Question about 2000 Jeep Cherokee

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I have a 2000 gran cherokee limited recently my check engine ligth came on .the computer said it could be a defective relay or poor ground conditions but idont know wich relay is defective. i need some help

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  • Roberta Smith
    Roberta Smith May 11, 2010

    what is not working... or what circuit did the codes say it might be ?



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To begin with, did you check the ground system? Make sure that the ground wire that attaches to the block is clean and making good contact (remove it and clean with sandpaper) at both the battery and block itself. Also check any secondary grounds such as the small ones that attach to the fenders and firewall. (generally, I run a 12ga wire from battery (-) terminal and attach it to firewall and both fenders to insure no ground problems.) Make sure that power distribution center is properly grounded as well.This may be through a ground bar attached to fender or through wiring to relays.
As for relays, you need to isolate a particular relay to determine if good/bad. Likely you may not have to go this far if problem does not happen again once everything is grounded properly.

Posted on Mar 03, 2009


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1 Answer

Code P1388 and P1399

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Jun 27, 2016 | 2000 Jeep Grand Cherokee

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When I go to crank 2000 jeep Cherokee limited the fuel gage works sometimes and it will only run for about three seconds what's wrong?

The computer grounds the fuel pump relay for 3 seconds to boost fuel pressure on start-up. If the computer does not see oil pressure or RPM it will not continue to ground the relay.
You would need to bypass the relay and see if the pump continues to run, then check the relay and the ground signal from the computer.
The gas gauge problem may be connected or something different.
The connector at the gas tank may be faulty which would affect both the power for the pump and the fuel gauge sending unit.

Sep 21, 2012 | 2000 Jeep Cherokee

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1999 Jeep Cherokee Sport wont shift into overdrive P1491

P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
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Check ot and keep us updared.

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Where are the window relays located on a 1999 jeep gran cherokee limited. the drivers window and the driver's side rear passanger window do not work

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Hope helps (remember rated this post).

May 27, 2010 | 1999 Jeep Grand Cherokee

1 Answer

I have jeep gran cherokee laredo 2000 engine 4 liters my engine fan no work a i check direct my fan and work i chech the fuses is ok and relays to

Check your temperature sending unit. Here's how it works: sending unit sends a message to the computer telling it it's hot. Computer sends a ground signal to the relay that in turn completes the circuit to the fan. If the temp sender does not do that and the computer, fuse, relay and wiring are good, the fan won't come on.

Feb 13, 2010 | 2000 Jeep Grand Cherokee

2 Answers

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

Mar 25, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Flashing Headlights/interior Lights

Could be a bad light switch or relay, but I'd check dash and body grounding first. On every Jeep I've ever owned, I run a direct ground to everything before I even drive it. To do this, Attach a 12ga or larger wire to the battery ground connector. Run that wire around the firewall side of the engine bay, removing insulation at several points and attaching the exposed wire to the firewall, (using short, self-tapping screws) both fenders and ground points for the computer. I also attach one additional leg which runs through the firewall (careful not to drill through anything important) and attaches to the metal frame of the dashboard. I also add a second ground wire directly to the engine block, eliminating any possibility of a poor ground anywhere. It sounds like a big job but it's not, and doing this precludes many frustrating and unnecessary problems down the road!

Nov 04, 2008 | 2006 Jeep Grand Cherokee

1 Answer


When the engine is at operating temp check the electric cooling fan. If it is not moving then i would check the fan relay which is located under the right side headlamp. 9 times out of 10 this is the problem

Aug 20, 2008 | 2000 Jeep Grand Cherokee

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