Anyone had fault code P0700 and P0740? I changed the trans oil and filter use ATF+4 cleared the codes but eng ck light came back on. It's ok driving around town but on the freeway above 55 mph light came on. Went to the dealer and talk to the mechanic that work on it and he did a transmission verification test and couldn't fine anything. He changed the temp range sensor but that didn't help he suggest changing the trans oil cooler which is seperate from the radiator. So today I install a HD oil cooler the stack plate type like a radiator but no help chk lite still comes on above 55 mph. The dealer was cool they didn't charge me any labor or test that they performed only charge me for the temp sensor $51.00. Any suggestion? Trans runs smooth and shifts like normal. Should I take it to a trans shop or back to the dealer? Liberty is a 03 with 42RLE Trans.

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2002 Liberty
W/Lift+Armor+Diff mods

P0740 is a failure of the torque convertor clutch lock up system (TCC/PTU solenoid) Thats why you are getting it out on the road I would assume ( above 55) as the convertor is not locking up or can you tell if it is or not???

P0700 Is the EATX controller DTC present The EATX controller has an active fault

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

shouldn't the dealer know these codes?

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Jason
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But that would make sense!

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2003 Limited, Silver - L.O.S.T. # 068957 Rockies
http://www.cardomain.com/ride/2127390/14
2006 Kawasaki KLR650

You may need to have a transmission relearn done,the dealership can only do this,via the DRBIII scantool.It seems that whenever the pan is dropped in a KJ,42RLE or 45RFE,it doesn't act like it used to and a tranny relearn will eleimate that,it's worth a shot.

Wouldn't unhooking a battery (say overnight) do the same thing. Because it resets the pcm.

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

No,also disconnecting the battery(for any length of time)will not totally reset the PCM either,some codes you can't just erase that way.

Yes theres a lot of codes that the computer retains just like a home computer when you go to that ..........well that site that your wife better not find you at!

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

if there is nothing wrong with your KJ, then take the cluster out and put some black electrical tape over it and put the cluster back in. then your check engine light is off. well, not really, but to the naked eye it is. hahhahahahaha

If the check engine light is on there is something wrong,I would highly NOT recommend tapping over the light to hide it.

Plus if the light is covered, in the future you'll have know way of knowing if their is problem before it's to late

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- Mike
'12 JK

Jeep Tech Files

thats what did, come to find out, it as showing a code of P0740 and all it was my tranny was leaking fluid and getting on the speed sensor due to muddin and driving fast i guess. and that was @ 65,XXX, and now i have 104,600 on the dial. all with the tranny fixed, but the sensor apparentlly was still soked with fluid. i did the same thing in my cop car with the air bag light. hit a big ol bump anf the air bag light came on. took the cluster out and put some black elec. tape on it and, whala, all gone. but in a;ll seriousness, check your tranny fluid and see of any of the sensors are wet, that might be the problem

Mine came on, and I stopped and opened the hood , and it was still there, so when I got home I drilled a hole in the clear plastic on the instrument panel and stuck a icepick in the hole and taped it real hard , and the light went out ,problem solved . No seriously i went through the same deal and someone told me to check the gas cap to make sure it sealed , the rubber seal had a tear in it {I have a Locking cap} so I replaced it and it is fine now > try looking at the cap seal .

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2006 Renegade 4x4
Roof Light Bar,
Off-Road Package,
Rock Rails,
Tow Package, Factory Tow Hooks Front.
Rear Hitch Tow Hook,
750 Watt Inverter,
Cobra 25 WX CB Radio W/ a Cobra HG-M75 Power Mic
Cobra 100 Watt CB Magnet Mount Antenna - HG-A1000
Garmin nuvi 265T

Thanks for all your inputs. It's my wife's Liberty never took it off road so there is no mud or any kind of dirt around the sensors. It's lifted with a daystar lift and 255/70/16. I'm going to take it back to the dealer and make them do a relearn on the trans like tjkj2002 suggest and also do a pinion reset. The convertor is locking up at highway speed and like I said it shifts smooth. My 02 Liberty had a speednometer problem several months ago check all the wiring and replaced the rear sp sensor no help did a pinion reset and that fixed it so a relearn might do the trick.

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2002 Liberty
W/Lift+Armor+Diff mods