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Thread: CHECK ENGINE CODES : 2007-Up Jeep JK Wrangler

  1. #61
    Fresh Catch RKJK10's Avatar
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    Cleaned my throttle body the other day. Which was nasty. Took it for a test drive and the jeep went into limp mode. P2112, P2110, P0401 and P121c, unplugged the battery and it went away. But keeps coming back. Bad throttle body?
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  2. #62
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by RKJK10 View Post
    Cleaned my throttle body the other day. Which was nasty. Took it for a test drive and the jeep went into limp mode. P2112, P2110, P0401 and P121c, unplugged the battery and it went away. But keeps coming back. Bad throttle body?
    Did you prop the throttle body open with the key on by chance when you cleaned it?
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  3. #63
    Fresh Catch RKJK10's Avatar
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    Quote Originally Posted by cozdude View Post
    Did you prop the throttle body open with the key on by chance when you cleaned it?
    No I took it off the motor, cleaned it and reinstalled it


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  4. #64
    Fresh Catch RKJK10's Avatar
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    Quote Originally Posted by RKJK10 View Post
    Cleaned my throttle body the other day. Which was nasty. Took it for a test drive and the jeep went into limp mode. P2112, P2110, P0401 and P121c, unplugged the battery and it went away. But keeps coming back. Bad throttle body?
    My assumption was right. Changed the throttle body and she runs perfect!


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  5. #65
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    P0128 and P2181

    All,
    I have a 2008 Jeep Wrangler JKU:
    6-speed manual; Dana-60 axles (5.38 ratio); 4-inch lift kit; 38-12.5r17 tires; Pypes Cat-back off-road exhaust; and OEM air intake (running K&N reusable air filter) – 125K miles on vehicle and stock motor. 12K winch is buried in SRC Pre-runner bumper – so no airflow restrictions.
    Operating temps have never, ever been an issue – until I recently towed a trailer in highway summer conditions (100 degree ambient air) on Baker, CA grade (east and west bound), as well as, eastbound up to St George and beyond on I-15. Trailer is 2-axle , 14-foot enclosed - with 1000 lbs Harley as load (approx. 4500 lbs gross weight). Also, in idling/crawling in SW desert conditions – where fan stays on for extended periods of time in Lo-4.
    In an attempt to improve the cooling system – using OEM only parts they offer in Middle Eastern countries for JKs, I have added the mechanical fan shroud, thermostatic fan clutch, and fan blade – which are installed over a stock electrical fan and slightly modified electric fan shroud (trimmed to fit inside new mechanical shroud and mount to same mounting points) as additional capacity during projected high heat events.
    In the four days since I’ve had this new setup installed (Jun 24th), I have tripped P0128 and P2181 codes three times.
    I replaced original coolant, hoses and thermostat (195 degree) with OEM parts one month (May 20th) before I pulled the trailer in summer conditions (2017 Memorial Day weekend – Baker, CA registered 103 degrees at 1pm when I past westbound on I-15). Have had absolutely no faults in the life of this vehicle (guess they don’t make them like this anymore, eh?)
    I am not having an overheat issue, rather, it runs 30+ degrees cooler without any trailer loads – approx. 160 degrees on OBD scanner. If I let the jeep idle for over an hour, it will finally reach OEM operating temp (190+), and then cools right back down to approx. 160-170 when rolling 25+mph . I don’t get a code trip when I do that. It’s during cold starts in morning on commute to work, or, short trips to market when vehicle is not allowed to warm-up that the codes trip.
    Can the ECM be sufficiently remapped to eliminate these code-tripping conditions?
    Can I get a different Coolant Temp Sensor that tricks the ECM? Can I drill a bleed hole that directly hits the sensor tip?
    Can I get a different thermostat that keeps the Coolant Temp Sensor reading the actual hot engine temps? (bleed-hole type, or, larger bleed-hole)
    Does the electric fan switch also provide input to the ECM that would require relocation of the sensor to a location other than on the mechanical fan shroud (the electric fan shroud had the sensor less than 1-inch from radiator fins – new mechanical shroud has it almost 3-inches away from the radiator fins)? The mechanical fan interfered with leaving the sensor in the original location on the electrical fan…
    This setup is absolutely awesome, and, FCA (then Mercedes) should have told the US EPA to go pound sand when they were forced to remove the dual mechanical/electrical fan setup for US consumer usage, but they didn’t.
    What mods do I need to do to make this vehicle stop reporting such ‘false failure’ conditions?

  6. #66
    Meme King WJCO's Avatar
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    Quote Originally Posted by lordlochwood View Post
    All,
    I have a 2008 Jeep Wrangler JKU:
    6-speed manual.........................................
    What mods do I need to do to make this vehicle stop reporting such ‘false failure’ conditions?
    Sounds like you've nailed down the cause. I would assume the ECM is indeed triggering the code due to the vehicle running too cool. If I were in your shoes, I would talk to a shop foreman or a helpful service writer at a local dealer and see if there is any reprogramming they can do. The only other thing that I think you could do, but may require some trial/error work is to wire a resistor in between the ECT sensor and ECM to trick the computer into thinking that it's receiving the right signal. Only issue with this would be when it's warmer, it may think the vehicle is overheating. Kind of a tricky issue. Other than the code, are there any other abnormal symptoms?
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  7. #67
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    P0404 - Egr Position Sensor Rationality Open Wrangler jk 2007

    P0404 - Egr Position Sensor Rationality Open
    Please help me with image the location of this part

    Thanks

  8. #68
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    P0522 - Engine Oil Pressure Too Low

    Wrnagler 3.8 2007
    Showing this alert
    Please help me with image

    Thanks

  9. #69
    Been Around the Block Bierpower's Avatar
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    Quote Originally Posted by Hasan albouz View Post
    P0404 - Egr Position Sensor Rationality Open
    Please help me with image the location of this part

    Thanks
    IMG_20190525_100914.jpg

    https://wayalife.com/showthread.php?t=53935

  10. #70
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    Egr

    What is the exactly the issue ..!? Please help

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