Question about 2003 Jeep Grand Cherokee

1 Answer

2003 Jeep Grand Cherokee jerks hard then the rpms go high then almost to zero

While driving at speeds 50+ my jeep will jerk hard, then the rpms will go from about 3000 to almost zero. When this happened two weeks ago, all of the warning lights came on except the check engine light. The Jeep would not restart, had to have it towed to mechanic\'s shop. They kept it for 2 weeks, cleaned the battery cables, and could not get the jeep to act up again. Yesterday while driving home, it did it again. This time, however, the gauge lights did not come on and I was able to creep home. Any ideas?

Posted by on


1 Answer

  • 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

Which engine?
sounds to me like you need to watch the dash voltmeter
if it reads zero , running the PCM , and spark all die
as does engine stall.. so that is first. Voltage.
if the gauge is missing like on some cars, (sad) add one
or connect any voltmeter to the CIG lighter socket (aka. power port today)
or go to any auto store and buy the cheap tool that fits there.
called a battery/alt tester (some have LEDs that shift to good , bad)
a real voltmeter works better showing real volts.
When and engine dies. the PCM sees this, and tries everything
in its power to stop that, (fuel and air supplies)
but failed. as the PCM falls below the 300 RPM it knows it lost the battle and then goes to boot up self tests. with the CEL glowing
if it fails to show the CEL, (stalled) that means in all cases...
the PCM lost power.
lost DC power distribution. for many a reason.

from loose or bad fuses, or bad ignitions switch or as per above
filthy battery lugs.
how i fix these, (sure it must fail to fix it....... or go broke guessing)

  1. i drive with the voltmeter connected full time. per above.
  2. I say it drop. to 0v driving. oops. that is bad.
  3. I then move the red test lead (black is on body ground)
  4. I move it forward in the path of power distributution, that means to the fuse box in cab that runs ECU power.
  5. I then see if the power is lost before that fuse or after.
  6. i before i work to the engine bay main fuse box. PDC.
  7. I then find the point power does not drop
  8. the failure IS between those 2 points,!!!

Posted on Mar 20, 2014

  • 2 more comments 
  • K Nelson
    K Nelson Mar 21, 2014

    Will give that a shot. Thanks.

  • _-__-___-_
    _-__-___-_ Mar 21, 2014

    2 things; make sure you dont loose 12vdc power, running, and make sure the ASD relay dont drop out, running. just 2 things, to find cause stalls, if it neither those then the engine is stalling for the other 25 reasons, MISFIRE tips list or fuel starvation. there are tests for all possible failures , in the most part.

  • _-__-___-_
    _-__-___-_ Mar 21, 2014

  • _-__-___-_
    _-__-___-_ Mar 21, 2014

    keep in mind the ASD does drop with loss of DC power, so DC power is always top of list.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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:

1 Answer

My 1997 Jeep Grand Cherokee Laredo front wheel drive my car is got a rough idle keeps backfiring and will not get up to speed it keeps jerking

run the fault codes and check for problem cam/crank position sensors or sensor wires and connections

Aug 01, 2016 | Jeep Cars & Trucks

1 Answer

Jerking when accelerating

we cant drive car, so jerking is not clear to a non driver.
first off , ill guess there is no odd noises.
and that means jerking can be 2 things (sure more but)
engine jerks, does it only?
or transmission slips then stops slipping resulting in a jerk.

get it serviced, with persons that can drive and experience this live.

Mar 18, 2015 | 2003 Jeep Grand Cherokee

1 Answer

2000 v 8 What would cause the rpms to flutuate while driving and be high when in park?

My Jeep Grand Cheroke Limited 2000 did the same thing and the dealer replaced the O2 sensor and problem was solved. It about drove me crazy until it was figured out.

Jul 03, 2014 | 2000 Jeep Grand Cherokee

1 Answer

1995 jeep grand cherokee laredo jerking at 50 mph

which engine? (asked now 1000 times, only 2 ever answered)

tune up time, spark parts, rotor to plugs. filters. both.

its called a 60k mile tune up solves most.

my guess, is its misfiring or

is this the ASD relay dropping out then back in, as driven.

jerked before and after CKP sensor, did you know its the last thing to fail......

see the list of ASD drops.

misfiring, can be felt, its like a misfiring chain saw, ever here a 2 stoke misfire, ratta, tata ,tat?

some call it jerking, its not, is misfiring. (3reasons ) and 25 causes.

but jerkin real, like if you cut the ignition that is and instant bog.

but if you off the key and back on , fast, that be a jerk

that is total power loss. not misfire. its loss spark and fuel.

and jerks hard.

so does loss of 12vdc to the EFI system.

so the first step is to see if its the ASD relay dropping out.

on all jeeps.. 93 to now.


automatic, shut down. (relay and EFI logic)

key point, the ASD will kill the engine, if fit sees spark is bad.

so its a chicken and egg deal.

here is the logic.

key on , crank , ASD closes, fuel injects and engine starts

then dies in seconds. or runs full time.

note that if the ECU sees spark dead, it cuts spark.

Sounds odd , huh. but is NOT.

this relay stops all car fires. (caused by this protection not in place)

Apr 02, 2014 | 1995 Jeep Grand Cherokee

2 Answers

Cherokee just stops. Driving slow, fast, uphill,

Have your timing checked out, and check if you have any MIL codes.

I’m happy to help further over the phone at

Jul 11, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Transmission Slight Jerking When Slowing & Accelerating

Have you changed the trasmission fluid and filter in your jeep lately, if not do so and that just might stop the jerking in your jeep, and if that does not do the trick you will need to have your trasmission checked out by a trasmission shop.

Sep 08, 2009 | 2005 Jeep Grand Cherokee

1 Answer

2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.

I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.

May 31, 2009 | 2004 Jeep Grand Cherokee

2 Answers

Grand cherokee jerking movement

I have a 2000 Grand Jeep Cherokee, I was driving along the freeway maybe doing about 60mph when my jeep suddenly jerked, when it did this my emissions light came on. I pulled over in a parking lot checked all my fluids oil, transmission fluid, everything seemed okay, as I was getting back on the freeway I watched the R PMs that was fine and my emission light went off. After driving for about 5 minutes it did it again and my emissions light came back on, I did notice this time it seemed to be in the rear where this Jerking/ Bucking came from can anyone help??? PLEASE

Mar 06, 2009 | 2000 Jeep Grand Cherokee

Not finding what you are looking for?
2003 Jeep Grand Cherokee Logo

140 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

80608 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

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

Answer questions

Manuals & User Guides