Error Code P 0122

Discussion in 'General Motoring' started by matthewsgrant, Apr 12, 2005.

  1. matthewsgrant

    matthewsgrant Guest

    Hi,

    I have a 2002 Jeep Grand Cherokee Laredo. Lately, the check engine
    light has been coming on. I ran a diagnostic test (ignition on/off
    on/off on/off on) and it shows the codes P 0122, P 0456. I was able to
    find info on P 0456 (possibly a bad seal on gas cap - gonna check it
    out), but I haven't been able to find anything regarding P 0122. Can
    anyone offer any information as to what this is, and what might cause
    it. Also, any fix information would be greatly appreciated. Thanks!

    Matt
     
    matthewsgrant, Apr 12, 2005
    #1
  2. matthewsgrant

    Russ Guest

    Matt,

    Reference the factory manual for 2000 (should be very similar).

    P0122 - Throttle position sensor input below the acceptable voltage range,
    or APPS voltage input below the minimum acceptable voltage.

    P0456 - Leak has been detected in the evaporative system.

    Russ
     
    Russ, Apr 13, 2005
    #2
  3. matthewsgrant

    Bill Guest

    P0456 is small leak detected. There are three leak fault codes. Small,
    medium P0442, and large P0455. Small leak is the tech's most dreaded fault
    [other than multiple cylinder misfire :) ] It could be the vacuum valve in
    the gas cap. They can accumulate trash and some rust and leak.

    Bill
     
    Bill, Apr 14, 2005
    #3
  4. matthewsgrant

    Scott S. Guest

    122 Throttle position sensor voltage low


    www.ALLPAR.com
    SCOTT
     
    Scott S., Apr 14, 2005
    #4
  5. matthewsgrant

    Bill Guest

    Russ had already covered that one...


     
    Bill, Apr 15, 2005
    #5
  6. matthewsgrant

    mic canic Guest

    it's only a tech worst becuase most customers don't want to pay check out\
     
    mic canic, Apr 16, 2005
    #6
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