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Thread: Limp mode

  1. #1
    SOCM
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    Default Limp mode

    You'll have to excuse me if this has been answered before. I've searched google and can't really find the answer I want and I'm at work and can't spend all day finding my answer. I brought my jeep to a shop "jeep specialist" to get my jeep up and running after my incident with some water damage. They got it running and gave it back to me, I took off and noticed that it was REAL sluggish when I try to mash on the gas, and it won't shift out of 2nd or 3rd gear. I brought it back extremly angry! The guy said that the check engine light must have came on after he test drove it, the error code was P0700. Obviously its something to do with the transmission. He said that its probally just an electrical problem from the water. The jeep had gone into "limp mode" my question is what exactly that is cause from what I read in the manual it explains that when in limp mode the jeep is trying to protect itself from damage so it won't shift out of 3rd. BUT does that explain why it was REAL sluggish moving from a stop? I think my trans is just on it's way out and the guy was just being optimistic. Any help would be awesome!

  2. #2

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    I had this problem in my grand cherokee, not from water though , and it wouldn't get out of 3rd. It's sluggish probably because it's stuck in a higher gear. Think about driving a stick shift and starting out in 3rd. You've got to finesse the clutch. What fixed mine was a new solenoid pack in the tranny to the tune of about $500 for just the solenoids.
    Toy: 01 TJ 4.0L, Auto, Currie HP 9 w/ detroit, 4.56's, 36" TSL radials, RE 3.5 SF, Fenders cut to chit, RE Hack n Tap w/ a Woody



  3. #3
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    If your guy was a "Jeep Specialist", he could tell you what the problem was from the diagnostic code. Transmission failures must be diagnosed using DRB box.

    P0700 EATX Controller DTC Present

    This SBEC III or JTEC DTC indicates that the EATX or Asin controller has an active fault and has illuminated the MIL via a CCD (EATX) or SCI (Aisin) message. The specific fault must be acquired from the EATX via CCD or from the Aisin via ISO-9141.

  4. #4
    SOCM
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    Default

    i know what the code is. I was wondering what exactly "limp mode" is. I've gathered that its a default setting that the trans falls back on when its trying to protect itself from damage. I'm not sure on any specifics.

  5. #5
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    Quote Originally Posted by RangerMed175 View Post
    i know what the code is. I was wondering what exactly "limp mode" is. I've gathered that its a default setting that the trans falls back on when its trying to protect itself from damage. I'm not sure on any specifics.
    You are right about that but it could be for several reasons.
    You really need to get it diagnosed by an expert. The Jeep dealership that I go to has an excellent transmission guy..
    Dang did I just say something good about a dealer??
    Jim
    Otisdog - 2003 TJ Sport

  6. #6
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    Default

    Limp mode is set when the transmission registers certain faults. It is designed to shift into 2nd gear to get you off the road and home and safe when failures occur. Transmission codes must be read by a diagnostic box that the dealership or a transmissin shop will have. My guess is you are in for some bad news. If you got the soleniod pack wet, then that could be your problem and a new one will fix that. If you have water inside your transmission, good luck.

    Disconnect your battery and see if you can clear the codes. This might get you out of limp in mode, but I would suggest you also check with a professional.

  7. #7

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    my 04 rubi went into limp mode when I tested the snorkle in a pond. Pull the trans control unit (under hood on top of the drives side wheel well) clean the connections with contact cleaner and coat them in di-electric grease and reconect them. then do the same on the connections on the trans. go to an auto-zone or anyplace that will let you use a scan/reset tool. reset the computer, and you should be good. I had to do the reset 4 times but it finaly dried out. When I was in limp mode I had to drive 170 miles back from where we wheel. You can run it up to 40mph in limp mode put it in nuetral, turn off the key and roll down the street, then start it back up while rolling and it will shift to third gear because of the speed of the rolling wheels and will stay there until it needs to downshift. That should get you through until it dries out.
    2004 Electric Lime Green Rubicon
    Lift,Winch,JKS,Rokmen'd,BFG'd,Other stuff.

  8. #8

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    To the OP


    What are you driving?

  9. #9
    Registered cherokee980's Avatar
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    Default

    Well my friend, I am going through the same exact thing. I too thought transmission was bad, and I went so far as to REPLACE my transmission. I then later found out that I was also in limp mode because of P0700 (Trensmission control module malfunction). I have since purchased a new ECM (on the '05 TJ the TCM is built into the ECM). I am waiting for it to come in to see if that fixes my problem. So far I am about $1,100 deep into this, and still do not have it fixed.
    I am always monkeying around with something!

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