for fuel injection POINT. (the method takes a toothpick, ask)
now the CKP (no factory scan tool, so DIY folks must guess)

the CKP must not be just fiddle with or swapped
the method if adjusting it and the spacer.
both sensors are HALL sensors.
on the old engines the CKP was very fussy 2 wire coil sensor
tuned like a radio . and very weak signals! not now ,.

now the rules for messing the CKP, 4.0L ONLY !
The sensor is adjustable
and is attached with one bolt. A wire shield/
router is attached to the sensor (Fig. 21).
(1) Disconnect sensor pigtail harness (3-way connector)
from main engine wiring harness.
(2) Remove sensor mounting bolt.
(3) Remove wire shield and sensor.
The Crankshaft Position (CKP) sensor is mounted
to the transmission bellhousing at the left/rear side
of the engine block (Fig. 21). The sensor is adjustable
and is attached with one bolt. A wire shield/
router is attached to the sensor (Fig. 21).
New replacement sensors will be equipped with a
paper spacer glued to bottom of sensor. If installing
(returning) a used sensor to vehicle, a new paper
spacer must be installed to bottom of sensor. This
spacer will be ground off the first time engine is
If spacer is not used, sensor will be broken
the first time engine is started.
(1) New Sensors: Be sure paper spacer is installed
to bottom of sensor. If not, obtain spacer
(2) Used Sensors: Clean bottom of sensor and
install spacer PN05252229.
(3) Install sensor into transmission bellhousing
(4) Position sensor wire shield to sensor (Fig. 21).


i post all this for 1 reason
if you mess with both sensors and dont know how to adjust them
you just made it worse.! sorry but that is a fact.
the cam is loose. (not very likely on any 4.0L
the cmp is misfiring
the CKP is misfiring.

that be it.
if for sure not other codes,,,, this poster shows ONLY one DTC code, so we must believe that.
I drive and log codes.
while it misfires. and win. and see all codes.
some clear fast. (a secret about spark codes many dont know)

one needs to look for ALL P03xx codes. running !!!

Posted on Aug 23, 2015

  • Anonymous Aug 23, 2015

    i have more, lots more, if you had gone to the dealer , he can scan it (if failing now)
    and see which sensor is failing. sure can.
    I'm not a proponent of any stealership EVA!

    but if you buy your own scanner and drive while engine is running and misfiring!
    you will see P0320 or P0340!!!, with 1391's
    LIVE FAILING and 320/340 correcting in SECONDS. (that is its way, logic....)
    this is how can PCM's work, (i repair PCM's+)
    320 is crank
    340 is cam,
    now you have 1/2 the work, to find cause.

    think of 1391 as and echo of the past.
    and the other two, LIVE FAIL NOW.

    here are some other facts.
    you failed to look at the FREEZE FRAME
    it will (may) show which sensor failed, at 1391. LOOK and WIN?

    or PENDINGS. this shows marginal failures.
    if say you say P320s, pending
    well, you know the crank sensor is failing.
    the key to finding bad things here.
    is to SCAN AND DRIVE.
    or spend eternity gue$$ing.

    so trips to the zone and simple scans don;t work, what is new there?
    find a REAL ASE shop and get them to scan it failing LIVE.

  • Anonymous Aug 23, 2015

    PS> try not to make it worse.
    it easy , with both CMP and CKP.
    timing and the tricky gaps.


1 Suggested Answer


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

Need to find a diagnostic code for my 2001 jeep grand cherokee

Service engine soon lamp and check engine lamp have a 16 pin connector under dash in drivers area most parts store can retrieve codes for you for free these codes are in several forms P series are powertrain codes (engine,transmission) B series codes are Body codes ( A/C,electrical windows mirrors) C series are Chassis codes (abs,transfer case, air ride) U series codes are Communication codes between all modules that need to share information..

Oct 04, 2014 | 2001 Jeep Grand Cherokee

1 Answer

2008 Jeep Grand Cherokee Limited 5.7 Hemi Check engine light on, code P0750

2008 jeep cherokee (hemi) engine light its on i brought to fix they change 4 sensor and the converter. After 5 days engine light comes on again, what else can be? im depress about it, after paying almost 2 grand to fix this issue.

Jan 25, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2001 jeep check engine light on. How to get codes

I usually recomend going to your local "Mc Parts" store, like Advanced Auto, or Auto Zone. they usually provide this service for free and are often corect about what the problem is.

Jan 07, 2014 | 2001 Jeep Grand Cherokee

1 Answer

What grade of transmission oil do I use for a 2003 jeep grand cherokee crd

The obvious answer to that would be to look in your Owner's Manual.
If you do not have an Owner's Manual, you can get one at:

The service manual lists two types depending on which engine your vehicle is equipped with:

4.0L Engine requires ATF Plus 3 or ATF Plus 3 Type 7176
4.7L Engine requires ATF Plus 4 or ATF Plus 4 Type 9602

Jan 08, 2012 | 2001 Jeep Cherokee

1 Answer

I have a 1998 jeep grand cherakee lorado 4.0l engine 4 wheel drive and i would like to know what other years of jeep are compatable for a used transmission?


Aug 04, 2010 | 1998 Jeep Grand Cherokee

1 Answer

2001 Jeep Grand Cherokee won't shift out of first gear and the fault codes are P0733 and P0734.

P0733=Gear 3 Incorrect Ratio
P0734=Gear 4 Incorrect Ratio,
your transmission is in "limp" mode,
Have the following sensors checked on the transmission,input sensor,output sensor,and speed sensor.
The transmission is not getting a signal from one of them,So it doesn't know how fast your going so it doesn't up shift.

Jan 22, 2010 | 2002 Jeep Grand Cherokee

1 Answer

2001 jeep grand cherokee engine light came on

you need to get the codes read to know why the light is on,

Jan 08, 2010 | 2001 Jeep Grand Cherokee

1 Answer

2001 jeep gd. cherokee larado 4.0 4wd auto. when

Have you run an engine control system fault code test? If not do that first.

Jun 08, 2017 | 2001 Jeep Grand Cherokee

1 Answer

1995 jeep grand cherokee auto trans prob

sounds like the transmission is in "limp"mode it allows you to drive even though there is a problem with the transmission,the code 21 is probably a transmission manufature control code and not engine go to autozone and they can scan it for free,if you just had transmission fluid changed recently if you used anything other than what the manufature calls for like atf+4 then this is your problem,flush the system and do a fluid and filter change with correct fluid as by what the owners manual,or dealer calls for,don't rely on autozone to get it right.

Dec 25, 2008 | 1995 Jeep Grand Cherokee

Not finding what you are looking for?
2000 Jeep Grand Cherokee Logo

10,725 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

85222 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides