Question about 2000 Jeep Grand Cherokee

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I have a 4.0 Litre Jeep Grand Cherokee Automatic. On local runs she drives great. However, when we take her on long runs (over 50 miles) the OD (overdrive) light comes on, she down shifts a couple of gears and the Transmission Overheat Light comes on. She will run fine in this mode but the fuel consumption is horrendous. Had the engine and gearbox oil and filters changed but she is still doing it. Anyone got any ideas as to the cause, and of course, the solution?

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  • 40 Answers

Sounds like your transmission or lockup converter is slipping. The slipping causes heat and it is downshifting out of overdrive as a built-in protection strategy. Get the transmission looked at ASAP before you get stranded because it's stuck in a downward spiral right now. The problem could be caused by a stuck solenoid, which is a relatively cheap fix, but the more you drive it like this, the more you're working toward a full, expensive rebuild.

Posted on May 07, 2014

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Posted on Jan 02, 2017

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SOURCE: 2000 jeep grand cherokee limited starts in 3rd gear

oil pressure problem should be checked independently of other problems...Use a good accurate mechanical gauge to check. If pressure is good (no less than 15psi at idle hot (I prefer to see at least 20) check dash grounding, block ground and if OK, change sending unit. Dash and body ground can influence operation of shift and body control modules so indirectly your problem may or may not be related, depending upon what you find while testing. And it could turn out to be a defective module! They are expensive and just plugging new ones in may work, but then again, it might not. I might be totally incorrect on this...that's the value of actually being there instead of doing this by "remote control".
If you read the numerous posts pertaining to all vehicles, you will see that you are not alone with electrical problems...As long as the engineers who design this stuff, keep using "modules" to replace ordinary simple and reliable systems, we will continue to have these problems. Do some testing and I'm sure you will find a solution! (I'm still waiting for someone to make a program for a PC that will give a complete readout of every system in a vehicle, including exact faults instead of general system "suggestions")
Good luck

Posted on Apr 07, 2009

  • 3 Answers

SOURCE: 1999 jeep grand cherokee / 4.0 L.

The door security has nothing to do with the jeep no starting. Check your electrical leads and also terminal leads that run to the battery. If you can, get your battery and your alternator tested to see if theyre any good. If your dash indicates the following while driving;" Transmission Overheat", then, with the engine running, check your transmission fluid level. If the transmission dipstick indaictes that the amount of fluid is low add maybe a quart to it. if you do this again and you find thats its doing the same thing, then there might be a couple of things wrong;

- 1. You may have a leak somewhere. Check your lines and check around the transmission pan. If you find a leak around the pan, than that means that you need a transmission filter kit. This includes a pan gasket and filter.

- 2. If you lift the hood and look over to the left (standing at the front of the car) and find the reserve tank to have a dark color liquid in there, open the top and see what color it is. If it smells and looks like Transmission fluid, then that means you have a busted radiatior. If you open the radiatior cap and look down into it and see the that the color of the fluid is a pepto bismal- looking color, then its deffinatley time for a radiator replacement and flushing of old fluid out of the system.

-3. Transmission is burning up gears and needs to be replaced. i dont know what jeep was thinking when they put a three speed transmission in a car of that size that idles high beacuse of the gears, when it should be a five speed that idles lower being thats a bigger size car.

-4. Check your fuel lines and your fuel filter.

-5. The sensor that sends a signal to the number one cylinder to fire may have gone bad and needs to be replaced.

Posted on Nov 24, 2008

  • 88 Answers

SOURCE: od drive and transmission overheat warning light

hi first of all check the temp sensor on the auto box.also check transmission oil cooler that it is not blocked.when the computer for the auto box detects a problem it turns off the over drive.

Posted on Oct 14, 2008

  • 57 Answers

SOURCE: 1999 jeep grand cherokee laredo 4.0 litre

OK here we go you will need a test light for the following tests, i will try to be as descriptive as possible so lets get started

fist start the engine and turn on the a/c that should command the fan on.
right front engine compartment next to the battery is the power distribution center pop off the top, ground your test light to the negative battery terminal and find fuse number 10 it is a 40 amp fuse check both sides of this fuse with your test light, if you have power on both sides of the fuse than we shall go further.

unplug the connector from the cooling fan, there should be two wires in the plug one is dark green and the other is black with a pink tracer, with your test lite grounded to the negative battery terminal check the dark green wire for power, if there is power there than move your test light ground clamp to the battery positive terminal and test the black wire for ground,
if testing the black wire made the test light shine than the ground circuit is good, if it did not than check you ground connection behind the right headlight.
when testing the dark green wire, if the dark green wire made the test light shine and the ground circuit is good than you simply have a bad coolant fan motor.

I suspect you were not getting power to the fan motor so you will need to take a look at the radiator fan relay, this is a special solid state relay mounted to the inside of radiator core support on the right side down behind the bumper.

here you will find a single plug with 4 wires in it

black = ground
dark blue / pink = relay controll from pcm
dark green = output to radiator cooling fan
gray = battery power from fuse # 10 in pdc

unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.

move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.

good luck

wesley schacht@hotmail.com

Posted on Jun 14, 2009

  • 70 Answers

SOURCE: 2002 Jeep Grand Cherokee 2.7crd engine light/ no gear changes

your transmission is in "limp home" mode, the problem is one of the sensors on your transmission. you need to have an obdII scanner connected to read the codes stored in your vehicles computer. this will tell you which sensor has failed

Posted on Nov 25, 2009

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