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Unread 12-13-2010, 10:04 PM   #1
coreyp
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2004 KJ Liberty 
 
Join Date: Jan 2010
Location: Monmouth, Monmouth IL
Posts: 2
04 Liberty V6 gas check engine light

The problem is with my parents 2004 jeep liberty with about 79000 miles.It is showing three trouble codes codes,code one P0301,code 2 P0562 and code 3 P700.I took it to Autozone and had them read them and they gave me generic print out of what the codes mean but I was hoping somebody could explain more about them and what is causing the code and how to fix it.

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Unread 12-14-2010, 12:04 AM   #2
SabaII
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2002 KJ Liberty 
 
Join Date: Aug 2010
Location: Rochester, Minnesota
Posts: 215
Well from what I get with a quick search is that p0562 is system voltage low. Bad battery? Did the car sit with a light on or something killing the battery? P700 with again a quick search showed Trans Control Malufuntion. That could/may be cause by the low voltage. On newer cars when a battery dies it can play with the computers. I would have the battery checked/replaced. The codes should clear with the battery unhooked and you can see if the p700 comes back. My guess is it wont but I wouldn't chance that. Double check it. The other code is a cyl one misfire. Have the plugs been replaced. If not its a good time. If they have recently been done I would double check them. Make sure the gap is ok. Also check the tubes (wires if you wanna call them that) in between the coils and plugs. They can go bad. Other then that I would check the individual coil. Make sure it has power. Ohm it out.
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Unread 12-14-2010, 07:38 AM   #3
LibertyTC
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2004 KJ Liberty 
 
Join Date: Sep 2008
Location: Vancouver B.C.
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One thing is certain, if you got low voltage, the KJ is not going to be happy about it, and it will throw codes.
First check the battery electrolyte level (if battery has removable caps) and fill to above cells if low, not all the way to top, with distilled water. Clean the terminals if corrosion present.
Manually charging a weak battery for 24 hours at 2 amps and then having a load test done on that battery is in order. If battery replacement is required find one that has a higher rating at 800 CCA (cold cranking amps)
Also ensure that the alternator is putting out more than 14.5 volts while running.
Then clear the codes, and see if anything else shows up.
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Unread 12-15-2010, 12:25 AM   #4
SabaII
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2002 KJ Liberty 
 
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Location: Rochester, Minnesota
Posts: 215
More then 14.5v? Thats getting a little high IMO. I like to see them 13.2v-14.5v. Most vehicles volt gauges the red starts at around 15v. You dont want to cook your battery.
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Unread 12-15-2010, 08:21 PM   #5
DaveJKJ
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2005 KJ Liberty 
 
Join Date: Nov 2008
Location: stuck in the mud again
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^^14.6 is within spec for charging voltage with the jeep running and alternator charging..
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Unread 12-15-2010, 10:04 PM   #6
coreyp
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2004 KJ Liberty 
 
Join Date: Jan 2010
Location: Monmouth, Monmouth IL
Posts: 2
I checked that battery without is started and it read 12.3V and started it read 14.5V so the alternator probably isn't the problem.I'm starting to think its the battery since its the original one.As for the misfire I still need to check the spark plugs,but it has been cold and snowy today so I'll try to check them Friday when I don't have to work.
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Unread 12-17-2010, 10:03 AM   #7
SabaII
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2002 KJ Liberty 
 
Join Date: Aug 2010
Location: Rochester, Minnesota
Posts: 215
Quote:
Originally Posted by DaveJKJ View Post
^^14.6 is within spec for charging voltage with the jeep running and alternator charging..
I know it is within spec. Its just on the high side. I spose though these may be different from what I am used to working on. Highest we see on average is 14.1v. And that is out of the smaller freightliners. The larger class 8 trucks usually run around 13.8v. Anyways to keep on topic corey my suggestion would be to clear the codes and see what comes back. Maybe the battery got drained at one point and the computer saw and logged that code. Then the trans controller got messed up due to low voltage so the computer logged that code as well. I dont believe the misfire problem is part of that though. Thats more then likely a separate issue. Also if the scan tool you are using is good enough it should be able to show you counts on the codes. Everytime the computer see's that problem it logs it and adds a count to it. If you only have one count I would not worry about it. If you have multiple counts thats when I would do something.
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